Radar system for headway control of a vehicle

3~gl A ~adar System for Headway ~ontrol of a Vehicle Bac~grou~d of the Invention This application is a division of application Serial No. 512,788 filed June 30, 1986, the invention relating to a radar system for headway control of a vehicle.

Many radar systems for the prevention of venicular collisions with objects in the path of travel of the vehicle have been designed and to a large extent have been moderately successful in warning the driver or automatically braking the vehicle to prevent collisions or deploying air bays when collisions were imminent. Prior art systems have a num~er of problems when collisions are imminent, among which are the detection of and reaction to non-hazardous targets, the failure to instantaneously vary the activation level of the radar produced signals with varying changes in vehicle conditions, to inactivate or activate air bag deployment systems under certain vehicle conditions and providing input signals relative thereto into the system for proper evaluations for necessary vehicle response and/or air bag deployment. The radar system of this invention is directed towards the solution of these and other problems.

l~t~3791 Summary of tle Invention ___ __.

The present invention consists of a radar system for headway control of a vetlicle, the system comprising in combination, an FM-CW radar including means for producing signals respectively representing the range and closing rate between the vehicle and an object, means for producing signals representing certain vehicle conditions including the speed, steering, acceleeation and declaration of the vehicle, means for summing all of said signals into a single signal representing the actual hazard level between the vehicle and the object, means for producing a reference signal representing a predetermined reference hazard level derived from summing weighted values of the range, closing rate and vehicle conditions, and means for producing a signal when the actual hazard level exceeds the reference hazard level.

These and other features of the present invention will become more apparent from the following description of an embodiment thereof taken in conjunction with the accompanying drawings wherein:

1~93791 Brief Description of the Drawings . _ _ _ _ _ Fig. 1 is a block diagram of the invention showing the central unit, various inputs thereto, outputs therefrom and monitors, Fig. 2 depicts the relative positions of Figs. 2A, 2B, 2C and 2D;

Figs. 2A, 2B, 2C and 2D represent a detailed block diagram of Fig. l;

Fig. 3 is a block diagram of the power supplies of the invention;

Fig. 4 depicts the relative positions of Figs. 4A and 4B;

3'7~31 Figs. 4A and 4B are detailed block diagrams oE the drive monitor circuit of Figs. 1 and 2;

Fig. 5 depicts the relative positions of Figs 5A, 5B, 5C and SD;

Figs. 5A, 5B, 5C and 5D are detailed schematic showings of the pre-amp/modulator circuit of Figs. 2A, 2B, 2C and 2D;

Fig. 6 depicts the relative positions of Figs. 6A, 6C and 6D;

Figs. 6A, 6B, 6C and 6D are detailed schematic showings of the signal conditions of Figs. 2A, 2B, 2C and 2D;

Fig. 7 depicts the relative positions of Figs. 7A and 7B;

Fig 7A and 7B are detailed schematic showings of the drive monitor circuit of Figs 4A and 4B;

Fig. ~ is a plan view oE the turn switch of the invention;

Fig. 9 is the electrical schematic of the turn switch circuit;

Fig. 10 is a schematic showing of the pendulum and associated switch of the invention;

Fig. 11 is a graphic showing of the operation of the invention under varying conditions and relationships; and Fig. 12 is a graphic showing of the ambiguous reflected signals rejected by the receiver of the system.

~'Z93'~ Detailed Description of the Drawinqs Referring now to the various drawing Figures wherein the same reference numeral i5 used to depict the same or like element and the various arrow heads indicate signal flow in the various circuit diagrams. The following is a list of circuit designators used to identify the application of the various components throughout the description:

A = Amplifier and Diplex Channels B = Log - Amp and Threshold Circuits C = Capacitors D = Doppler Speed Channel and Circuits E = Directional Doppler F = Air-Bag Signal Strength Circuits G = Air-Bag Doppler Circuits H = Air-Bag Range Circuits I = Metering and Indicating Devices J = Sensor and Switch Inputs K = Range Channel and Circuits L = Inductors M = Diplex Generator and Modulator Circuits N = Driver-Monitor "Sum" Circuits O = NOT USED P = DC "Power-Down" Circuit Q = Transistors R = Resistors S = Vehicle Speed Channel and Circuits T = Tone Generator and Power Amp Circuits U = Integrated Circuits V = Main Radar "Sum" Circuits W = Warning "Level" Circuit X = Caution "Level" Circuit Y = Braking "Level" Circuit Z = Air-Bag "Sum" Circuits and Switches A A Pendulum Circuits J4 ~ B ~ Braking Input Circuit J5 C C = Carburetor Vacuum Circuit J6 D D = Steering Angle Input Circuits J7 E E = "Look-Ahead" Circuit F F = "l~igh-Speed" Turn Circuits G G = "Driver Under Control" Circuit H H - "Slow-Speed" Modieier Circuit R A = Long-Range Circuits Centrally located in the Fig. 1 showing is the main control unit 20 which is mounted at a convenient location in the interior of the vehicle (not shown). The main control unit 20 receives signals and transmits signals according to the direction of the arrow heads on the interconnecting lines therefrom. On the left hand side of 1~93~ the Fig. 1, the external mounted portion 22 of the system is shown which is generally located at the front most of the vehicle. This unit 22 includes a micro~ave antenna which is shock mounted to the vehicle by use of a shock absorbing medium such as, rubber or thelike to isolate any vehicle vibration from the ante1lna, a microwave transceiver, a low-noise amplifier and the diplex generator with its respective modulator and demodulator circuits. As shown by the interconnecting lines to the main control unit 20, a radar object reflection signal is received by the main control unit from the outside unit 22. A threshold control signal B16 from the main control unit is transmitted through interconnecting lines to the outside unit as it is a 12 volt D.C. operating voltage.

The outside unit is connected to a common system ground.

The external inputs to the main control unit are shown on the upper central portion of the Figure. The 12 volt D.C. source 20 is supplied to the main control unit, as is the car speed taken from the cruise control 158 or a like pickup (not shown), as well as the vehicle operator traffic condition manual input Jl and the driving monitor inputs, hereinafter discussed in more detail. Positioned on the Figure below the main control unit are shown some visual indicators interconnected to the main control unit for supplying information thereto. The indicator 32 is the cruise control setting, the indicator 34 is the audio warning which includes tones, warr-ing lights 36, control deacceleration for the brakes 3~, and an air bag energize/deenergize switch ~0.

On Fig. 1 at the right hand side of the main control unit 20 are a plurality of interconnectillg lines to the monitor console 42 and to meters located within the vehicle 12~379~ for monitoring the entire system. The monitoring console 42 is supplied with input signal Vl indicating the safe/danger levels, the range K7 in feet (0-250'), the car closing rate D5 to a dangerous object in MPH or feet per second, the car speed S6 in miles per hour or feet per second, tlle signal strength B12, a requlated positive 8 volts D.C. source, a regulated 5 volts D.C. source, a sync strobe signal and a regulated minus 8 volts D.C. source. The reason for these monitors will be hereinafter explained in more detail.

Further, there are available outputs from the monitor console 42 to supply signals for a data recorder if desired and a video monltoring device.

Referring now specifically to Figs. 2A, 28, 2C and 2D.

These figs., comblned as shown in Fig. 2, are a detailed block diagram showing of the entire collision radar system of the instant invention. A microwave antenna 48 which transmits a dual-diplexed radar signal forward of the vehicle and also recelves the return signals. The antenna which is rotatably positionable in a manner hereafter described is interconnected to a coupler or circulator 49 through line 50 which relays signals in both directions. Power to the antenna 48 is fed through the circulator or coupler 49 is supplied by a gunn diode transmitter 58 and interconnected circuit which includes a system clock 52 (Ul, Q4), a dual diplex generator 54 (U2-U6), a gunn diode modulator S6, (Q5 and Q6), a directional coupler 60, and an RF load 62. The object reflection signal received from the antenna 48 is fed through the coupler 49 to a shockley diode receiver 64 which produces an output signal A which provides an input signal to a low noise pre-amplifier 66 (U8). The output signal ~4 from the low noise pre-amplifier 66 is routed to the inp~t of a low lZ~3791 pass filter 68. The output signal ~ from low pass filter 58 provides an input to a log-linear converter 70 (Q7, Q8, Q9, Q10 and Qll~ the output signal therefrom B8 provides an input signal to a D.C. offset amplifier 72 (U21A) the output signal B10 therefrom provides an input signal to a D.C., amplifier 74 (U21B) the output signal B12 provides an input to a threshold detector 76 (Q12, Q13 ~nd Q14) its output B16 provides inputs to a logic buffer 78 (U22) the input signal and dual duplex generator 54 to a logic sensor 80 (U23), which has two output signal paths Bl9 and B19A.

B19A is connected to a loss signal indicator 82. Bl9 is connected to a common connection between a short range hold switch 84 (U33A) and a second hold switch Doppler 86 (U33B).

Output signal B10 hereinafter mentioned also provides an input to a signal strength D.C. amplifier 88 (U39A). Output signal B21 from the threshold detector 76 is connected to one input o a range slope inverter 90 (Q27) and to on input of a long range ~lope inverter 92 (Q16). An output signal K from Q27 provides an input to integrator range 85 (U36C) and hold switch 84 tU33A). The output H3 of integrator range 85 provides an input to D.C.

range offset amplifier 87 (U36D, U38D~.

The signal A4 is urther connected to de-modulator switches 94, 96, 98, 100 (U7A-U7D), and provides four separate channels (A5-ASC). The dual diplex generator 54 (U2-U6) feeds timing pulses (M9, M10, M13, and M14) to their respective de-modulator switches (U7A,B,C, and D).

The circuits providing signals AS to A17 are identical or, all four channels. Following only one channel for ease of explanation, signal A5 is connected to a low pass filter 1~93~91 102A (Ull), and also receives a timing signal M3 from the system clock 52 (Ul, Q4).

This timin~3 si~nal is also applied to the other lo~ pass filters 102D-102B (U9, U10, Ull and U12).

Output sigllal A6 from Ull is applied to the compressor amp 104A (U131t and U1411~). The output 1~9 from U13 and U14 is appliecl to the input of amplifier 106A (U17A).

The output signal A14 Lrom U:1.7A supplies an input signal to squaring amp lO~A (U18~ and U18B).

The output signal A17 from the squaring amplifier (U18A and B) provides an input signal to channel 1 short range phase detector 110, and one input to the directional Doppler detector 112 (U24, U25, and Q15). 1~ second signal A17A from compressor amp 104B (U13B, U17B), amp 106B (U17B) and squaring amp 108B (U18C, U18D). Amp 108B provides a second input to the directional Doppler detector 112 and is also fed to channel 2 short range phase detector 114.

The output of the directional Doppler detector 112 provides a directional doppler signal E4.

Signals A17B and A17C, compressor amp 104C (U15A, U16A), amp 106C (U19A) and squaring amp (U20A, U20B) and compressor amp 104D (U15B, U16B), amp 106D (Ul91~) and squaring amp 108D (U20C, U20D) respectfully are applied to the long range phase detector 116. A second output 1~17D from amp. 108B provides a Doppler signal.

Output signal KA is connected to the long range slope inverter 92 (Q16) ~hich also has an input B21 from the threshold detector 76 (Q12, 13 and 14 described earlier).

Signal KA2 the output from Q16, is applied to the long range integrator 118 (U27A) and the output KA4 from U27A provides an input to the long range comparator 120 (U27B and Q17). The output K4 from comparator 120 is the range disable signal.

The signal ~17D from Arnp lO~B is connected to the input of Doppler frequency/analog converter 122 (U35A) the 1~379~ output D therefrom provides an input to hold switch 86 (U33B).

The output D also provides an input to the integrator Doppler 124 (U36A).

The output G2 from the Doppler int~grator 124 is connected to the input of a Doppler D.C. amplifier 126 (U36B), the output G5 from D.C amplifier 126 provides inputs to a Doppler buffer amplifier 128 (U38A) and the Doppler threshold comparator 130 (U38C).

The output of Doppler amplifier buffer 128 provides one input G6A to the air bag summing amplifier 132 (U38B).

The output of the Doppler threshold comparator 130 and HS DC from offset and range amplifier 87 provide second and third inputs to the air bag summing amplifier 132 (U39B) .

The output Zl from amplifier 132 provides an input to air bag comparator 134 (U40D) .

The output Z3 f rom the air bag comparator 134 takes two paths, one path provides an input to an air bag tone switch 136 (Q34) and the other provides one input to an air bag power switch 138 (Q33), the output Z7 from the air bag power switch 138 provides an input signal Z7 to convenient air bag deploying mechanism (not shown).

The air bag tone switch 136 provides an input Z6 to a tone generator 142 (U41). The output Tl from the tone generator provides an input to audio power amplifier 143 (U42), the output of 143 T3, is connected to an 8 ohm speaker (not shown).

The output K from the range slope inverter 90 (Q27) provides an input to the hold switch 84 and to intergrator range switch 85 (U36C).

The output Kl from the hold level switch 84 (U33A) provides an input to a range integrator circuit 144 (U34A).

The output K4 frorn the range integrator circuit 144 provides the input to the D.C.

offset and range amplifier circuit 146 (U34B and U37A) which also receives a second range disable input signal K4 1~937'~1 from the comparator 120. The output K7 of the D.C. offset and range amplifier 146 provides an input to a main summing amplifier 148 (U37D), The output from hold switch 86 provides an input Dl to a Doppler integrating circuit 152 (U34C). The output D4 from circuit 152 supplies an input to a D.C.

Doppler amplifier 154 (U37B). The output D5 fcom the amplifier 154 provides a second input to the main summing amplifier 148.

The inputs to a speed frequency to analog converter 156 (U35~ is provided from an automobile speed transducer (not shown) and typical of those used with conventional speed controllers of the magnetic pickup drive shaft mounted type. The output S2 from the speed frequency to analog converter 156 provides an input to the speed integrator circuit 160 ~U35D~. The output S4 from the speed integrator provides an input to D.C. amplifier speed circuit 162 (U37C), inputs to compatator high speed 164 (U48A), inverted speed 166 and slow speed modifier 170 (U47C, U47D).

The output S6 from amplifier 162 provides a third input to the main summing amplifier 148 (U37D).

The output V2 from the main sum amplifier 148 takes two paths.

One path is to a warning comparator 172 (U40A).

The output Wl of warning comparator 172 is connected to a tone generator power switch 174 (Q28 and Q29). The output W4 from the tone generator power switch 174 supplies DC power to the tone generator 142 ~U41). The second path of output V2 provides an input to the caution comparator 176 (U40B). The output Xl o~ the caution comparator provides an input to a caution tone switch 178 (Q30). The output X3 from the caution tone switch 178 is connected to the tone 12 lZ937~ qenerator 142.

A second output Vl from the main summing amplifier 148 provides an input to a brake comparator circuit 180 (U40C). The output Yl from brake comparator 180 takes three paths; one path is to a brake tone switch 181 (Q31), the output Y3 of bake tone switch 181 is connected to tone generator 142. ~nother path of output Yl provides an input to the driver monitor sum modifier 150 (Q43). The other output Yl of the brake comparator circuit 180 provides an input to a brake power switch 182 (Q32). The output Y5 from the brake power switch 182 is applied directly to the brakiny control circuits. The brake control circuits connect the electric output signal Y5 to vehicle braking means not shown.

Referring now again to the tone generator 142. As aforementioned, the output Tl of the tone generator provides an input to audio power amplifier 143 (U42), the output T3 of U42 is connected to the speaker (as hereinbefore discussed) so that the operator of the vehicle receives an audio warning.

The output Pl from the signal strength D.C. amplifier 88 provides an input to a signal strength comparator and switch 184 (U39B), the output F3 from ln4 is connected to the input of an air bag disable switch 186 (Q36, Q39C).

The output Z4 of the air bag disable switch 186 and the output from power up air bag control 190 (Q35) provide an input to the air bag power switch 138 (Q33).

The switch 186 is connected to a 12VDC power source hereinafter discussed and switch 190 is connected to a 8VDC source.

1~?3'~1 The output F~3 of the vehicle speed inverter 166 provides one input to a high speed enable switch 192 (U49A).

The second input YF2A to the high speed enable switch 192 is provided from thc output of the high speed comparator 164. The output FF4 from switch 192 urovides an input to a turnins enable switch 194 (U49B). The output FF5 from the turning enable switch 194 provides one input to driver monitor sum amplifier 196 (U47A). The output FF2A from compatator high speed 164 is also connected as the input to enable low speed switch 19~ (Q42).

The output FP4A from output enable switch 19~ provides an input to a low speed steering angle switch 200 (U49C).

An Inverted Turning Circuit 202 IU48D) receives its input signal DD from a switch assembly hereinafter discussed operated by the vehicle steering linkage. The output DD is also supplied to the turn comparator 204 (U48C). The output DDlA of the turn comparator 204 takes two paths; one path to a second input of the turning enable switch 194 and the second path provides an input to the inverted turn circuit 206 (U50A, U50B).

The output DD2 of the circuit 20' provides an input to the low speed turning switch 200. Output signal DD4 from switch 200 provides another input to signal amp. 196.

The conventional vehicle brake lamp switch (not shown) when closed provides a +12V signal input BB to driver control logic 20~ (U50D), to slow speed modifier 170 (U47C, U47D) and to inverted brake circuit 20~ (U50C).

The output BB2 from circuit 209 provides one input to look ahead logic 210. A second input to logic 210 is provided from output DD 3A from switch 206.

Tl)e output G~2 from the logic 20 provides another input to sum amp 196.

1~2"33'~ The vehicle intake manifold vacuum switch either supplies a +12V or OV signal input CC to the Logic 208, to modifier 170 and to look ahead logic circuit 210 (U51).

The output EE2 of logic 210 and the output signal HH5 from modifier 170 provides additional input to sum amp 196.

A signal AA from a pendulum switch, hereinafter discussed, provides an input to pendulum logic 212 (U47B, Q44).

The Output Signal AA4 from 212 provides an input to sum amp 196.

The output V of the sum amp 196 is connected to an input of the main summing amplifier 148.

Output N from Disable 150 provides another input to sum amp 196.

Referring now to Fig. 3, the main control unit 20 provides a source of switched 12V DC voltage from the battery of the vehicle.

This source provides an input to power a +lOV DC regulated supply 214 (Ql, Q2, Q3), a +8V DC regulated power supply 216 (U52), a +5V DC power supply 218 (U53) and a DC-DC converter 220 (U54). The DC-DC convertor provides a power source for a 8V regulated DC power supply 222 ~U55).

Referring now to Figs. 4A and 4B.

These combined Figs. as shown in Fig. 4 are a detailed block diagram of the front end circuit of Fig. 2.

Beginning at mixer diode input point A (reference Mixer Diode) on the righthand side of ,Fig. 4A, the center lead of a shielded wire is connected to one side of capacitor Cl9 of .47 microfarads and through resistor R29 of 1.5K ohms to ground.

The outer shield of the shield wire is connected directly to ground.

The other end of capacitor Cl9 is lZ~37~1 connected to one end of resistor R28 of 5.11K ohms and through capacitor C20 of .47 microfarads to line ~1 which connects to terminal 3 of pre-amp U8A and to one end of a resistor R27 of lOK ohms. The other end of R28 is connected to both terminals 1 and 2 A2 of U8A and to one end of resistor R25 of lK ohms. Terminal 4 of U8A is connected to ground. The other end of R27 is connected to the positive 5 volt bias line, the positive end of capacitor C21 of 22 microfarads, terminal 6 on each of low pass filters U9, U10, Ull and V12, one end of the following resistors, R26 of lOK ohms, R23 of lOK ohms, R24 of lK ohms, R30 of lK ohms, R31 of lK ohms, R32 of lK ohms and R33 of lK ohms. The other ends of both C21 and R26 are connected to ground. The other end of R23 is connected to the positive 10 volt line, terminal 8 of pre-amp U8B and through a capacitor C15 of .01 microfarads to ground. The other end of R24 is connected to terminal 5 of amplifier U8B.

The other end of R25 A3 is connected to one end of resistor R22 of lOK ohms and to terminal 6 of U8B. The other end of R22 is connected to the following terminal 7 of U8~, terminals 2, 3, 9 and 10 of dual diplex demodulator U7 and the center lead of log amp shielded output A4.

The Guter shield of A4 is connected to ground.

16 125~3791 Beginning now at circuit point M in the lower left hand corner of Fig. 4B, terminal 5 of system clock Ul is connected to one end of capacitor C7 of .001 microfarads and to the wiper of potentiometer resistor R7 of lOK ohms.

The other end of C7 is connected to terminal 6 of Ul and to one end of resistor R9 of 2.21K ohms. The other end of resistor R9 is connected to the following, one end of resistor R6 of 3.32K ohms, one end of resistor R10 of lK ohms, the emitter of transistor Q4, the positive 10 volt line, terminal ~ of Ul and one end of capacitor C9 of .01 microfarads. The other end of C9 is connected to ground.

The other end of R6 is connectecl in series with resistors R7 and R3 of 33.2K ohms to ground. Terminal 7 of Ul is connected through capacitor C~ of 470 uicofarads to ground.

Terminal 1 of Ul is connected directly to ground. The other end of R10 is connected to one end of resistor Rll of 3.01K ohms and to the ~ase oE Q4 at signal reference M2.

The other end of Rll is connected to terminal 3 of Ul Ml.

The collector o~ Q4 is connected through resistor 1~12 of lK ohms to ground to terminal 3 of qate generator U2 and to terminal 1 of U9, U10, Ull and U12. Terminals 2 and 5 of U2 are connected together. Terminals 4, 6, 7, 3 and 10 of U2 are all connected to ground. Terminals 9 and 12 signal M4B of U2 are both connecte~ to one end of resistor ~34 of 5.62K ohms to terminal 9 of channel 2 control U4 and to terminal 1 of dual diplex driver U3. Terminal 13 of U2 signal M4A is connected to terminal 13 of U3 and to terminal 5 of U4 and to one end of resistor 1135 of 5.62 ohms. Terminals 1 and 11 of U2 signal M4, and terminals 5 and 6 of U3 are inter connected~ Terminal 14 of U2 is connected through capacitor C10 of .1 microfarads to ground and to the positive 10 volt line. Also connected to the 1~37~1 positive 10 volt line is one end o~ each of the following:

the positive end of capacitor C4 of 47 microfarads, the positive end of capacitor C3 of 2.2 microfarads, the anode of diode CR2, one end of resistor ~4 of 511 ohms and the collector of transistor Ql. The other end of C4 is connected to ground, the other end of C3 is connected to the anode of diode CR3, one end of resistor R5 of 100 ohms and to the base of transistor Q3. The cathode of CR3 is connected to the cathode of C~2. The emitter of Q3 and the remaining end of RS are connected to ground. The other end of R4 is connected to the anode of diode CRl. The cathode of CRl is connected to one end of resistor Rl of 47R ohms, to one end of capacitor C2 of .1 microfarads and to both the collector of Q3 and the base of transistor Q2. The emitter of Q2 is connected to one end of resistor R3 of 47 ohms. The other end of ~3 and C2 are connected to ground.

The collector of Q2 is connected through resistor R2 of 180 ohm~ to the base of transistor Ql. The emitter of Ql is connected, along with the positive end of capacitor Cl of 2.2 microfarads and the other end of Rl, to the positive 12 volt DC. The other side of Cl is connected to ground.

Continuing now with the connections to U3, terminal 14 is connected to the positive ends of both capacitors C6 of 22 microfarad~ and CS of .01 microfarads and to the positive 10 volt line. The other ends of CS and C6 are connected to ground. Terminal 3 of U3 sig~al M6 is connected through resistor R14 of l.SK ohms to the base of transistor Q5.

Terminal 11 of U3 signal M6A is connected thro~gh resistor R15 of l.SK ohms to the base of transistor Q6.

The emitters of both Q5 and Q6 are connected to 18 12~l37~31 Terminal 14 of U6 is connected through capacitor C13 o~ .01 microfarads to ground and to the positive 10 volt line.

Terminals 7 of U5, U6 and U7 are all connected to ground.

Terminal 1 of U6, signal M13 is connected to terminal 6 of U7, and terminal 13, signal M14, is connected to terminal 5 of U7. Terminal 11 of U6 is connected to the other end of R35. Terminal 14 of U7 is connected through capacitor C14 of .01 microfarads to ground and to the positive 10 volt line.

Terminal 4 of U7 signal A5B is connected to terminal 8 of U10 and to the other end of R31. Terminal 1 of U7, signal A5C, is connected to terminal 8 of U9 and to the other end of R30. Terminal 8 of U7, signal A5 is connected to terminal 8 of Ull and to the other end of R32. Terminal 11 of U7, signal A5A, is connected to terminal 8 of U12 and to the other end of ~33. Terminal 5 of U9, signal A6C, is connected to long range channel 2 output. Terminal 7 of U9 is connected through capacitor C16 of .1 microearads to ground and to the positive 10 volt line.

Terminals 3 and 4 of U9, U10, ~11 and U12 are connected to ground. Terminal 7 of U10 is connected through capacitor C17 of .1 microfarads to ground and to the positive 10 volt line. Terminal 7 of Ull is connected through capacitor C18 of .1 micro~arads to ground and to the positive 10 volt line. Terminal 7 of U12 i9 connected through capacitor C22 o~ .1 microfarads to ground and to the positive 10 volt line. Terminal 5 of U10, signal A6B, is connected to the long range channel 1 ol~tp~t. Terminal S of Ull, ~ignal AS, is connected to the short range 12~37~1 channel 1 output. Terminal 5 of U12, signal A6A, is connected to the short range channel 2 output. The outer shields of outputs A6, A6A, A68 and A6C are connected to ground. The anode of CR4 is connected to threshold output signal B16.

Referring now specifically Figs. 6A, 6B, 6C and 6D which are a schematic showing of the signal conditioning circuit of Figs. 2A and 28. These Figs are combined as shown in Fig. 6. The input A4, the output of the preamplifier 66 and is connected to Ll, an inductor of 2.2 milli henries the output of Ll is connected through a .1 microfarad capacitor C26 to ground potential and through a second series 2.2 milli henry inductor L2. The output of the inductor L2, signal B, is connected through a .047 microfarad capacitor C27 and through resistor R189 of 470 ohms to ground potential and through a capacitor C29 of 10 microfarads. The output end of C29, signal Bl is connected to the base of transistor Q7.

The base of Q7 is connected to resistor Rl90 of 5.1K ohms. The emitter of transistor Q4 is connected to ground potential through a 22 microfarad capacitor C30 and to one end of a 5.11K ohm resistor Rl91. The other end of the resistor R191 is connected to a capacitor C28 of 22 microfarads. The other side of C2~ is connected to ground potential. The resistor Rl91 is also connected through a 47 ohm resistor ~42 to the emitter of transistor Qll. Also connected at one end to a point electrically common to the Rl91 side of R42, is a resistor R194 of 5.1R ohms, resister R37 of 5.11K ohms, resistor R~0 of 5.11K ohms and a capacitor C36 of .01 microfarad. The other end of capacitor C36 is connected to ground potential. The collector oE transistor Q7, signal ~t37~31 B2, is connected through a 5.11 K ohm resistor R192, through a capacitor C31 of .001 microfarads to ground potential and to the positive side of oapacitor C32 of 10 rnicrofarads. The negative side of capacitor C32 is connected to the base of transistor Q8, signal B3.

Also connected to the base of transistor Q8 is resistor R193 of 5.11K ohms. The emitter of transistor Q8 is connected through capacitor C33 of 22 microfarads to ground potential and to the other side of resistor R194. The collector of transistor Q~, signal B4, is connected through resister R36 of 5.11K ohms and through capacitor C34 of .001 microfarads to ground potential. Collector of transistor Q8 is also connected to the positive side of capacitor C35 of 10 microfarads~ The opposite side of capacitor C35, signal B5, is connected to one side of R188 of 5.11K ohms and to the base of transistor Q9. The emitter of transistor Q9 is connected to ground through a capacitor C37 of 22 microfarads and to the other end of resistor n37. The collector of Q9, signal B6, is connected to ground potential through a 5.11K resistor R38 and a parallel capacitor C38 of .001 microfarads. The collector of transistor Q9 is also connected to the positive side of capacitor C39 of 10 microfarads. The negative side of capacitor C39, signal B7, is connected to the base of transistor Q10 and to one end of resistor ~39 of S.llK ohms. The emitter of transistor Q10 is connected ~o ground potential through capacitor C40 of 22 microfarads and to the opposite end of resistor R40. The coll~ctor of transistor Q10 is connected to ground potential through resistor R~l of 5.11K ohms and parallel capacitor C41 of .001 microfarads. The other end of resistors 1'190, R93, lZ5~3~ R188 and R39 are connected to a common signal line designated as Bs. A ca~acitor C42 of 4.7 microfarads is connected from this common line B~ to ground potential.

Connected in series with the parallel resistors and capacitors connected to common line as is a resistor R45 of 100 ohms.

Referring now to transistor Qll, the emitter is connected to the other side of resistor R42. The base is connected through two series diodes, CR5 and CR6, through a potentiometer resistor R43 of 500 ohms operating as a voltage divider. The other end of resistor R43 is connected to ground potential. Also connected to the base of transistor Q8 is the positive side of capacitor C43 of 22 microfarads. The negative side of C43 is connected to ground potential. Additionally connected to the base of transistor Qll is resistor R44 of 3K ohms. The end of resistor ~44 is connected to the collector of Qll and to the positive 8 volt regulated supply.

' One end of resistor R53 of 7.5K ohms is connected to the positive 8 volt D.C. regulated power supply and the other end to one side of potentiometer resistor R49 of 500 ohms. The other side of the potentiometer resistor R49 is connected to ground potential. The wiper of the potentiometer R49 is connected through a resistor R4~ of lK ohms to terminal 2 of the inverting operational amplifier U21A and also through R47 of 1~ ohms to the output pin 1 of operational amplifier 72.

Capàcitor C44 of 22 microfarads is connected across potentiometer R49.

lZ~3~791 The output terminal 1, signal B10, of operational amplifier U21A is connected through a resistor R50 of lK ohm~ to terminal 5 of operational amp]ifier U21B.

Terminal 6 of operational amplifier 74 takes two paths, one path is through resistor R51 of lK ohms to ground potential and the other path through tlle feed back circuit which ties through a resistor R52 of lOOK ohms to the terminal 7, signal B12, of operational amplifier V21B and also in parallel across a resistor R52 of lOOK ohms is a capacitor C124 of .18 microfarads. A capacitor C46 of .01 microfarads is connected to the 8V DC at one end and the other end to ground potential. Referring again to operational amplifier U21B. The terminal 8 of operational amplieier is connected to +8V DC. Terminal 4 is connected to the -8V DC and also through a capacitor C45 of .01 microfarads, to ground potential.

Signal B12 from terminal 7 of operational amplifier U21B is connected to one side of resistor R54 of 3K ohms and through a potentiometer R55 of lOK ohms to ground potential. The wiper of resistor R55 is connected to one side of indicator I7, the opposite side of the indicator I7 is tied to ground potential. The opposite side of resistor R54, signal B13, is connected to the cathode of diode CR7 and to the base of transistor Q12. The collector of transistor Q12, signal B14, is connected through resistor R56 of 5.11R ohms to the +8 volt DC regulated power supply 188 and also through resistor R58 of lOK ohms to the base of transistor Q13, sisnal ~16, through resistor. The emitter of transistor Q13 is also connected directly to the +8 volt DC regulated supply. The anode of CR7 is connected through resistor RS9 of 150K ohms to the collector of 24 - 1~9379~ transistor Q13, signal B16, through resistor R85 of 3.32K ohms to the -8 Volt supply.

The emitter of transistor Q12 is connected directly to ground potential.

The collector of transistor Q14, signal 821 (inverted threshold), is connected through R57 of 5.62K ohms to the positive 8 volt DC power supply, and through R170 lOK ohms to the base of a transistor Q16, signal KAl, one end o resistor 171 of lOK ohms, one end of resistor R172 of 5.11K ohms.

The emitter of transistor Q14 is connected directly to ground potential.

The base of transistor Q14 is connected to the cathode of diode CR8 and to one side of resistor R60 of lOK ohms.

The anode of diode CR8 is connected to ground potential.

Signal B16 is also connected to terminals 1, 2, 5, 6, 8 and 9 of logic buffer U22 and through resistor R85 of 3.32K ohms to the -8V DC supply.

The anode of diode CR8 is connected to ground.

The cathode of diode CR9 is connected to one side of a resistor R86 of 10 meg ohms, one side of a capacitor C60 of .047 microfarads and to terminal 13 o~ logic sensor driver U23.

The opposite sides of resistor R86 and the anode of diode CR9, signal B17, are connected to terminal 11 of the logic buffer U22 and to terminals 1 and 2 of Logic Sensor U23. Through resistor R87 of 22 meg ohms, one end of CR10 is connected to terminals 4 and 10 oE logic buffer U22, to signal B18A terminals 5 and 6 of I.ogic Sensor Driver U23 and to the positive side of capacitor C61 of 2.2 microfarads. Terminals 3, 12 and 13 of U22 are connected together.

The terminal 11 of logic sensor driver U23 provides hold signal Bl~.

Terminal 10 of logic sensor driver U23 is connected to the anode of diode CRll.

The lZ937~1 cathode of CRll is connected to resistor R88 of lOK ohms and provides loss of signal output B19A.

Terminals 7 of U22 and U23 `and the other end of capacitors C60 and C61 and resistor R85 are connected to -~V DC. Terminals 14 of U22 and U23 are connected to +8V DC. Terminals 4, 8 and 9 are connected together and 3 and 12 of U23 are connected together. The other end of R88 is connected to ground.

Signal line A6 is connected to the positive side of capacitor C47 of 47 microfarads. The outer shield of signal line A6 is connected to ground. The negative side of capacitor C47 is connected through resistor ~61 of 100 ohms to ground and to one end of potentiometer resistor R62 of lOK ohms. The other end of R62, signal line A7, is connected to one side of capacitor C48 of .01 microfarads, to the wiper of R62 and to capacitor CSl of 1.0 microfarads. The other end of C48 is connected to ground.

The other end of C51 is connected through resistor R66 of 5.62K ohms. The opposite end of R66, signal line A8, is connected to terminal 5 of compressor control U13A, terminal 2 of compressor amp U14A, one side of resistor R68 of lM ohms, one side of capacitor C56 of 33 picofarads and one side of resistor R69 of lOR ohms. Terminal 1 of U13A is connected through resistor R63 of 330K ohm~ to qround.

Terminal 6 of U13A is connected through resistor R64 of lK ohms to the positive end of capacitor C54 of 22 microfarads and to one side oE resistor R67 of lOK ohms. The other side of R67 is connected to terminal 3 of U14~ and through capacitor C55 of .01 microfarads to ground. The negative side of C54 is connected to ground. Terminal 7 of U13A is connected to the positive side of capacitor C52 of 2.2 26 12~3791 microfarads. Terminal 3 of U13~ is connected through resistor R65 of 3.32 ohms to the positive side of capacitor C53 of 2.2 microfarads. Terminal 2 of U13A is connected to the positive side of capacitor C50 of 1.0 microfarads. The other side of C50 is connected to ground. The remaining ends of capacitors C52 and CS3 are connected together with terminal 1 of U14A, and the other end of R68, the other end of C56, one end of resistor R70 of lOK ohms and to one end of capacitor C58 of 1.0 microfarads. The remaininq ends of R69 and R70 are tied together and connected to one end of potentiometer resistor R71 of lOOK ohms, the wiper of R71 and to the positive side of capacitor C57 of 22 microfarads. The remaining end of potentiometer resistor R71 is connected to the positive 8 volt supply line and the remaining end of C57 is connected to qroùnd. l'he remaining end of C58, signal A12, is connected through resistor R72 of 16.2K ohms to ground and through resistor R73 of 3.32K ohms to terminal 3 of amplifier U17A. Terminal 2 of U17 is connected to one end of resistor R75 of 100l( ohms and through resistor R74 of 3.3 K ohms to ground. The other end of R75 tsignal A13) is connected to terminal 1 of U17A and to one end of resistor R76 of lOK ohms. The other end of R76 is connected to terminal 7 of s~uaring amplifier U18A. Terminal 6 of U18A is connected to one end of resistor R185 o~ lOK ohms and to both the wiper and one end of potentiometer resistor ~79 of lOOK ohms. The other end of resistor R185 is connected to one end of resistor ~78 of S.llK ohms and through resistor R77 of 100 ohms to ground.

The remaining end of R78 is connected to the positive 8 volt supply. Terminal 3 of U18A is connected to the positive 8 volt supply and to the positive end of .01 1~379J~ microEarad capacitors: C79, C77, C72 and C71 oE 22 microfarads.

Also connected to this positive 8 volt line i5 terminal- 16 of compressor control U13B, terminal 8 of compressor amplifier U14B, the wiper, and one side of potentiometer resistor R99 of lOOK ohms and terminal 8 of amplifier U17B. The other ends of C79, C77, C72 and C71 are all connected to ground.

Terminal 1 of U13A A15 is connected through resistor R80 of lOK ohms to terminal 4 of squaring amplifier U18B. Terminal 2 of U18~ signal A16, is connected through resistor R82 of 200K ohms to resistor R79. Terminal 5 of U18B is connected through resistor R81 of lOK ohms to ground.

Referring now to short range channel 2, input A6A is fed through a capacitor C62 of 47 microfarads, positive side, to one side of resistor R90 of 5.11K ohms and resistor R~9 of 100 oh ms.

The opposite side of resistor ~89 is connected to ground.

The opposite side of resistor R90 is connected to one side of capacitor C63 of .01 microfarads and to one side of capacitor C66 of 1 microfarad.

The other side of C63 is connected to ground.

The opposite side of capacitor C66 is connected to one side of resistor R94 of 5.62K ohms. The other side of resistor R94 A8A is connected to terminal 11 of V138, to terminal 6 of U14B, to one side of resistor R96 of 1 Meg ohm, to one side of capacitor C74 of 33 picofarads and to one side of resistor R97 of lOK ohms.

The opposite side of R96, signal A9A, is connected to terminal 7 of U14B.

Terminal 12 of U13B is connected to one side of capacitor C64 of .1 microfarads.

The other side of capacitor C64 is connected to ground.

Terminal 15 of U13B 28 3'~1 is connected to one side of resistor R91 of 330K ohms. The opposite side of resistor ~91 is connected to ground.

Terminal 14 of U13B is connected to the positive side of capacitor C65 of 1.0 microfarads. The opposite side of capacitor C65 is connected to ground. Terminal 8 of U13B is connected to ground. Terminal 13 of ul3s is connected to one side of resistor ~92 of 3.32K ohms. The opposite side of resistor R92 is connected to the positive side of capacitor C68 of 2.2 microfarads. Terminal 9 of U13B AlOA is connected to the positive side of capacitor C67 of 2.2 microfarads. The other side of capacitor C67 is connected to tlle other end of C6B, to terminal 7 of U14B A9A, to the other side of capacitor C74, to one side of a resistor P~98 of lOK ohms and to one side o capacitor C76 of 1.0 microfarads. Terminal 10 of U13B is connected to one side of resistor ~93 of lK ohm. The oppositc side of resistor R93 is connected to the positive side of of capacitor C69 of 22 microfarads and to one side of resistor R9S of lOK ohms. The other side of capacitor C69 is connected to ground. The other side of resistor R95 is connected to terminal 5 of U14B and capacitor C70 of .01 microfarads.

The other end of capacitor C70 is connected to ground. The opposite ends of resistors ~97 and ~g8 are connected to the positive side of capacitor C75 of 22 microfaradsand to the other side of potentiometer resistor R99. The opposite side of capacitor C75 is connected to ground. Terminal 4 of U14B is connected to -BV DC supply and to capacitor C73 of .01 microfarads. The other side of capacito~ C73 is connected to ground.

29 1~3~791 Referring now to U17B, terminal 5 is connected to one side oE resistor R101 of 3.32K ohms. The other side of resistor R101 A12A connected to the other side of capacitor C76 and one side of resistor R100 of 16.2K ohms.

The other side of resistor R100 is connected to ground.

Terminal 6 of U17B is connected to one side of resistors R103 of 100K ohms and R102 of 3.32K ohms. The other end of resistor R102 is connected to ground and to one side of capacitor C78 of .01 microfarads. The opposite side of capacitor C7~ is connected to pin 4 of U17B and to the 8VDC supply.

Terminal 7 A13A is connected to the other end of resistor R105 of lOK ohms. Terminal a is connected to the +8V DC sllpply and to one side of resistor R104 of 5.11K ohms.

Referring now to U18C, terminal 9 is connected to the other side of resistor R105 A14A. Terminal 8 is connected to one end and the wiper of potentiometer resistor R107 of lOOK ohms and to one slde of resistor R106 of lOK ohms. The opposite side of resis~or R106 is connected to the other end of resistor R104 and to one end of resistor R186 of 100 ohms. The opposite end of R186 is connected to ground. Terminal 14 A15A is connected to one side of resistor R108 of lOK ohms and Rlll of 3.65K ohms.

The other side of ~111 A17A is connected to one side of R112.

Referring now to U18D, terminal 10 is connected to the other side of resistor R108. Terminal 11 is connected through resistor R109 of lOK ohms to ground. Terminal 12 is connected through capacitor C80 of .01 microfarads to ground and directly to the -8V DC supply. Terminal 13 A16A 1~3t~.9i is connected to one side of resistor RllO of 200K ohms.

The opposite side of resistor RllO is connected to the other end of potentiometer resistor R107.

Referring now to Long Range channel 1, input A6B is fed through the positive side capacitor C81 of 47 microfarads, to one side of resistor R119 of 100 ohms and potentiometer resistor R120 of lOR ohms.

The opposite side of resistor Rll9 is connected to ground.

The opposite end and wiper of potentiometer Lesistor R120 A7B is connected to one side of capacitor C82 of .01 microfarads and to one side of capacitor C85 of 1 microfarads.

The other side of C82 is connected to ground.

The opposite side of capacitor C85 lS connected to one side of resistor 1~124 of 5.62K ohms.

The other side of resistor R124 A13B is connected to terminal 5 of U15A, to terminal 2 of U16B, to one side of capacitor C92 of 33 picofarads, to one side of resistor R126 of 1 meg ohm, and to one side of resistor R127 of 10K ohms.

The opposite side of resistor R126 A9EI is connected to terminal 1 of U16B.

Terminal 4 of U15A is connected to one side of capacitor C 83 of .1 microfarads.

The other side of capacitor C83 is connected to ground.

Terminal 1 of U13B is connected to one side of resistor R121 of 330K ohms.

The opposite side of resistor R121 is connected to ground.

Terminal 2 of U15A is connected to the positive side of capacitor C84 of 1 microfarad.

The opposite side of capacitor C~4 is connected to ground.

Terminal 3 of U15A is connected to resistor R122 of 3.32K ohms the other end of which is connected to the positive side of capacitor C87 of 2.2 microfarads.

Terminal 7 of U15A AlOC is connected 1~3'7gl to the positive side of capacitor C86 of 2.2 microfarads of capacitor C86 is connected to the other side of capacitor C87, to terminal 1 of U16B A9B, to the other side of capacitor C92, to the other side of R126, to one side of a resistor R123 of lOK ohms and to one side of capacitor C94 of 1.0 microfarads. Terminal 6 of U15A is connected to one side of resistor R123 of lK ohms. The positive side of capacitor C88 of 22 microfarads and to one side of resistor R125 of lOK ohms. The other side of capacitor C88 is connected to ground. The other side of resistor R125 is connected to terminal 3 of U16B and one side of capacitor C89 of .01 microfarads. The other end of capacitor C89 is connected to ground. The opposite ends of resistor R127 and R128 are connected to the positive side of capacitor C93 of 22 microfarads and to the wiper and one end of potentiometer resistor R129 of lOOK ohms. The opposite side of capacitor C93 is connected to ground. The opposite side of potentiometer resistor R129 is connected to the +~V DC supply. Terminal 4 of U16B is connected to the -8V DC supply.

Referring now to U19A, terminal 3 is connected to one side of resistor R131 of 3.32K ohms. The other side of resistor R131 A12B is connected to the other side of capacitor C94 and one side of resistor R130 of 16.2K ohms.

The other side of resistor R130 is connected to ground.

Terminal 2 of U19A is connected to one side of resistor R133 of lOOK ohms and R132 of 3.32K ohms. The other end of resistor R132 is connected to ground. Terminal 4 is connected to the -av DC supply. Terminal 1 A13B is connected to the other end of resistor R133 and to one side of resistor R135 of lOK ohms.

1~3'7~1 Re~erring now to U20A, terminal 7 is connected to the other side of resistor R135 A14B. Terminal 6 is connected to one end and the wiper of potentiometer resistor R138 of lOOK ohms and to one side of resistor R136 of lOK ohms. The opposite side of resistor R136 is connected to one side of resistor R134 of 100 ohms and R137 of 5.11R ohms. The opposite end of R134 is connected to ground and the opposite end of R137 is connected to the +8V DC supply, Terminal 3 is connected to the +8V DC supply.

Terminal lA15B is connected to one end of resistor R139 of lOK ohms, and resistor R142 of 3.65K ohms. to terminals 6 and 8 of U26. The opposite side of R142 A17B is connected to one side of R143 of 2.21K oh~s. The opposite side of R143 is connected to the +5V DC supply.

Referring again to U20B, terminal 4 is connected to the other side of resistor R139. Terminal S is connected through resistor R140 of lOK ohms to ground. Termir.al 2 A16B is connected to one side of re~istor R141 of 200K ohms. The opposite side of resistor R141 is connected to the other end of potentiometer resistor R138. Terminal 12 is connected to -8VDC supply.

Referring now to long range channel 2, input A6C is fed through positive side capacitor C100 of 47 microfarads, to one side of resistor R145 of 5.11K ohrns and resistor R144 of 100 ohms. The opposite side of resistor R144 is connected to ground. The opposite side o~ resistor R145 is connected to one side of capacitor C101 of .01 microfarads and to one side of capacitor C104 of 1 microfarad. The other side of C101 is connected to ground. The opposite 33 1293~ side of capacitor C104 is cGnnected to one side of resistor R149 of 5.62K ohms. The other side of resistor R149 A8C i6 connected to terminal 6 of U16B, to one side oE resistor R152 of 1 meg ohm, to one side of capacitor C112 o~ 33 picofarads to terminal 11 U15B, and to one side oE resistor R152 of lOK ohms. The opposite side of resistor R151 A9C is connected to terminal 7 oE U16B.

Terminal 12 of ~15B is connected to one side of resistor Cln2 of .1 microfarads. The other side of capacitor C102 is connected to ground. Terminal 15 of U13B is connected to one side of resistor ~146 oE 330K ohms.

The opposite side of resistor R146 is connected to ground.

Terminal 14 of U16B is connected to the positive side of capacitor C103 of 1 microfarads. The opposite side of capacitcr C103 i~ connected to ground. Terminal 8 of U15B is connected to ground. Terminal 13 oE U15B AllC is connected to one side of resistor R147 of 3.32K ohms. The opposite side of resistor ~147 is connected to the positive side of capacitor C108 of 2.2 microfarads. Terminal 9 of U15B AlOC is connected to the positive side of capacitor C107 of 2.2 microEarads. The other side of capacitor C107 is connected to the other side of capacitor C108, to terminal 7 of U16B A9C, to the other side of capacitor C112, to one side oE a resistor R153 of lOK ohms and to one side of capacitor C114 of 1 microfarad. Terminal 10 of UlSB is connected to one side oE resistor R148 of lK ohm.

The opposite side of resistor R148 is connected to the positive side of capacitor C109 of 22 microEarads and to one side of resistor R150 of lOK ohms. The other side oE capacitor C109 lc connected to ground. The other side of 34 3 ~ resistor R150 is connected to terminal 5 of U16B and one side of capacitor CllO of .01 microfarads. The other end of capacitor CllO is connected to ground. The opposite ends of resistors R152 and R153 are connected to the positive side of capacitor C113 of 22 microfarads and to the other side of potentiometer resistor R154. The opposite side of capacitor C113 is connected to ground.

Referring now to U19B, terminal 5 is connected to one side of resistor R156 of 3.32K ohm. The other side of resistor R156 A12C is connected to one end of resistor R155 of 16.2K ohms and to the other side of capacltor C114.

Terminal 8 is connected to the +8V DC power supply and to one side of resistor R159 of 5.11K ohms. The other end of R155 is connected to ground.

Referring now to U20C, termlnal 9 A14C i8 connected to the other side of resistor R160. Terminal 8 is connected to one end and the wiper of potentiometer resistor R163 of lOOK ohms and to one side of resistor R161 of lOX ohms. The opposite side of resistor R161 is connected to the other end of resistor R159 and to one end of resistor R162 of 100 ohms.

The opposite end of R162 is connected to gro~nd. Terminal 14 A15C is connected to one side of resistor R164 of lOX ohms and R167 of 3.65K ohms. The other end of R167 A17C is connected to one side of resistor R168 of 2.21X ohms and terminals 1 and 5 of U26. The other side of R168 is connected to ~5V line.

Referring now to U20D, terminal 10 is connected to the other side of resistor R164. Terminal 11 is connected through resistor R165 of lOK ohms to gro~nd. Terminal 13 1~3~7~1 A16C is connected to one side of resistor R166 of 200K ohms. The opposite side of resistor R166 is connected to the other end of potentiometer resistor R163.

The other side of capacitors C72, C77, C79, C91, C95, C96, C105, C106, Clll, C115, and C116 of .01 microfarads are connected to ground.

Capacitors C71 and CS9 of 22 microfarads have their negative sides connected to ground.

The other end of C59 is connected to the +5VDC supply, and the other end of C71 is connected to the +8VDC supply.

Continuing from A15, terminal 1 of squaring amplifier U18A is connected to one end of resistor R83 of 3.65K ohms and to one end of resistor R169 of 3.65K ohms. The other end of R169, signal A17D, is connected out and to one end of resistor R113 of 2.21K ohms. The other end of R83 A17 is connected to one end of resistor ~84 of 2.21K ohms and out and to terminal 5 of channel comparator U25. The remaining ends of R84 and R113 are both connected to the positive 5 volt line. The positive end of capacitor C59 of 22 microfarads is connected to the positive 5 volt line as is one end of resistor R112 of 2.21K ohms. The other end of C59 is connected to ground and the other end of R112 is connected to the other end of resistor Rlll, terminal 4 of pulse generator V24 and to signal line A17A.

Starting now at signal line AlSB, terminal 1 of long range squaring amplifier U20~ is connected to one end of resistor R139 of lOK ohms and to one end of resistor R142 of 3.65K ohms. The other end of R142 A17B is connected 1~337.~1 through resistor R143 of 2.21K ohms to the positive S volt line and to terminals 6 and 8 of long range phase detector U26.

Starting now at signal line AlSC, terminal 14 of long range squaring amplifier u20C is connected to one end of resistor R164 of lOK ohms and to one end of resistor R167 of 3.65K ohms. The other end of R167 is connected to terminals 1 and S of U26 and to one end of resistor R168 of 2.21R ohms. The other end of R168 is connected to the positive 5 volt line. Terminals 2, 4 and 9 of U26 are connected together. Terminal 7 of U26 is connected to ground. Terminals 3 and 13 of U26 are connected together.

Terminals 10 and 12 of U26 are also connected together.

Terminal 14 of U26 is connected to the positive S volt line. Terminal 11 of U26 KA i9 connected to one end oE resistor R171 of lOK ohms. The other end of R171 KAl is connected to one end of resistor R172 of 5.11K ohms, one end of resistor R170 of lOK ohms and the base of long range slope inverter Q16. The other end of 2172 is connected to ground while the other end of R170 is connected to previously described line B21.

The emitter of Q16 is connected to ground and the collector of Q16 KA2 is connected to one end of resistor R174 of SllK ohms and to one end of resistor R173 o~ lK ohms. The other end of R173 is connected to the positive 5 volt line. The other end of R174 is connected to one end of resistor R175 of SllK ohms and to one end of capacitor C118 of .1 microfarads. The other end of R175 KA3 is connected to terminal 5 of long range integrator U27A and to one end of capacitor Cll9 of .047 microfarads. The other end of Cll9 i9 connected to ground. Terminal 4 of U27A is connected to the minus 8 lXC~37'3i volt line and to one end of capacitor C120 of .01 microfarads. The other end of C120 is connected to ground.

The other end of Clla signal KA4 i.s connected to both terminals 6 and 7 of U27A, to one end of resistors R177 of lOK ohms and potentiometer resistor R178 of lOK ohms. The other end of R178 is connected to geound and the ~iper is connected to one side of long range indicator I12. ~he other end of I12 is connected to ground.

Terminal 8 of U27A is connected to both the positive 8 volt line and to one end of capacitor C121 of .01 microfarads. The other end of C121 is connected to ground.

The other end of resistor R177 is connected to one end of Rl 81, of lM ohms KA5 and to terminal 3 of long range comparator U27B. Terminal 2 of U27B is connected to one end of resistor R176 of 2K ohms, one end o resistor R179 of 47.5K ohms and the positive side of capacitor C122 of 2.2 microfarads. The other end of R176 is connected to the positive 5 volt line and to one end of capacitor C117 of .01 microfara-]s. The other en~ of C117 is conn~cted to ground. The other end of C122 is also connected to ground, while the remaining end of R179 is connected to one end of potentiometer resistor R180 of 500 ohms. The other end of R180 is connected to ground and to its wiper.

The other end of R181 is connected to one end of resistor R183 of 330 ohms, to terminal 1 of U27B KA6, through resistor R182 of lOK ohms to one end of resistor R184 of 3.32K ohms KA7, and to the base of transistor Q17.

The other end of R1~4 is connected to ground. The emitter of Q17 is connected to ground, and the collector provides output signal K4. The other end of R183 KA8 is connected 38 3'~91 to one end of indicator Il4. The other end of Il4 is connected to ground. Indicator Il3 is connected to ground, and the other end is connected to resistor Rll8 of 330 ohms to the collector of transistor QlS to signal out E4. The emitter of Ql5 is connected to the positive 8 volt line, and the base of Ql5 is connected to the negative side of capacitor C99 of 2.2 microfarads, one end of resistor Rl17 of lR ohms and one side of resistor R 116 of 3.3K ohms.

The remaining sides of both C99 and Rl17 are connected to the positive 8 volt line. The other end of Rl16 is connected to terminal l of U25 E2. Terminal 14 of U25 is connected to both the positive 5 volt line and to the positive end or capacitor C98 of .Ol microfarads. The other end of C98 is connected to ground. Terminals 4, 6, 7, 8, 9, lO and ll of U25 are all connected to ground.

Terminal 3 of U25 is connecte~ though resistor Rl15 of lOK ohms to terminal 6 of U24 El. Terminal 2 of U24 is connected through capacitor C97 of.OOl microfarads to ground and connected through resistor 11114 of lOK ohms to the positive 5 volt line. Terminals 3, 5 and 16 of U24 are also connected to the positive 5 volt line, and terminals l, 8, ll, 12, 13, 14 and 15 are connected to ground.

39 1.2~?3791 Referring specifically now to Fig. 5. The Figs. are combined as shown in Fig. 5. Figure 5 shows the schematic for the signal processer of Figs. 2C-2D.

Referring now to the upper left hand corner of the combined fig. there is shown a range phase detector U32.

Terminals 1 and 5 are connected together and are connected to the signal line Al7A.

Terminals 6 and 8 are connected together and are connected to the channel 1 signal line Al7.

Terminals 4, 2 and 9 are interconnected, terminals 10 and 12 are interconnected and terminals 3 and 13 are interconnected.

Terminal 14 is connected to the positive 5 volt D.C.

regulated power supply, to one side of a resistor R207 of lK ohms, to one side of a capacitor Cl42 of .01 microfarads, the other side of which is connected to ground. Terminal 7 is connected to ground potential.

Terminal 11, signal Al8, is connected to one side of a resistor R205 of lOK ohms. The opposite side of the resistor R205, signal Al9, is connected to the base of transistor Q27, to one side of the resistor R206 of 5.11K ohms and to one side of a resistor R204 of lOK ohms. The opposite side of resistor R204 is connected to the signal line B21.

The opposite side of the resistor R206 is connected to ground potential. The opposite side of the resistor R207 is connected to the collector of the transistor Q27, to one side of a resistor R208 of lOOK ohms and to one side of a resistor R228 of 150K ohms. The emitter of transistor Q27 is connected to ground potential.

The opposite side of the resistor R208 is connected to terminals 9 and 10 of range hold switch U33A. Terminal 7 of hold range switch Ul~A is connected to the negative 8 volt D.C. regulated power supply and also through a lZ~ 91 capacitor C143 and C144 of .01 microfaracls to ground potential. Terminals 11 and 8 are interconnected and connected to one side of a eesistor R211 of 511K ohms and to one side of a capacitor C145 of .1~ rnicrofarads. The opposite side of the capacitor C145 is connected to ground potential. Terminals 6 and 12 of the hold range switch U33A are interconnected and connected to one side of a resistor R226 of lOK ohms and to terminals 5 and 13 of the Doppler hold switch U33B. The opposite side of the resistor R226 is connected to signal line Bl9.

The opposite side of resistor R211 is connected to one side of a resistor R210 of 511K ohms and one side of a capacitor C147 of .10 microfarads. The other side of the resistor R210 is connected to terminal 12 of operational amplifier U34~, through a capacitor C14~ of .0~7 microfarads, to terminal 11 of operational amplifier U34A and to ground.

The opposite side of the capacitor C147 is connected to one side of a resistor R209 of lM ohms, to terminal 14, signal K3, of operational amplifier U34A and to one side of a resistor R212 of 20K ohms. The oppositc side of the resistor R209 is tied to terminal 13 of the operation amplifier U34A. The opposite side of resistor R212 is connected to terminal 10 of operational ampli~ier U34B to one side of a resistor R213 of 20K ohms and signal K4.

The oE)posite side of the resistor R213 is connected to ground. The junction of R212 and R213 is signal K4 ~Ihich is also connected to the collector of Q17.

Terminal 4 of operational amplifier U34B is connected to terminal 14 of the hold range s~itch [133A, to one side of a potentiometer resistor R214 of lOK ohm~, to one side capacitors C146, C150, C151 and C167 of .01 microfarac]s.

1~<~3791 The opposite sides of the last mentioned capacitors are tied to ground. Terminal 4 of operational amplifier U37A and terminal 4 of opera~ional amplifier U34B are connected to ~8V DC supply. Terminal 9 of operation~l amplifier U34B is connected to one side of resistor R215 of 100K ohms, to one of resistor R216 of 100K ohms and to one side of capacitor C149 of .01 microfarads. The opposite side of the resistor R216, signal K5, to the other side of C149, is connected to terminal 8 of operational amplifier U16B, to one side of a resistor R217 of 33.2K ohms and to olle side of a resistor R218 of 2K ohms. The opposite side of the resistor R218 is tied to ground. The opposite side of the resistor R215 is tied to the wiper of a potentiometer resistor R214.

One side of the potentiometer R214 is connected to ground.

The other side of the resistor R217, signal K6 is connected to terminal 10 of operational amplifier U37A.

Terminal 9 of operational amplifier U17A is connected to one side of a potentiometer resistor R220 of 100K ohms and to one side of a resistor R219 of 33.2K ohms. The opposite side of the resistor R219 is connected to ground. The other side of the potentiometer resistor R220, signal K7, is connected to terminal 8 of operational amplifier U37A, to one side of a resistor R222 of 100K ohms, to one side of a resistor R221 of 10K ohms to the wiper of potentiometer ~220 and to one side of potentiometer resistor R223 of l0K ohms. The opposite end of the resistor R221 is connected to ground. The wiper of the potentiometer resistor R223 is connected to one side of indicator I8. The other side of I8 is connected to ground. The opposite side of the potentiometer R223 is cGnnected to ground potential. The 42 1~3'7~1 opposite side of the resistor R222 is connected to the driving monitor sum input to terminal 5 of operational amplifier U37D, to one side of a resistor R237 of lOOK ohms, to one side of a r~sistor R25~ of lOOK ohms and to one side of a resistor R259 of 100~ ohms. The opposite side of the resistor R259 is connected to ground.

Referring now to the frequency to analog converter U35~, terminal 12 is connected to one side of a resistor R224 of lOK ohms. The other side of the resistor R224 is connected to the audio test point and to the Doppler signal ~17D from ~igure 4. The terminals 13 and 11 of U35A are interconnected and connected to one side of a resistor R225 of 150K ohms, to the positive 5 volt D.C. regulated power supply. The 5VDC supply is connected to the cathode of diode CR21, to terminal 3, 5 and 16 of frequency to analog converter U35B, to one side of a resistor R246 of lOOK ohms and to one side of a capacitor C156 of .01 microfarads. The opposite side of the resistor R225 is connected to terminal 14 of the frequency to analog convertor U35A and to one side of a capacitor C152 of .001 microfarads. The opposite side of the capacitors C152 and C156 are connected to ~round potential. Terminal 10 of the frequency to analog converter U35~ point D is connected to one side of a resistor R227 of lOOK ohms and to one side of a resistor R260 of 150K ohms.

The anode of diode CR21 is connected to the anode of a diode CR22 and one side of a resistor ~245 of lOK ohms.

The opposite side of the resistor R245 is connected to the automobile speed signal S. The cathode of the diode CR22, signal Sl, is connected to terminal 4 of the frequency to analog converter of U35B and also to one side of a resistor 12~3'~ 91 R247 of lOOK ohms. The opposite side of the resistor R247 is connected to ground. Terminal 1 of the frequency to analog converter U35B is connected directly to ground.

Terminal 2 of frequency analog convertor U35B is connected to the opposite side of the resistor R246 and to one side of a capacitor C157 of .1 microfarads. The opposite side of the capacitor C157 is connected to ground. Terminal 6, signal S2 of frequency to analog converter U35B is connected to one side of a resistor R248 of 330K ohms.

The opposite side of the resistor R260, signal G, is connected to one side of a capacitor C161 of .02 microfarads and to one side of a resistor R261 of lS0~ ohms. The other opposite side of the capacitor C161 is connected to terminal 13 of the Doppler integrator U36A, to one side of the resistor R263, to terminal 14, signal G2, of the operational amplifier U36A and to one side of a resistor R262 of lOK ohms. The opposite side of the resistor R262 iS connected to ground. Terminal 11 of operational amplifier U36A is connected directly to ground.

The opposite side of the resistor R261, signal Gl, is connected to terminal 12 of operational amplifier U36A and to one side of a capacitor C162 of .01 microfarads. The opposite side of the capacitor C162 is connected to ground.

The opposite side of the resistor R227 is connected to terminals 2 and 3 of hold switch ~oppler U338.

Terminals 1 and 4, slgnal Dl, of hold switch Doppler U33B are interconnected and connected, to one side of a resistor R229 of 511~ ohms and to one side of a capacitor C153 of .18 microfarads. The other side of the capacitor C153 is connected to ground. The other side of the resistor R229 3'7~ is connected to one side of a capacitor C154 of .10 microfarads and to one side of a resistor R231 of 511K ohms. The o~posite side of the capacitor C154 is connected to one side of a resistor R230 of lM ohms, to terminal of operational amplifier U34C D3 and to one side of a potentiometer resistor R232 of 1 OK ohms. The opposite side of the resistor R230 is connected to terminal 2 of operational amplifier U34C. The opposite side of the resistor R231, signal D2, is connected to terminal 3 of operational amplifier U34C and to one side of a capacitor C155 of .047 microfarads. The opposite side of capacitor C155 is connected to ground.

The opposite side of the resistor n24~ is connected to one side of resister ~249 of 1 megohm and to one side of a capacitor C15~ of .47 microfarads. The opposite side of the capacitor C158 is connected to groulld.

The opposite side of the resistor R249 is connected to one side of a resistor R250 of 1 meg ohm and to one side of a capacitor C159 of .18 microfarads. The opposite side of the resistor R250, signal S3, is connected to terminal 5 of operational amplifier U34D and to one side of a capacitor C160 of .1 microfarads. The opposite side of the capacitor C159 is connected to one side of the resistor ~251 of 2 meg ohms, to the DM speed line S4, to terminal 7 of operational amplifier U34D and to one side of a potentiometer R252 of lOK ohms. The opposite end of the resistor R251 is connected to terminal 6 of the operational amplifier U34D.

The opposite side of the resistor R263, signal G3, is connected to terminal 10 of operational amplifier U36~.

Terminal 9 of operational amplifier U36~ is connected to 12~3791 one side of a potentiometer resistor R265 of lOOK ohms and to one side of a resistor R264 of 33K ohms. The opposite side of the resistor R264 is connected to ground.

Terminal ~ of operational amplifier U36B, signal G4, is connected to one side of a resistor R266 of 33K ohms, to the other end of potentiometer resistor R265, to the wiper o potentiometer resistor R265 and to one side of a resistor R267 of lOK ohms. The opposite side of the resistor R267 is tied to ground potential.

The opposite side of the potentiometer R232 is tied to ground. The wiper of that potentiometer is connected to one side of a resistor R233 of 33K ohms. The opposite side oE the resistor R233, signal D4, is connected directly to terminal 12 of operational amplifier U~7B.

Terminal 13 of operational amplifier U37B is connected to one side of a resistor R234 of 33K ohms and to one ~ide of a resistor R235 of lOOK ohms. The opposite side oE the resistor R234 is connected to ground.

The terminal 14 of operational amplifier U37E3, signal DS, is connected to the opposite end of the resistor R235, to one side of a resistor R236 of lOK ohms, to the one side of the resistor R237 and to one side of potentiometer resistor R238 of lOK ohms. The opposite side of the resistor R236 iS connected to ground. The opposite side of potentiometer R238 is connected to ground and its wiper signal D6, is connected through indicator I9 to ground potential.

The opposite end of potentiometer R252 is connected to ground. The wiper of that potentiometer is connected 46 1;2~37'~1 through a resistor R253 of 33K ohms to terminAl 3, signal S5, of operational amplifier U37C.

Terminal 2 of operational amplifier U37C is connected to one side of resistor R254 of 33K ohms and to one side of a resistor R256 of lOOK ohms. The opposite side of the resistor R254 is connected to ground. Terminal 11 of operational amplifier U37C is connected directly to ground. Terminal 1 of operational amplifier U37C is tied to one side of a potentiometer resistor R255 of 10K ohms, to one side of the resistor R258 of 100K ohms, to the other side of the resistor R256 and to one side of a resistor R257 of lOK ohms. The opposite side of the resistor R257 is connected to ground potential. The wiper of potentiometer R255, signal S7, is connected is connected through indicator I10 to ground potential. The opposite end of the potentiometer R255 is connected to ground potential.

The opposite end of the resistor R266 is connected to one side of potentiometer resistor R280 of lOK ohms. The opposite side of the potentiometer resistor R280 is tied to ground potential.

The opposite side of the resistor R228 i.s tied to one side of a capacitor C163 of .02 microfarads, signal H and to one side of a resistor R26~ of lsnK ohms. The opposite side of the resistor R268, signnl Hl, is connected to terminal 3 of operational amplifier U36C and to one side of a capacitor C164 of .01 microfarads. The opposite side of the capacitor C164 is connected to ground. The opposite side of the capacitor C163 is connected to terminal 1 and 2 o~ operational amplifier U36C, signal H2 and to one side of a resistor R269 of 10K ohms. The opposite side of the resistor R269, signal H3, is connected to terminal 5 of 47 lZ~37'~1 U36D and to one side of a resistor ~270 of 10K ohms. The opposite side of the resistor R270 is connected to ground potential.

Terminal 6 of operational amplifier U36D iS connected to one side of potentiometer resistor R271 of 100K ohms, to one side of a resistor R273 of lOOK ohms and to capacitor C165 of .01 micro farads. The opposite side of the resistor R273 and capacitor C165 is connected to terminal 7, signal H4, oE operational amplifier U36D, to one side of a resistor ~275 of 33K ohms and to one side of a resistor R274 of lOK ohms. The opposite .side of the resistor R274 is connected to ground. Terminal 4 of operational amplifier U36D is connected to the + 8 volt supply. The other end of the resistor R271 is connected to the wiper of a potentiometer resistor R272 of 100K ohms. One side of the potentiometer resistor R272 is connected to ground and the other side is connected to the +8V DC. A capacitor C166 of .01 micro~arads is connected across the +~V DC to ground.

Terminal 6 of operational amplifier U37D is connected to one side of a resistor R240 of lOOK, and to one side of a resistor R239 of 33K ohms and to one side of capacitor C169 of .47 micro farads. The opposite side of the resistor ~239 i~ connected to ground potential. Terminal 7 of operational amplifier U37D, signal Vl, is connected to one side of a potentiometer R244 of lOK ohms, to the other side of the resistor R240, to the other side of capacitor C169, to one side of the resistor R241 of 10K ohms, to one side of the resistor R242 of 10K ohms, and to one side of a resistor R325 of 10K ohms. The opposite side of the 48 12t~37~ resistor R241 is connected to ground. The opposite end of the potentiometer resistor R244 is connected to ground potential. ~he wiper of potentiometer resistor R244, signal VlA, is connected to ground through Indicator Ill.

Connected to the oppvsite side of the resistor R242, signal V2, is one end of a potentiometer resistor R243 of lOOk ohms, one ~ide of a resistor R321 of lOK ohms, positive side of capacitor C168 of 10 micro farads, and one side of a resistor R318 of lOK ohms. The opposite end of the potentiometer resistor R243 is connected to ground through "Jl." The wiper of potentiometer R243 is connected to the V2 side of resistor R242.

The wiper of potentiometer R280 is connected to one side of a resistor R281 of lOR ohms and one side of a resistor R282 of lOX ohms. The opposite end of the resistor R281 is connected to terminal 12 of operational amplifier U38~. Terminal 11 of operational amplifier U38A is connected to ground potential. Terminal 13 of operational amplifier U38A, signal G6~, is connected to one side of a resistor R284 of lOOK ohms, to terminal 14 of operational amplifier U38A and to one side of a resistor R283 of lX ohm. The opposite side of the resistor R283 is tied to ground.

The opposite side of the resistor R275 signal HS is tied to terminal 3 of vperational amplifier U38D.

Terminal 2, of operational amplifier U38D, is connected to one side of potentiometer ~277 of lOOK ohms, and to one side of a resistor R276 of 33K ohms. The opposite end of the resistor R276 is connected to ground. The opposite end of the potentiometer R277 is connected to one side of a resistor R279 of lOK ohms, to its wiper, to terminal 1 of 49 3~91 operational amplifier U38D, ~i~nal H6, and to one side of a resistor R278 of lOOK ohms. The opposite side of the resistor R279 is connected to ground.

The opposite side of the resistor R278 is connected to the opposite side of the resistor R284, signal Z, to terminal 5 of operational amplifier U38B and to one side of a resistor R290 of lOOK ohms.

The other end of the resistor R282, signal G6B, is connected to terminal 10 of operational amplifier U38C and to one side of a re~istor R287 of 5.1 megohm~. Terminal 9 of operational amplifier U38C is connected to one side of a resistor R286 of 180 ohms and to one side of a resistor R285 of lOK ohms. The other side of the resistor R286 is connected to ground. The other side of the resistor R285 is connected to the positive a volt D.C. regulated power supply, to terminal 4 of operational amplifier U38B, to one side of a potentiometer resistor R295 of lOK ohms, and to one side of a capacitor C179 oE .01 microfarads. The opposite side of the capacitor C179 is connected to ground potential. Terminal 8 of operational amplifier U38C, signal G7, is connected to the other end of the resistor R287 and to one side of a resistor R288 of 7.5K ohms. The other end of the resistor R288 is connected to the other end of the resistor R290, signal G8, and to one side of a resistor R289 of lK ohm. The other end of the resistor R289 is connected to ground. Terminal 6 of operational amplifier U388 is connected to one side of resistor R292 of lOOR ohms, to one side of capacitor C178 of .047 micro farads and to one side of resistor R291 of 51K ohms. The other side of the resistor R291 is connected to ground.

1~93791 operational amplifier U38D, Yiqnal H6, and to one side of a resistor R278 of lOOK ohms. The opposite side of the resistor R279 is connected to ground.

The opposite side of the resistor R278 is connected to the opposite side of the resistor R284, signal Z, to terminal S of operational amplifier U38B and to one side of a resistor R290 of lOOK ohms.

The other end of the resistor R282, signal G6~, is connected to terminal 10 of operational amplifier U38C and to one side of a resistor R287 of 5.1 megohms. Terminal 9 of operational amplifier U38C is connected to one side of a resistor R286 of 180 ohms and to one ~ide of a resistor R285 of lOK ohms. The other side of the resistor R286 is connected to ground. The other side of the re~istor R285 i9 connected to the positive a volt D.C. regulated power supply, to terminal 4 of operational amplifier U38B, to one side of a potentiometer resistor R295 of lOK ohms, and to one side of a capacitor C179 of .01 microfarads. The opposite side of the capacitor C179 is connected to ground potential. Terminal 8 of operational amplifier U38C, signal G7, is connected to the other end of the resistor R287 and to one side of a resistor R288 of 7.5K ohms. The other end of the resistor R288 is connected to the other end of the resistor R290, slgnal G8, and to one side of a resistor R289 of lK ohm. The other end of the resistor R289 is connected to ground. Terminal 6 of operational amplifier U38B is connected to one side of resistor R292 of lOOK ohms, to one side of capacitor C178 of .047 micro farads and to one side of resistor R291 of 51K ohms. The other side of the resistor R291 is connected to qround.

1~93~ The other side of the resistor R292 and capacitor C178 are connected to terminal 7 of operational amplifier U38B, signal Zl, to one side of a resistor R294 of lOK ohms and to one side of resistor R293 of lOK ohms. The other end of resistor R293 is connected to ground.

The other side of re~istor R294, signal Z2, is connected to terminal 5 of operational amplifier U40D and to one side of a resistor R296 of 2 megohms. Terminal 6 of operational amplifier U40D is connected to the wiper of potentiometer resistor R295.

The opposite end of the potentiometer resistor R295 is connected to ground.

Terminal 11 of operational amplifier U40D is connected directly to ground. Terminal 7 of operational amplifier U40D, signal Z3, is connected to one side of a resistor R299 of 330 ohms, to the other side of the resistor R296 to one side of a resistors R297 of 2K ohms and resistor R29~ of lOK ohms. The opposite side oE the resistor R299, signal Z3A, is connected through indicator I4 to the emitter of transistor Q34 both of which are tied to ground potential. The opposite side of the resistor R298 is connected to the base of transistor Q34, signal Z5. The other side of R297 is connected to the base of transistor Q33 and to the collectors of the both transistors Q35 and Q36. The collector of transistor Q35 is connected to the air bag power switch, the output of which provides an on and off function to the air bag control. The collector of Q33 is connected to the cathode of diode CR30.

The anode of CR30 is connected to ground as is the emitter of Q33.

The opposite side of the resistor R318, signal W, is connected to terminal 12 of operational amplifier U40A and to one side of a resistor R317 of 2 megohms. Terminal 13 1~37gl of operational amplifier U40A is connected to the wiper of a potentiometer resistor R319 of 10K ohms and to the CathOde Of CR23 which is connected to signal line E4.

One end of the potentiometer resistor R319 is connected to the positive 8 volt D.C. regulated power supply. Terminal 14 Of operational amplifier U40A, signal Wl, is connected to the other side of the resistor R317, to one side of a resistor R329 of 10K ohms, to one side of a resistor R330 of 330 ohms, and to one side of the resistor R328 of 51 ohms. The other side of resistor R330, signal WlB, is connected through indicator Il to ground potential. The opposite side of the resistor R329 signal W2, is connected to the base of transistor Q2a. The emitter of transistor Q28 is tied to ground. The opposite side of the resistor R328 provides signal WlA.

The collector of transistor Q28 is connected to one side of a resistor R331 of 5.1X ohms.

The opposite end of the resistor R331 is connected to the base of transistor Q29 and to one side of a resistor R333 of 10K ohms. The opposite side of the resistor R333 is connected to the positiYe 8 volt D.C. regulated power supply. The emitter of transistor Q29 is connected directly to the positive 8 volt D.C. regulated power supply. The collector of transistor Q29, signal W4, is connected to one end of C170 of .01 microfarads, to one side of a resistor R334 of lK ohm, to one side of a resistor R342 of 20X ohms and to terminal 8 of audio tone generator U41. The negative end of the capacitor C170 is connected to ground potential.

Capacitors C174 of .1 microfarad and capacitor C175 of 22 microfarads are connected from the positive 8 volt D.C.

power supply to ground.

52 1293~ The opposite side of the resistor R321, signal X, is connected to terminal 3 of operational amplifier U40B and to one side of a resistor R320 of 2 megohms. Terminal 2 of operational amplifier U40B iS connected to the wiper of a potentiometer, resistor R322 of lOK ohms and to the cathode of CR24. The anode of CR24 is connected to signal line E4. The one side of the potentiometer R322 is connected to the positive 8 volt D.C. regulated power supply, and the other side is connected to one side of a resistor R323 of 2K ohms and the other end of R319. The opposite side of the resistor R323 is connected to ground.

The opposite side of the resistor R320, signal Xl, is connected to terminal 1 of operational amplifier U40~, to one side of a resistor R331 of lOK ohms and to one side of a resistor R332 of 330 ohms. The opposlte side of the resistor R331, signal X2, is connected to the base of transistor Q30. The opposite side of the resistor R332, signal XlA, is connected to one side of indicator I2, the other side of which is connected to ground.

The emitter of transistor Q30 is connected directly to ground. The collector of transistor Q30, signal X3, is connected to one side of a resistor R335 of 6.8K ohms and to one side of a resistor R336 of 3.6K ohms. The opposite side of the resistor R335 is connected to ground potential.

The opposite side of the resistor R334, signal T, is connected to one side of a capacitor C171 of -.001 microfarads, to terminal S of the audio tone generator U41 and to one side a resistor R340 of 3.3K ohms. The opposite side of the resistor R340, signal Z6, is connected to one side of a resistor R339 of 2.2K ohms and to the collector of transistor Q34. The opposite side of the capacitor C171 53 12~3791 is connected to one side of the resistor R342 and to terminal 6 of the audio tone generator U41. Terminal 7 of audio tone generator U41 is connected to one side of a capacitor C172 of .01 microfarads. The opposite side of the capacitor C172 is connected to ground and to one side of a capacitor C173 of .01 microfarad. The opposite side of the capacitor C173 is connected to the negative 8 volt D.C. regulated power supply and to terminal 1 of the audio tone generator U41. Terminal 4, signal Tl, of the audio tone generator U41 is connected to one side of a capacitor C183 of .1 microfarads.

The opposite side of the capacitor C183 is connected to one side of a resistor R343 of lOK ohms. The oppGsite side of the resistor R343 is connected to one side of potentiometer resistor R344 of lOK ohms. The opposite side the potentiometer resistor R344 is connected to ground and to terminal 2 of operational amplifier U42. The wiper o~ potentiometer resistor R344 is connected to terminal 3 of power amplifier U42. Terminal 6 of power amplifier U42 is connected to the positive 8 volt D.C. regulated power supply. Terminal 4 of power amplifier U42 is connected to ground potential. Terminal 5 of power amplifier U42 is connected to one side of a resistor R345 of 10 ohms and one side of a capacitor C177 at 100 microfarads, The opposite side of the resistor R345 is connected to one side of a capacitor C176 of .047 microfarads. The other side of C176 is connected to ground.

The opposite side of the capacitor C177 provides signal T3.

The opposite side of the resistor R325, signal Y, is connected to terminal 10 of operational amplifier U40C and 54 1~379~ to one side o~ a resistor R324 of 2 megohms. Terminal 9 of operational amplifier U40C is connected to the wiper arm of a poten~i-ometer resistor R326 of 10K onms, and to cathode of CR25. The other side of CR25 is connected to E4. One side of the potentiometer resistor R326 is connected to the positive 8 volt D.C. regulateà power supply and the other side is connected to one side of a resistor R327 of l.5K ohms. The opposite side of the resistor R327 is connected to ground. The opposite end of the resistor R324 is connected to terminal 8 of operational amplifier U40C, signal Yl, ~M brake output, to the one side of a resistor R337 of 10K ohms, and one side of resistor R341 of 2K ohms and one side of a resistor R338 of 330 ohms. The opposite side of the resistor R337, signal Y2, is connected to the base of transistor Q31. The collector of transistor Q31, signal Y3, is connected to the other side of the resistor R336 and resistor R339. The opposite side of the resistor R338 is connected through indicator I3, the opposite side of which is connected to ground. The emitter of transistor Q31 is tied to ground.

The opposite side of resistor R341 is connected to the base of transistor Q32 signal Y4. The collector of transistor Q32 provide~ signal Y5. The emitter of transistor Q32 ls connected to ground potential. A diode CR29 has its cathode connected to the collector of transistor Q32 and its anode connected to ground potential.

Operational amplifier U39~ has terminal 12, signal F, connected to one side of a resistor R300 of lK ohm. The opposite side of the resistor R300 is connected to signal line B10. Terminal 4 of operational amplifier U39A is connected to the positive av DC.

Terminal 13 of operational amplifie~ U39A is connected to one side of a 1'~93'79~ resistor R302 of lOOK ohms, to one side of a capacitor C180 of .022 microfarads and to one side of a resistor R301 of lK ohms. Terminal 14 of operational amplifier U39A, signal Fl, is connected to one side of a resistor R305 of lOK ohms, to the cpposite side of resistor R302 and capacitor C180 and to one side of a resistor R303 of 2K ohms. Resistors R301 and R303 have their opposite sides connected to ground.

The opposite side of resistor R305, signal F2, is connected to terminal 9 of operational amplifier U39B.

Terminal 10 of operational amplifier U39B is connected to one side of a resistor n308 of 1 megohm and to the wiper of potentiometer resistor R304 of lOK ohms. Potentiometer resistor R304 is connected between the positive 8 volt D.C.

line and ground. The opposite side of resistor R308, slgnal F3, is connected to terminal 8 of operational amplifier U39~ and to the anode of diode CR27.

Terminal 6 of operational amplifier U39C, signal P2, is connected to one side of a resistor R309 of lOK ohms.

The opposite side of resistor R309, signal Pl, i9 connected to the positive side of a capacitor C181 of 1 microfarad, to one side of a resistor R307 of 15K ohms and to one side of a resistor R306 of lOK ohms. The opposite side of resistor R306 is connected to ground. The opposite side of resistor R307 is connected to the cathode of diode CR26.

The anode of diode CR26 is connected to the 12 volt D.C.

power source. The opposite side of capacitor C181 is connected to ground. Terminal S of operational amplifier U39C is connected to one side of a resistor R311 of lOK ohms to one side of a resistor R312 of 1 megohm and to one 56 lZ93791 side of R310 lOK ohms.

The otl)er side of resistor R310 is connected to ground. The opposite side of resistor R311 is connected to the the positive 8V DC. The opposite side of resistor R312, signal P3, is connected to terminal 7 of operational amplifier U39C and to the anode of diode CR28.

The positive side of a capacitor C182 of 22 microfarads is connected to the positive 8 volt D.C. line.

The negative side or the other side of capacitor C182 is connected to one side of a resistor R313 of l5K ohms, to the base of transistor Q35 and to one side oE a resistor R314 of 15K ohms. The opposite side of resistor R314 is connected to ground.

The opposite or the cathode side of diode CR27 is connected to the cathode of diode CR28, to one side Oe a resistor R315 of 2K ohms and to one side o~ a re~:istor R316 of lOK ohms. ~he opposite side of R316 is connected to ground. The opposite side oE resistor R315 is connected to the base of transistor Q36.

The emitters of transistors Q35 and Q36 are connected to ground.

Referring now specifically to Figure 6 the 12 volt car battery negative 211 is connected to ground and the positive pole 213 is connected to one side of the main vehicle power switch 215.

The opposite side of switch 302 provides 12 volt D.C. power source.

The output of the main power switch is connected to the anode of diode CR46, to the switched +12 volt line and to one side o~ a resistor R415 of 511 ohms. The opposite side of the resistor R415 is connected through indicator I6. The other side of the indicator I6 is connected to ground potential 211. The cathode of diode CR46 is connected to the positive side of 1~293791 a capacitors C203 and C204 of 10 microfarads, to terminal 1 of U52, U53 and U54. The opposite side of the capacitors C203 and C204 are connected to ground potential. Terminals 3 of V52 and U53 are connected to ground. Terminal 2 of U52 provides the +8V DC regulated source and terminal 2 of U53 provides the +5 volt D.C. regulated source. Also connected to the number 2 terminals is one side of capacitors C205 and C206 of 22 microfarad~. The opposite side of capacitors C205 and C206 are connected to ground potential.

Terminals 2 and 4 of the D.C. to D.C. convertor U54 are tied directly to ground potential. Terminal 3 of the U;4 is connected to terminal 1, the input of the minus 8 volt D.C. regulated power supply ~55 and to one side of a capacitor C207 of 22 microfarads. The opposite side of capacltor C207 i9 connected to ground potential. Terminal 2 of U55 provides the minus ~ volt D.C. regulated power source and i~ connected to ground through C208 of 22 microfarads.

Referring now to the schematic showing of Figs. 7A and 7B, the relative positions of Figs. 7A and 7B are shown in Fig. 7. The vehicle speed input signal S4 is connected to one side of a resistor R356 of lOK ohms to one side of n373 of 51.1K ohms, and to one side of a resistor ~358 of lR ohms. Tlle oppo~ite side of the resistor R356, signal FFlA, is connected to terminal 10 of operational amplifier U4aA and to one side of a resistor R357 of 2 meg ohms. Terminal 4 of operational amplifier U48A is connected directly to the positive 8 volt D.C. regulated supply.

Terminal 8 of operational amplifier U48A, signal FF2A, is connected to 58 1~93'~91 the other side of the resistor R357, to one side of a resistor R364 of 10K ohms and one side of a resistor R363 of 10K ohms.- Terminal 9 of operational amplifier U48A is connected to the wiper of potentiometer resistor R355 of 10K ohms. One end o~ potentiometer resistor R355 is connected to positive 8 volt regulated D.C, line. The opposite side of the resistor R355 is connected to ground.

A capacitor C193 of .01 microfarads is connected between the 8 volt D.C. regulated line and ground potential.

The opposite side of the resistor R358, signal FF 1, is connected to one side of a resistor R359 of 10K ohms and one side of a resistor R360 of 10K ohms. The opposite side of the resistor R359, signal FF2, is connected to terminal 6 of operational amplifier U48B and to one side of a resistor R362 of 10K ohms. The opposite side of the resistor R360 is connected to ground as is one side of a resistor R361 of 10K ohms. The opposite side of the resistor R361 is connected to terminal 5 of operational amplifier U48B. The opposite side of the resistor R362, signal FF3, is connected to terminal 7 of operational amplifier U48B and to terminal 1 of the high speed enable switch U49A.

The opposite side of the resistor R363 is connected to terminal 13 of the high speed enable switch U49A.

Terminal 2 of hi9h speed enable switch U49A, signal FF4, is connected to terminal 4 of a turning enable switch U49B and to one side of a resistor R367 of 10K ohms. A capacltor C194 of .01 microfarads is connected between the positive 8 volt D.C. regulated line and ground potential.

The oppo~ite side of the resistor R367 is connected to ground potential.

59 1~:93t791 Terminal 3 of the turning enable switch U49B, signal FF5, is connected to one side of a resistor R369 of 100K ohms and to one side of a resistor R370 of 10K ohms. Terminal 5 of turning enable switch U49B is connected to one side of a resistor R416 of 10K ohms. The other side of R370 is connected to ground.

Terminal 12 of operational amplifier U48D is connected to a resistor R403 of 10K ohms. The opposite side of the resistor R403 is connected to ground potential. One side of R404 of lR ohms is connected to ground and the other side signal DDl, is connected to one side of a resistor R405 of 10X ohms and to one side of a resistor ~406 of lK ohm. The opposite side of the resistor R405 is connected to the terminal 13 of operational amplifier U48D and to one side of a resistor R402 of 10K ohms. The opposite side of the resistor R406 is connected to one side of a resistor R401 of 10K ohms and provides the DD turning signal input.

The output terminal 14 signal DD2, of operational amplifier U48D is connected to terminals 8 and 11 of a low speed steering angle switch U49C and to the other side of the resistor R402.

The opposite side of resistor R401 is connected to terminal 3 of an operational amplifier U48C.

One side of a resistor R399 of 7.5K ohms is connected to the positive 8 volt regulated D.C. line. The opposite side of the resistor R399 is connected to one side of a resistor R400 of 47.5 ohms and to terminal 2 of operational amplifier U48C.

The opposite side of the resistor R400 is connected to ground potential. Terminal 11 of operational amplifier U48C is connected to the -8V DC as is one side of a resistor 1~365 of lOK ohms, to one side of a capacitor C196 lZ93791 of .01 micro farad, to one side o~ a capacitor C195 of .01 uF to one side of resistor R417 of 16.2K ohms, capacitor C201 of .01 micro farad, resistor R413 of lOK ohms to emitter of transistor Q42 and to resistor R414 of lOOK ohms. The opposite side of the capacitors C195, C196 and C201 are connected to ground potential. The output terminal 1, signal DDlA, of operational amplifier U48C is connected to the anode of a diode CR44 and to the other side of the resistor R416.

The opposite side of the resistor R364, signal FF3B, is connected to the base of transistor Q42 and to the other side of the resistor R365. The collector of transistor Q42, FF4A, is connected to one side of a resistor R366 of lOK ohms and to terminals 6 and 12 of low speed turn switch U49C. The opposite side of the resistor R366 is connected to the positive 8 volt D.C. regulated supply.

Terminal 7 of the low speed turn switch U49C is connected to the minus 8 volt regulated D.C. line.

Terminals 9 and 10 of low speed turn switch U49C is connected to one side of a potentiometer R368 of lOK ohms.

The opposite side of the potentiometer ~368 is connected to ground potential.

The other side of the resistor R369, signal N, is connected to one side of a resistor R371 of lOOK ohms, to one side of R381 of lOOR ohms, to one side of a resistor R393 of lOOK ohms, to one side of a resistor R395 of lOOK ohms, to one side of a resistor R407 of lOOK ohms, to the collector of transistor Q43, to one side of a resistor R408 of lOOK ohms and to one side of a resistor R394 of lOOK ohms. The opposite side of resistor R371, signal DD4, is 61 1~3';'~ connected to the wiper of potentiometer Q368, and the opposite side of R394, signal GG2, is connected to the wiper of potentiometer resistor R390.

The input from vacuum switch CC is connected to one side of a resistor R382 of lOOK ohms and to the anode of CR 39.

The opposite side of the resistor R382, signal CCl, is connected to one side of resistor R 386 of lOOK ohms, terminal 1 of U50 and terminal 13 of USl.

The opposite side of the resistor R386 is connected to ground potential.

Terminals 2 and terminals 5, signal BBl, of inverted brake circuit U50 are ccnnected to terminal 6 of U50, to one side of a resistor R387 of lOOK ohms and to one side of a resistor R3B4 of lOOK ohms. The opposite side of the resistor R384 is connected to the brake input switch, signal BB, and to the amode of CR40.

The other side of R387 is connected to ground.

The opposite side of the resistor R417, signal GGl, is connected to one side of a potentiometer R390 of lOK ohms and to one side of a resistor R388 of 16.2K ohms. The opposite side of the resistor R388, signal GG, is connected to terminal 3 of U50. Terminal 4 of U50, signal BB2, is connected to terminal 6 of look-ahead logic circuit U51.

Terminals 8, 9, 12 and 13 of circuit U50 are connected together and to the cathode of a diode CR44 and to one side of a resistor R418 of lOK ohms. The opposite side of the resistor R418 is connected to ground potential. Terminal 7 of inverte,r turning circuit U50 is connected to the opposite side of potentiometer R390, and to ground potential. Terminal 7 is also connected to one side of a capacitor C197 of .01 microfarads. The opposite side of the capacitor C197 is connected to terminal 14 of inverter 62 1~3791 turning circuit US0, to one side of a capacitor Cl99 of .01 microfarads, to terminal 14 oE look-ahead caution logic circuit U51, to one side of a capacitor C198 of .1 microfarads ,ahd to the positive ~ volt regulated D.C. line.

The opposite side of the capacitor C197 is connected to ground potential.

One side of potentiometer resistor R392 of 100K ohms, signal EEl, is connected to the anode of the diode CR42, to the negative side of C209 of 1 micro Earad.

The anode of CR42 is connected to terminal 7 of the lookahead caution logic circuit USl and to ground potential.

Terminals 1, 2, and 4 of look-ahead caution logic U51 are tied together.

Terminals 3 and 12 of look-ahead caution logic U51 are tied together.

Terminal 11 of look-ahead caution logic U51 is connected to the anode of a diode CR41 and to one side of the resistor R391 of 22 meg ohms.

The cathode of diode CR41 is connected to terminals ~ and 9 of the look-ahead caution loqic U51, to the opposite side of the resistor R391 and to the other side of capacitor C198. Terminal 10 of look-ahead caution logic U51 signal EE is tied to the other side of a capacitor C209.

The wiper of the potentiometer R392, signal EE2, is tied to the other side of R393. Terminals 10 and 11 of U50, signal DD3A, are connected to terminal 5 of U51.

Terminals 1, 2 and 4 are interconnected and termi nal 3 and 12 are interconnected on U51.

The opposite side of the resi~tor R395 is connected to terminal 3, signal Nl, of operational amplifier U47A.

Resistor R407 is connected the emitter of Q43.

The emitter of transistor Q43 is also connected to ground potential.

The base of the transistor Q43, signal YlA, is connected to one side of a resistor R410 of 10~ ohms.

The opposite side of the resistor R410 provides a Yl signal.

Tarminal 2 of 3~791 operational amplifier U47A is connected to one side of a resistor R397 of 33.2K ohms and to one side of a potentiometer resistor R396 of lOK ohms. The opposite end of the potentiometer resistor R396 and its wiper are connected to ground potential. The opposite side of the resistor R397 is connected to terminal 1 of operational amplifier U47A, signal N2, and to one side of a resistor R398 of lOOK ohms.

The opposite side of the resistor R398 which provides the V signal to the cathode of a diode CR43.

The anode of the diode CR43 is connected to ground potential.

The pendulum signal input AA is connected to one side of a resistor R414 of lOOK ohms and to the base of a transistor Q44.

The collector of the transistor Q44 is connected to the opposite side of the resistor R413, signal AAl, and to the cathode of a diode CR45.

The anode of the diode CR45, signal AA2, is connected to one side of a resistor R412 of 10 meg ohms, to one :3ide of a capacitor C202 of .047 microfarads and to one side of a resistor R411 of lOK ohms. The opposite side o~ the capacitor C202 and resistor R412 are connected to ground potential. The opposite side of the resistor R411 i9 connected to terminal S of operational amplifier U47B.

The terminal 6 of operational amplifier U47B is connected to output terminal 7, signal AA3, and to one side of a potentiometer resistor R409 of lOK ohms.

The opposite side of the potentiometer R409 is tied to ground potential. The wiper of the potentiometer R409, signal AA4, is tied to the other end of the resistor R408.

64 lZ~3~791 The opposite end of R381, signal HH5, is connected to the wiper of potentiometer resistor of R380 ofl0K ohms.

One side of potentiometer resistor n380, signal H~14, is connected to the cathode of CR38 and to one side of resistor R379 of 10K ohms. The anode of diode CR38 and the other end of potentiometer resistor R3~0 are connected to ground potential. The opposite side of resistor R379 is connected to the anode of diode CR37. The cathode of CR77, signal H~13, is connected to terminal 14 of U47D. Terminal 12 of U47D is connected to one side of resistor R377 of 5.11K ohms and one side of resistor R376 of 10K ohms. The opposite side of R377 is connected to ground potential.

Terminal 13 of U47D is connected to one side of resistors R378 of 10K ohrns, R383 of 20K ohms and resistor R385 of 10K ohms. The other side of R378 is connected to the -~V DC source. The other side of R3~6 is connected to ground potential. The opposite side o~ resistor R3~2 is connected to the cathode of CR39 and CR40.

The opposite side of R376, sicJnal Hl~l, is connected to terminal ~ of U47C and to the anode of diode CR36.

Terminal 11 of U47C is connected to the -~V DC supply.

Terminal 9 of U47C is connected to one side of resistors R374 of lK ohms and R372 of 51.1K ohr,ls. The other end of R3i4 is connected to ground potential. The other side of R372 is connected to the +5V DC source. Terminal 10 of U47C, signal llll, is connected to the other side of resistec R373 of 51.1K ohms and one side of resistor R375 of 10 Meg ohms. The opposite side o R375 is connected to the cathode of CR36.

3~ t~ The following is a list of the components used in the circuits discussed above:

Q# Transistors Devices Usaqe Ql 2N6111 PNP Series-Pass Regulator Q2 2N2222A NPN Current Limiter Q3 2N2222A NPN Feedback Control Q4 2N5771 PNP Level Translator Q5 2N2369A NPN Short Range Modulater Q6 2N2369A NPN Long Range Modulater Q7 2N3906 PNP Log-Linear Conv.

Q8 2N3906 PNP Log-Linear Conv.

Q9 2N3906 PNP Log-Linear Conv.

Q10 2N3906 PNP Log-Linear Conv.

Qll 2N2222A NPN 1 VDC Regulator Q12 2N2222A NPN Hysterisis Sw.

Q13 2N2907A PNP Level Translator Q14 2N2222A NPN Level Translator Q15 2N2g07A PNP Disable Switch Q16 2N2369A NPN Slope Inverter Q17 2N2222A NPN Disable Switch Q18 - Q26 NOT USED Q27 2N2369A NPN Slope Inverter Q28 2N2222A NPN Switch Q29 2N2907A PNP Level Translator Q30 2N2222A NPN Tone Switch Q31 2N2222A NPN Tone Switch Q32 MJE1101 NPN Dar.

Trans Brake Power Switch Q33 MJE1101 NPN Dar.

Trans Air-Bag Power Switch Q34 2N2222A NPN Tone Switch Q35 2N2222A NPN Power-Up Disable Sw.

Q36 2N2222A NPN Air-Bag Disable Sw.

Q37 - Q41 NOT USED Q42 2N2222A NPN Low Speed Enable Sw.

Q43 2N2222A NPN DM "SUM" Disable Sw.

Q44 2N2907A PNP Level Translator Ul NE566CN Function Gen. System Clock U2 MC14013BCP Type D Flip-Flop Gate Generater U3 MCI4Q~lBCP AND Gates Dual Diplex Driver U4 MC14082BCP AND Gates Channel 2 Control U5 MC14011BCP NAND Gates Inverter U6 MC14082BCP AND Gates Channel 1 Control U7 MC14066BCP Angl.

Switch Dual Diplex De-Mod U8 NE5532A Op-Amp Low Noise Pre-Amp U9 MF4-50 Low Pass Filter Low Pass Filter U10 MF4-50 Low Pass Filter Low Pass Filter Ull MF4-50 Low Pass Filter Low Pass Filter U12 MF4-50 Low Pass Filter Low Pass Filter 66 1~379~ U13A NE572 Analog Compdr.

Compressor Control U14A NE5S32A Op Amp Compressor Amp U15A NE572 Analog Compdr. Compressor Control U16A NE5532A Op Amp Compressor Amp U17A TL082C J-FET Op Amp 30DB Amp B U18A LM339N Volt Comparator Squaring Amp C ~ - ................. .. ..

D U19BA TL082C J-FET Op Amp 30D~ Amp U20A LM339N Volt Comparator Squaring Amp C . n D ~ n 1~ U21A NE5532A Op Amp DC Amp U22 MC14011BCP NAND Gates Logic Buffer U23 MC14011BCP NAND Gates Logic Sensor U24BA MC145538BCP n n n Pulse Generater U25 MC14013BCP Type D Flip-Flop Channel Comparator U26 MC14011BCP NAND Gates Phase Shift Detecter U27aA TL082C J-FET Op Amp Integrator Comparator U28 - U31 NOT USED U32A MC14011BCP NAND Gates Phase Shift Detecter U33AB MC14066BCP Analog Sw. Hold Switch C D U34A LM324N Op Amp Range Integrater B ~ n n DC Offset Amp Doppler Integrater D ~ .. Speed Integrater U35A MC14538BCP Prec.

Mono Multi Freq. to Analog Conv.

- n n U36BA LM324N Op Amp A-a Doppler Inter.

C " " " A-B Range Inter.

D " " " DC Offset Amp S7 37'~l U37A LM324N Op Amp DC Amp B C D " " " Main "SUM" Amp U38A LM324N -- Op Amp Doppler Amp B " " " A-B "SUM" Amp C " " " Doppler Comparator D " " " DC Amp .

U39A LM324N Op Amp S.S. DC Amp B " " " S.S.

Comparator C " " " Power Down Detector D " " " NOT USED U9OA LM324N Op Amp Warning Comparator B " " " Caution Comparator C " " " Brake Comparator D " " " Air-Bag Comparator U41 NE566CN Function Gen Audio Tone Gen.

U42 LM386N Power Amp Audio Power Amp U43 - U47 NOT USEn U47A ~L084C J-FET Op Amp D.M. "SUM" Amp B " " " " Pendulum Logic C " " " " Comparator D " " " " AND Gate U48A TL084C J-F~T Op Amp High Speed Comparator Speed Inverter C " " " " Turning Comparator D " " " " Turning Inverter U49A MC14066BCP Analog Sw. I~igh-Speed Enable Sw.

B " " " Turning Enable Sw.

C " .. Low-Speed Turn.

Sw.

D " " " NOT USED U50A MC14011BCP NAND Gates Inverted Turn B " " " Inverted Turn C " " " Inverted Brake D ' ~' , .................. Driver Under Cntl.

Logic U51 ~IC14011BCP NAND Gates Look-Ahead Caution Logic U52 MC78M08C Pos. V.

Reg. +8V DC Regulator U53 MC78M05C Pos. V.

Reg. +5V DC Regulator U54 Al-H12512/125W DC-DC Conv. Minus Voltage Supply U55 MC7908C Neg. V.

Reg. -8V DC Regulator ~LQde~ CRl, 21, 22 and CR36 are IN40n2 CR3 Zener Diode IN5239B All others are lN4148 68 1~'`?3';~1 Inputs Jl ~eavy Traffic Switch - J2 ~igh-Low Margin Switch J3 Wet Road Sensor Switch AA Rate Sensor-Pendulum B~ Brake Input CC Carburetor Vacuum Input DD Turning Sensor-Steering The following is a description of all the output indications of the radar system:

Il "WlB" is a light emitting diode which illuminates when the Warning channel is activated.

I2 "XlA" is a light emitting diode which illuminates when the Caution channel is activated.

I3 "YlA" is a light emitting diode which illuminates when the Brake channel is activated.

I4 "~3A" is a light emitting diode which illuminates when the Air-Bag channel is activated.

IS "B19A" is a light emitting diode which illuminates upon a Loss of Signal condition by the radar, which exceeds 30 seconds.

I6 is a light emitting diode ~pilot light) which illuminates when DC power is applied to the radar.

I7 "B12A" is a 1 ma panel meter which indicates the level of Signal Strength of a "radar target" in a DB above a no signal condition (80 D8 range).

I8 "K8" is a 1 ma panel meter which indicates the Range to the radar target in feet. (250 feet maximum).

I9 "D6" is a 1 ma panel meter which indicates the Doppler closing rate.

69 ~Z~3~ I10 ~S7~ is a 1 ma panel meter which indicates vehicle speed.

Ill "VIA" is a 1 ma panel meter which indicates "sum" voltage. tdegree of danger) I12 "KA4A" is a l ma panel meter which indicates long range channel in feet. (0-5000 feet) I13 "E5" is a light emitting diode which illuminates when a target is moving away from the vehicle.

~Directional Doppler) I14 "KA~" is a light emitting diode which illuminates when a target is greater than 250 feet away from the vehicle.

INPUTS The following i~ a description of the inputs other than from the radar sensing.

Auto Speed NS~ Input This input normally comes from the car's cruise control circuit. The input is 12 volts in amplitude and switches on and off approximately every 24 inches.

This input can read any pulse waveform 5 volts in amplitude or higher and converts to MPH.

Vacuum Input "CC" The vacuum switch input is activated by the car's motor vacuum system. When the vacuum is high the switch is closed and supplies 12VDC to point "CC". ~igh vacuum is 3 PSI (or more) of vacuum suction and when the vacuum is low 1~3'~C~l or below 3 PSI the vacuum switch is open providing 0 volts.

A car's engine has low vacuum when the motor is working or ac'celerating and it has a high vacuum when the car's accelerator is not depressed. The carburetor's butter-fly valve, when open, causes the vacuum to drop or go low and vice-versa.

Brake InPut "BB" The brake input "BB" is the same 12VDC that is used for the brake stop lights on the rear of the car. When the brakes are applied, you are slowing the car, and informing the radar system that you are doing so. The radar's influence is modified so that it will not interfere with what the driver.

Pendulum Input ~-AA" The pendulum switch is activated only by and during a sudden turn by the vehicle. The pendulum senses only a sudden change in the vehicle direction of travel and quickly returns to its normal position ~off) when the vehicle ceases the turning movement. When a quick turn is made, point "AA" is switched to ground by the pendulum action and this action tells the radar that the car is turning in a sudden or evasive manner.

Turning In~t ~DD" Point "DD" is connected to six resistors in series that are individually by-passed by six switches which are activated when the car's steering wheel is turned up to 360.

This string of resistors is connected to +8V at one end and to point "DD" at the other end.

1~37~1 When the steering wheel is rotated (L or R) 30, the first switch is connected to the string of slx resistors.

Tllis first step will modify the radar's safe zone about 6 feet and the other switches do likewise. This will modify or decrease the safety zone in turns and will prevent or ignore unwanted warnings. The second switch is turned on and by-passes the first resistor and this action continues as the steering wheel continues to be turned. The Eorth switcll is activated at 180, the fifth at 270 and the sixth switch at 3~0.

The number of switches and resistors can be increased as necessary. There are twelve switching steps (left and right) and these switches can be used for other turning considerations.

Antenna Turning When a car is not travelling a straight course it is turning in a curved pathway, or in a circle.

The radar's narrow beam is called a pencil beam because its shape is straight and cannot be curved.

When a car is turning it appears to be going straight but it is not. The real direction of travel is determined by the tire angle with respect to the car's body. For the Radar Collision Avoidance System to be effective in turns, it must look to a point on a precise chord-line to intersect the circular pathway to see where the car wlll be going.

The antenna's turning with the, angle of turn and the car's speed are combined to give a complex modification of the straight driving algorithm. An example is: if a car 72 lZ~3791 is going 10 MPH and the steering wheel is turned 45, the logic zone is brought in (shortened) by 10 feet from its usual 30 feet. At 50 MPH on a slightly curved freeway if the steering wheel angle is 15, turn the zone is reduced to 100 feet (straight travel is 150 feet).

Fig. 8 depicts the turning switch 246 for producing the turninq signal DD. The switch comprises a plastic mounting plate 248 and a control arm 250, the control arm 250 somewhat resembling a paddle. The outer portion 252 of the control arm includes a plurality of apertures 254. A cable 256 is attached to the automobile steering tier rod~ not shown, and cable 258 is connected to a spring bias, not shown. These cables are connected to the same aperture.

The proper aperture 254 is selected that provides the required turning to wheel direction for a given automobile.

The control arm 250 is constructed of an electrically conductive material such as, for example, brass, copper or the like. The center of the control arm has an opening 259 assembling generally the shape of a bottle. The control arm is pivotally attached to the plastic mounting plate 248 by means of plvot 260. Electrical contacts 262-1 througl- 6 are mounted on the mounting plate beneath the opening. The rotation of control arm 250 cause4 the control arm to progressively engage switch contacts 262-1 through 6. The switch contacts, see Fig. 9, in conjunction with resistors RS00 through RS12 act as a voltage divider between the +8VDC source and signal point DD. The shape of the opening 259 and the value of the resistors R500 and R512 provide the required voltage output at DD for a given turning radius.

37~31 Fig. 10 depicts the pendulum switch 264 which provides signal AA. The switch 264 comprises a micro-switch 266 in conjunction with a pendulum weight 268. The switch and pendulum are mounted vertically on the vehicle at any convenient location near the radar system. A pair of stops 270 and 272 are employed to prevent excessive pendulum swing. The pendulum weight 268 is pivotable about pivot point 274. When the pendulum weight is caused to pivot about 274, cams 276 and 278 cause the switch activating arm 280 to close the switch to its on position and connect signal AA to vehicle ground.

Operation of The Invention The automotive radar system of the invention is a CW diplexed Doppler radar that operates at a frequency of 10.525 or 24.125 GHZ. The radar R.F. power output is approximately 10 milli-watts (mw) and provides and operating range of 220 feet and a maximum range of 2000 feet.

The antenna 48 has a shaped beam width of six degrees that is designed to cover one lane of roadway. The radar of the invention is designed to improve dri~ing safety by warning the driver before imminent collision, partially brake the car if danger exceeds a predetermined condition and finally, activates air bag deplo~ment when a high speed collision is certain.

The Radar system is made up of three major assemblies;

the antenna assembly 22, the main signal processor unit 20 and the output monitor 42. The antenna assembly consists of a microwave antenna, a 10.525 GHZ transceiver, and a printed circuit board which contains the Gunn-diode modulator 56, a low noise preamplifier 66, a system clock 52, a dual diplex generator 54, de-modulator switches 94 12~3791 100 and the low pass filters 102A-102D. The transceiver contains a Gunn diode transmitter 58, a receiver Schottky barrier diode receiver 64, a waveguide coupler /circulator 60 and an RF load 62. The transceiver uses a "zero" frequency IF to obtain the Doppler dif~erence frequencies.

The Gunn diode 58 is frequency modulated with a 125 KHZ wave form and deviated 62 KHZ peak to peak (P-P) and also 983 KHZ P-P. This modulation deviation produces a range of 5000 feet for a 180 degree phase shift for the long range channel and 250 feet for the short range channel and a Doppler freguency of 31.4 HZ/MPI~. rhe Schottky diode receiver 64 in the receiver portion of the transceiver is biased to 100 millivolts D.C. by adjusting a screw into the waveguide tnot shown). The output signal of the receiver 64 is fed through a co-axial cable to a low noise preamplifier (signal point "A"). The low noise pre-amplifier (U8) has a gain of 20 DB and a noise figure of 1.5 DB at its output "A4".

The system clock ~Ul and Q4) generates a 250 KHZ square-wave 10 volt P-P signal at its output M3. Signal M~ i~ fed to the low pa~s filters (U9, 10, 11 and 12) whose "corner frequency" is determined by dividing the clock frequency by fifty (5 KHZ). Signal M3 is also fed to the gate generator ~U2) which produces the modulating pulse 4 micro seconds ~us) wide at M4. The "long" range gate at M4~ and also the "short" range gate at M4A are 8 us wide.

The dual diplex driver ~U3) takes the modulating pulse and both range gates and provides the proper modulation waveforms M6 and M6A to the gunn diode modulator ~Q5 and 6). The output of the long range modulator (Q6) is adjusted for 5000 feet range and the short range modulator (Q5) for 250 feet. The channel "2" (U4) control takes the 1~93~ modulating pulse, both range gates, and the B16 threshold signal and produces the proper de-modulation waveforms ~or both "CH. 2's" (long and short range) to the dual diplex de-modulator (U7) M9 and M10.

Signals M9 and M10 are also fed to the inverter (U5) and at its outputs Mll and M12 are supplied to the channel "1" control (U6) along with the thre~hold signal B16 and both range gate signals (M4A and M4B). The~e signals are then used to produce the proper de-modulation waveforms M13 and M14 for control of both "CH. l's" (long and short range) to the dual diplex de-modulator (U7), along with the input signal A4. The de-modulator (U7) then separates the input signal A4 into four channels (long and short range CH. 1 and C~. 2) signals A5, A5A, ASB and ASC are then filtered by the low pass filters (U9, U10, Ull and U12) to remove the diplex freguency since that is no longer required.

The log amp circuit consists of a low pass filter between signal A4 and Bl with a -6 DB point of 20 K~JZ and roll-off of 24 DB/octave, a DC amplifier 74 (Bll to B12), a thre~hold detector 76 (B13 to B16), and a loq-to-linear converter 70 (Q7 to Qll) (which is a symmetrical signal limiter amplifier). This amplifier is adjusted for proper operation by setting (R43) for equal voltages across emitter to collector, as compared with the emitter and collector resistors. The log-to-linear conversion is accomplished by summing the base current o~ each stage in a common sum line B8. The gain of each stage is approximately 20 DB ~ 80 DB total) and as each stage reaches limiting there is no further increase in its base current into the sum line B8. The low pass filter on the sum line 76 3~7~3~ (C42, R45, and R46) reduces the ripple due to Doppler signal feed-through at 6 DB/octave above 70 HZ.

The output level at ~12 is adjusted to zero V DC with R49 for a no signal input at "A". The accuracy of the log amp from 10 uv to 100 mv input "A" is +- 5~. The DC amplifier (U21, A, B) has 40 DB gain, and its output will change 1 volt with each 20 D~ change in signal strength.

The threshold detector (Q12 and Q13) will change state at ~16 from -8V DC to +8V DC when +0.5V DC is reached at B12, which would occur when there is a 30 uv or greater signal at the input A. The output of the threshold detector B16 is divided and applied to both the logic sensor and the threshold switches. The logic sensor (U22 and U23) generates two timing functions, a hold signal 819 which changes state from ~8V DC to -8V DC only when the signal drops below the threshold at B12 (for up to a maximum of 500 milllseconds), and a los~ of signal output ~19A when the input B12 stays below the threshold (no signal) for more than 30 seconds it will then supply 15 mA of current into a light emitting diode (I5) 82.

The compressor amps (Ul3, 14, 15 and 16) from A7, A, B and C to A9, A, B and C are used to control the 80 DB dynamic range of the input-signal to output signal change of 40 DB. This improves the speed and accuracy of processing Doppler and range information under all signal dynamic conditions. Each has a variable gain range of -6 DB to +45 DB and an attack time of 400 microseconds and a decay time of 40 milliseconds. The overall frequency response of the amplifier is 10 HZ to 15 KHZ +1 to -3 DB.

Each amplifier has a zero adjust R71, R99, R129, and R154 to set their outputs A9, A, ~ and C respectively to zero V 3'7~ DC, for greatest dynamic range.

The gain of each stage is controlled by U13 and U15 (A or B) which acts as a variable feedback resistor connected across U14 or U15. A one meg ohm resistor is also used as a feedback resistor to limit the maximum gain of each stage to 45 DB.

The amps (U17 and 19) from A9, A, B and C to A14, A, B and C provide the additional gain required to process range and Doppler data, for signals as low as 30uv at signal point "A" (30 DB gain).

The squaring amps (Ula and 20) from A14, A, B and C to A17, A, B and C produce precision "square-waves" from the input waveform (sine, triangle and etc.) and have a 40 DB dynamic range.

The negative "hysterisis" point for each squaring an~p is adjusted by R79, 107, 138 and 163 respectively.

At this point the short range (A17 and A17A), the Doppler output (A17D) and the long range (A17B and A17C) are split into separate channels for different processing.

The directional Doppler detector (U24, U25 and Q15) consists of a timing pulqe generator (U24), a channel comparator (U25) and a disable switch (Q15) which is used to determine which direction a "target" is moving (either opening or closing range).

The signal inputs are A17 and A17A, and the `output E4 (will be discussed later).

The long range channel (A17B and A17C) conqists of 180 phase detector (U26) and its output KA is combined with the inverted threshold signal 816 at the input o~ the slope inverter (Q16).

78 l~s;~3~gl The output of the slope inverter (Q16) KA2 is fed to the long range integrator (U27A) it produces a voltage proportional to range (5vDC for zero range and OvDC for 5000 feet) at its output KA4. The long range comparator (U27B) and range disable switch (Q17) is set to activate for any range reading of 250 feet or greater (4.75vDC) by R178. Range disable output K4 will be discussed later.

The next blocks consist of the short range phase detector 91, slope inverter 90, range hold switch 84, range integrator, DC offset amplifier, range DC amp, and the range meter output. First the input signals A17 and A17A are fed to the range phase detector (U32). The phase detector 91 is comprised of four nand gates that produce a 0 to 180 degree phase shift. It has maximum output (+5V DC) at 180 degree phase shift between the input signals A17 and A17A. This corresponds to a range o~ 250 feet.

The slope inverter 90 tQ27) takes the range input Al9 and inverts it, to have maximum output (+5V DC) at zero range. Also fed to Al9 is a threshold signal 821, which insures that point K ls always zero V DC (maximum range) with no usable signal at input point A.

From the output of the inverter at R, the signal is fed through R208 to the range hold switch 84 and to C145.

The purpose of the range hold switch (U33A) is, as its name implies, to hold the last range information voltage for up to 500 milliseconds when there is a momentary signal loss.

The Doppler hold switch, (U33B) also holds the last Doppler speed information when there is momentary signal loss. The hold switches U33A and U33B are controlled by the threshold detector Bl9 (hold signal).

79 3'791 The signal voltage at the output of range hold switch Kl is then filtered by the range integrator (U34A) which has a -6 DB corner frequency of 10 hertz and a 12 DB/ octave roll off at K4.

The long range disable input is also fed in at circuit point K4 (operation discussed previously).

The DC offset amp (U34B) i9 adjusted by R214 for zero VDC Q 220 feet of range at its output K5.

The range DC amp (U37A) iq adjusted by R220 for +4 VDC at K7 for zero range.

The output }~7 is fed to the range meter (I8), and to the algorithm sum point V where it will be summed with the Doppler closing ra~e DS, vehicle speed S6, and the output of the driving monitor 196.

The range channel accuracy is + or -2% of full scale.

The Doppler channel signal A17D consists of a frequency to analog convertor U35A, a Doppler hold switch U33B, Doppler integrator U34C, a DC amp U37B and a Doppler meter output D5.

The input signal A17D to the frequency to analog convertor (U35A) produces a 150 microsecond wide pulse at point D, for every leading edge of the input square wave, and then integrates it into a DC voltage proportional to the input frequency at point D3.

The Doppler hold switch 86 (U33~) operate3 in the same manner as the range hold switch except that it is holding the last Doppler voltage present at Dl.

The Doppler integrator (U34C) filters the signal voltage Dl, and has a -6 DB corner frequency of 10 hertz 3~ and a 12 DB/octave roll off at D3. The output at D3 is fed to the Doppler DC amp.

The output level of the DC amp (U37B) is set with R232 to provide the necessary voltage at D5 required for the Doppler portion of the sum algorithm at point V. The output of the DC amp D5 is also fed to the Doppler meter I9. Full scale reading of the Doppler channel is 210 mph, with an accuracy of + or -2~.

The next channel is vehicle speed which consists of the frequency to analog convertor 156 (U35B~, speed integrator 160 (U35D), a DC amp 162 (U3~C), and an output to the vehicle speed meter. The input S, vehicle speed, comes from the output of the car cruise control circuit.

The frequency to analog convertor (U35~) will handle any input voltage waveform S and convert it to zero to +5 Volt level at Sl. The output of the convertor S2 will produce a 10 millisecond wide pulse 5 volts in amplitude, for every leading edge of the speed waveform voltage.

The speed integrator 160 (U34D) filters the signal voltage S2 and has a -6 DB corner frequency of 2 hertz with a 12 DB/octave roll off at its output S4. The output is the~ fed to the DC amp (U37D~ and driving monltor input S4.

The output level of the DC amp (U37C) is set with R252 to provide the necessary voltage at S6 for the vehicle speed portion of the sum algorithm, at point V. The output of the DC amp S6 Is also fed to the vehicle speed meter I10. The full scale accuracy of the vehicle speed channel is dependent on the speed transducer and tire wear, as well as the circuit accuracy. The speed circuit accuracy is + ~1 3'~ or -2~ oÇ full scale reading.

The sum point V (sum algorithm equivalent to danger level) i9 buffered by the sum amp (U37D) into the sum monitor test point Vl. NOTE: (The air bag deployment is a separate channel and is not degraded by either the driving monitor sum input or by Jl). At point V2 the sum voltage can be lowered by Jl ~a ~'driver" option switch, Heavy Trafflc) which can be used in heavy traffic to degrade the warning and danger audio tone trip levels under close traffic conditions. The input sen~or Jl affects only the caution and warning tones settings and not the brake control or its audio tone.

From point V2 the sum voltage is fed to the warning comparator (U40~) and R319 adjusts the input voltage trip point (all sensors off). The output oF the comparator Wl is split three way~. The first route is to the warning LED (Il), then to an optional cruise control disable switch and the third route is to activate the power switch (Q28 and Q29) which supplies +8 VDC to the audio tone generator (U41).

The directional Doppler input E4 is fed to the warning comparator ~U40A) through CR23, the caution comparator (U40s) through CR24 and the brake comparator tU40C) through CR25. Signal E4 i~ used to disable the comparators whenever the "target" i-~ moving away from the antenna.

The audio tone generator produces a frequency of 400 HZ when it is first turned on. The voltage at point T controls the frequency of the tone, and when the caution level switch (Q30) is turned on the tone will increase to 37~31 1000 HZ and when the bra~ing switch (Q~l) is turned on the tone will be 2.1 KHZ, and when the air bag switch (Q34) is turned on the tone will be 3 KHZ.

The selected audio tone at point Tl is fed to a volume control ~344 and then to the audio power amplifier ~U42) where it is amplified up to 500 milliwatts. Then the signal is coupled to point T3, where it will be connected to an 8 ohm speaker.

Also from point V2 the sum voltage is fed to the caution comparator (U40B), and the trip point for the input is set by R322. The output Xl of this comparator is divided and fed to the caution LED I12 and it is also fed to the caution tone switch (Q30), as previously discussed.

From point Vl the sum voltage is fed to the braking comparator (U40C) and the trip point for its input is set by R326. The output of this comparator Yl is split four ways. The first route is to the brake LED I3, then to the brake power switch ~Q32), which can handle 4 amps of DC current. The third route from Yl is tG the brake switch ~Q31) that changes the tone as previously di~cussed. The fourth is to the "DM" brake input Yl.

The air bag channel i9 unique in that it has high speed Doppler and Range active integrators. The reason for this is that the normal integrators employed in the main Doppler and range channels have a 100 milli-second delay as compared to ten milliseconds (ten times faster~ delay for the high speed integrators. This is important when ti~e time ~actor of the air bag deployment is initiated at 200 milliseconds before impending collision at a closing rate of 35 mph and higher. The high speed integrators were not 83 12~3~;9~ used in the main Doppler and range channels because at speeds below 10 mph, too much ripple is pre~ent for good accurate processing. The air bag Doppler channel consists of a Doppler integrator, a DC amp, a Doppler amp, and a Doppler comparator. The Doppler integrator (U36A) receives its input from point D, the output of U35A which is composed of 150 micro-second wide pulses.

The integrator has a time constant of 10 milli-seconds and has a voltage proportional to the Doppler rate at its output G2. The voltage level at the output of the DC amp (U36B) is adjusted by R265 to a value of +4 volts G4 at a Doppler rate equivalent to 200 mph. Then R280 is adjusted at a 35 mph input from A17D for an output trip point at G713 in the Doppler comparator (U38C).

The resulting voltage step of 0.75 VDC at G8B is then fed to the air bag sum point Z.

The Doppler amp (U38A) receives an input G5A from R280 and its output GkA is routed to the air bag sum point Z. The air bag range channel consists of a range integrator 85, a DC offset amp 87 and a DC amp 126.

The range integrator (U36C) receives its input from the range slope inverter 90 at point R and its output H2 is voltage proportional to range (0 to 250 feet). The voltage level, signal H3, is then fed to the DC offset amp (U36D), whose output H4 is adjusted the same as the amp (U34B) in the main range channel, except that R272 is adjusted for 0 VDC Q 200 feet of range. The range DC amp (U38D) is adjusted by R277 for an output H6 of 4 VDC @ zero-range. The output H6 is then fed to sum point Z. The operation of the air-bag sum amp 132 is as follows: Point Z has three inputs; a step voltage at speeds 35 mph or greater closing rate; a Doppler closing rate input; and a range input. From these inputs it is determined that when the air bag comparator (U40D) output Z3 is adjusted with R295 to trip for the condition 84 12937~1 of 35 mph (or higher) closing rates and a range of 10 feet minimum (equal to 200 milliseconds from impending collision), so that no air bag deployment will occur below 35 mph.

Above 35 mph the air baq will start deployment at 200 milliseconds before impending collision up to 210 mph closing rates.

From point z3 the signal is split three ways; the first is routed to the air bag LED I4, and then to the air bag power switch 138 (Q33) that can switch 4 amps of DC current and finally to the air bag tone switch (Q34) as discussed previously.

The last portion of air bag channel consists of a signal strength DC amp 88 (U39A), a DC power-up disable 202 (Q35), and a disable switch 186 (Q36) and a power down detector (U39C).

The signal strength input B10 is used in the air bag channel to prevent fa~se-triggering or air bag deployment for targets smaller than a motorcycle (such as flying birds, blowing debris, balls, etc.).

These small targets usually would not injure the vehicles' pa~sengers; nor would the air bag help in these situations.

The S.S. DC amp 88 (U3~A) is a high-speed version of U21B and its output Fl drives the S.S.

Comp. 202 (U39B).

The S.S.

Comp. is adjusted with R304.

The signal voltage at F3 ranges from 6.5 VDC with small or no targets to zero VDC with large ones and is fed to the disable switch (Q36) which controls the air bag power switch 138 (Q33) at point Z4.

When the radar is first turned on the DC power-up disable 190 ~Q35) will keep point Z4 shorted-out for onehalf second until the radar circuitry is stabilized.

When the radar is turned off or there is a large negative going transient on the vehicles' 12 volt system; point P monitors the DC drops below 10.5 VDC, the output P3 of the DC powerdown detector (U39C) will go positive (6.5 VDC) and short 1~3~out point Z4 through the disable switch 198 (Q36).

The driving monitor circuits of Figs. 7A-7D are as the name implies. The circuits monitor degree and rate of turn, vehicle speed~, braking, rollinq and acceleration.

Any operations that a driver initiates can be an input, weighted as required in magnitude and duration. If a vehicle is going straight at 55 mph in a normal safe manner, the driving monitor (DM) output N2 would be zero.

The driving monitor circuit has two radar inputs. They are the vehicle speed input S4 and the radar brake input Yl.

The driving monitor circuit also has four inputs from the vehicle. They are the steering angle DD, the vacuum switch CC, the brake switch BB, and the pendulum switch AA. The DM sum output N2 goes into point V, the main sum point.

The purpose of the driving-monitor circuit is to take into account the vehicle's attitude, the driving responses and the radar outputs S4 and Yl. Then a determination is made whether or not to modify the sum main voltage at point V.

Under controlled or less dangerous conditions the sum voltage V will be lowered ~driver braking, turning, or evasive-maneuver). This allows for a decreased safety zone, when it's determined that the driver has the vehicle under control. There is a condition when the safety zone is increased momentarily, and that is when the vacuum CC goes to maximum and there is no braking BB or steering DD input for two seconds. This will cause the radar to lookahead for any impending dangers that the driver may not be fully aware of.

The following paragraphs will explain the operation of the driving-monitor circuits. The first being the low speed steeriDg circuit (U48A, U48B, U49C and Q42~. ~or vehicle speeds less than 30 mph the circuit will cause a 86 12~3'~91 decrease in the safety zone of 6 to 30 feet of range, for a vehicle tire steering angle change of from 1 to 30. When a vehicle is turning, it is departing from a straight course, therefore its "safe-zone" would now be longer than necessary. This change is in six discrete steps as the angle increases from zero degrees ~straight ahead). The circuit is enabled (below 30 mph) by the low-speed enable switch (Q42), signal FF4A, to be hereinafter described.

The input steering angle voltage DD is connected to terminal 13 of the steering angle inverter (U48D) producing a negative voltage DD2, then to the low speed steering apgle switch (U49C) which is controlled by the low speed enable switch (Q42) herein- before described. The output level at terminal 1 of uqgc, DD3, is adjusted by R368, to produce signal DD4 which is fed through R 371 to the DM sum line N. The high speed turning circuit (U48A, U48B, U49A and U49B) will produce a variable safety zone signal by subtracting the vehicle speed voltage signal from the main sum algorithm V (refer to drawing of Figure 12) in turns with vehicle speeds greater than 30 mph. The vehicle speed input S4 is fed into the high speed comparator (U48A), as signal FFlA, and its output signal FF2A is adjusted by R355 to trip at a vehicle speed equal to 30 mph. This output FF2A controls the low speed enable switch (Q42) discussed above and the high speed enable switch ~U49A).

The output signal FF3 from speed inverter (U48B) is fed into the high speed enable switch (U49A) terminal 1 as signal FF3 described above. The inverted vehicle speed voltage FF4 is then fed to the turning enable switch (U49B) which is turned on ~y the steering angle comparator (U23D) signal DDlA whenever the steering input DD senses a turn. The output at terminal 11 of the turning enable switch (U49B), FF5, is also fed to the DM sum line N through R369.

1~,93~ The look-ahead caution logic (USl) has three inputs; the vacuum switch signal CCl, the inverted brake input ~US0) BB2, and the inverted steering (U50) DD3A.

The purpose of the look-ahead caution logic is to produce a positive pulse at its output signal EEl 1100 milliseconds in duration) when th~ vacuum goes to maximum level CC and stays there for at least two seconds, when there is no input from either the inverted brake B82 or the inverted steering DD3A.

The output EEl is adjusted by R392 to produce a increase in the safety zone of 30 feet.

The driver under control logic (1/4 of US0~, will produce an output GG, when both the brake BB and the vacuum switch CC are activated (which indicates the driver is responding to a danger before the radar does). The output is adjusted by R390, GG2, to produce a decrease in the safety zone of 15 feet.

The next block is the slow speed modifier (U47C and U4iD) which is used to de-grade the warning and brake levels at vehicle speeds (S4) of 3 MP~ or less. The inputs used are S4 to the slow speed comparator (U47C) and either or both vacuum (CC) and brake (BB) signals to the AND gate (U47D).

The negative output ~H4 is adjusted with R380 to produce -0.5VDC signal at HHS.

The sum line N has six inputs FF5, DD4, ~E2, HH5, GG2 and AA4. The sum line N also has an input from the DM sum di~able switch (~43), which will short out all the inputs when the radar activates the vehicle's brakes Yl.

The DM sum amp (U47C) is adjusted by ~396 with only the high speed turning circuit signal FF5 activated, to an equal negative voltage at its output N2 as compared with S6 88 1;~93791 (output of the vehicle speed DC amp (U17C) output). The output N2 is then fed to the main sum point V.

The DC power supply consists of a DC-DC converter (U54), a -8 VDC regulator ~U55), A +8 VDC regulator (U52), and a +5 VDC regulator (~53). The front end assembly has a separate -~10 VDC regulator for supplying lower noise voltage to the pre-amp and modulator circuits. The above reg'ulators supply power to all the circuits of the radar.

The antenna 48 is isolation mounted to the vehicle and is rotated by the steering linkage through +25 degrees so the radar can see in the directions of vehicle travel.

When a vehicle is turning it is traveling the circumference of a circle. ~n turns the antenna beam is aimed ahead at a point further around the circle. The antenna steering angle is approximately one and one half times the tire angle.

Referring now to the graph of Fig. 11. The vertical or ~Y" axis is represented by voltage in the range of 0 volts at the bottom to 6.5 volts at the top. The horizontal or "X" axis represents speed in mph and distance from an object in feet. Two different scales are used along the "X" axis. One scale represents warning and vehicle braking and the other represents air bag deployment. The radar operational parameters fall within the bounds of the graphs of Figs. 11 and 12. Information outside of the graph parameter are not considered important to the radar operation and are accordingly disregarded.

The auto radar of the invention operates on a "safe zone" concept which is a selected analytical voltage level algorithm that provides a typical safe driving distance 1~3791 margin for the vehicle to stop before impact. That is, the distance needed to stop a car in controllable situations.

The algorithm is the sum total of five or more voltage inputs to the radar system that can make driving safer as will be shown below. The primary algorithm is for the warning and braking functions. The air bag algorithm is a special high speed algorithm and it will be described last.

The algorithm's main inputs are distance, speeds, turning rates, driving patterns and time. These inputs are converted to voltage levels ~or further processing and the desired results provide adequate stopping distances or margins and time before possible impact so the driver can avoid the collision.

A.

Sum Voltage Vs Vs=Vr+Va+Vg-Vdm. A safe (totals) level is set below 4V and a dangerous level above 4V.

8.

Range Voltage Vr l-as values from zero volts (distance) at 220' and up to 4 volts at zero range.

C.

Doppler Voltage Va has values from zero volts (closing rate) up to about 2.1 volts at 73 mph.

D.

Car Speed Voltage Vg approximately the same value (gnd sp.) range as Va above E.

Driving Monitor Inputs 1) Turning Angle (DD) VDM is zero volts when going 2) Turning Rate (AA) straight and ranges from 3) Vehicle Speed (S4) +.5 volts to -2.5 volts 4) Vehicle Acceleration (CC) when turning 5) Vehicle Braking (BB) 6) Radar Braking (Yl) Doppler voltage can be either a closing or opening rate. Doppler opening rates are not considered because the warning, caution, and brake comparators ~U40) are disabled by the directional Doppler signal E4.

1;~93791 Fig, 11 is a graph presentation of the system operation. In the Fig. 11 graph, the "safe zone" ends at Vs = 4 volts and the danger ~one begins at Vs = 4 volts.

Vr can be from 4 volts at zero range to 0 volts at 220 feet. Va can be from 0 volts at zel~o mph and up to 2.1 volts at 73 mph.

Vg is the ground speed the car is traveling and it can range from 0 volts up to 1.9 volts at 73 mph.

When using the graph of Fig. 11 keep in mind that one volt equals 55 feet or 36 mph. When using the graph to work a problem, the answer will be in volts and must be transposed from volts to feet or mph to get the margin or safe zone before impact. I use the relationship where Distance (D) equals Rate (R), times Time (T) and the units of distance, speed or time can be transposed and vice versa. D = R x T and Feet = Speed x Seconds. The various units are normalized electronically and converted into volts. The average time (in seconds) before impact is assumed to be about one second at slow speeds, about two seconds at moderate speeds and three or more seconds at high speeds. If the vehicle operator is alerted seconds before impact and has more time or stopping distance to control the vehicle it is believed tllat an accident could be avoided or its consequences greatly reduced in all normal driving situations.

In the air bag portion AB of the sllowing of Fig. 11, VBs - VR + VBA - voltage Bag Sum. The air bag activation signal is initiated at 4.65V. VBA is the high speed approaching rate voltage used to activate the air bag activation signal .2 seconds prior to impact. The air bag algorithm sum voltage (Vbs) operates on the same principal a~ the safe zone algorithm. Since the air bag's demanding requirement~ are quite different and must be deployed at 91 .

1293791 high speeds, short ranges (10 Ceet-60 feet) and high closing rates (35-204 mph) the algorithm is tailored to handle these situations. A special closing rate voltage curve (Vba) is used with the range curve (Vr) in order to determine the air-bag sum voltage which activates the air bag.

The Vba voltage value can be 0 to l.9V and Vr values used for air-bag deployment are normally between 3 and 4 volts.

Figs. 13 and 14 depict Fig. 12, saw-tooth slopes and lines that represent the primary Vr and ambiguous range returns Vl, 2, etc.

Two Vr range slopes are used.

The primary short range (SR) Vr is used from 0' to 250' and the secondary long range (LR) VR is used to disarm the radar from about 250' to 9750'. Now note that we use the first SR Vr range voltage slope from 0 feet, which is 4 V and 250 feet, which would be 0 V.

The other ambiguous range slopes will cause some problem of false range return when the radar actually looks at large targets beyond 250'.

The primary SR range slope is used for collision warning, braking and air-bag deployment and the second LR slope is used to confirm the closeness (within 250') of the target and to prevent the SR ambiguous range return from giving us fake returns from 250' to 9750'. The second, LR, Vr voltage slope is 4 V at 0 feet and 3.8 volts at 250 feet and continuously goes down to 0V at 5000 feet.

In operation, when a target is seen, the SR and LR channels output range accordingly but the SR return will only register if the LR return indicates it is within 250' (3.8 V or greater).

Otherwise, the LR channel indicates the target is not to be considered.

The first LR ambiguous return occurs between 9,750 feet and 10,250 feet and this is too small to register.

The car's speed Vg is not used in the bag sum voltage Vbs.

The voltage generated by Vba starts at ~ero and rises to approximately .2V at 35 mph (point 6) and then the Vba curves step up (now armed) to 92 12~379i approximately .95V (point 7) and will continue to rise as speed increases. When the distance to impact is a about 10 feet (that is when Vbr increases to 3.70V) the air bag will deploy as Vbs reaches the trip level set at 4.65V. Vbs = Vr + Vba = 4.65V. Note that Vr + Vba would never reach the bag trip level if the Vba curve did not step up .75V when it became armed at 35 mph.

The audio warning and braking algorithm is derived for a car going straight ahead but when the car turns, the safety ~one is too long and must be shortened appropriately. If a car turns sharply, a 20 foot zone would be ample and in moderate turns and at higher speeds a 40 feet or 50 feet zone would be adequate. A car makes sharp turns at lower speeds and gradual turns at higher speeds. For this reason, the driving monitor (DM) normally negative voltage input was added to the algorithm graph.

The effect of this negative voltage is to shorten or otherwise adjust the safe zone in turn at various speeds and conditions. The radar antenna also physically turns 25 in both directions to enable tl)e radar to see ahead in turns.

The air bag is set to deploy .2 sec be~ore impact at all approaching speeds between 35 to 204 mph. This allows time for the bag to fully inflate before impact. The total time it takes the radar system of the invention to activate the air bag is .01 seconds (1 foot @ 68 mph) from the time the target first appears.

The theory of operation of the radar system of the invention is explained in the following examples utilizing the graph of Fig. 11.

Example 1:

93 lZ~3'791 Let Vs = 4v (border line where danger starts and the saety margin is becoming too short) and Va = .85v (30 mph) and Vg = 1.5 v (56 mph) and solve for Vr (i.e., determine how much distance you should maintain in this situation to keep a safe margin).

Formula is Vs = Vr + Va ~ Vg - Vdm let Vdm = 0 now 4v = Vr + .85 + 1.5 - 0 no turns and Vr = 4 - .85 - l.S = 4 - 2.35 so Vr = 1.65v or 132 feet The solution implies that when the vehicle is approaching an object at 30 mph and the vehicle is going 56 mph, the vehicle should be 132 feet away to have an adequate safety margin. This is a highway situation where the vehicle is traveling straight ahead at 56 mph, the car in front is going only 26 mph so the vehicle is approaching it at 30 mph and the 132 feet distance is the vehicle safety margin.

Example 2:

Let Vs = 4v and Va = .lv (3.6 mph) and Vg - .lv l3.6 mph) and solve for Vr. This situation will occur when a vehicle is moving toward a building at 3.6 mph. The problem is to stop just before the vehicle impacts the building. How far away is the vehicle when the radar system applies braking?

Vs = 4v Va = .lv Vq = .lv and Vr is the safe distance Vs ~ Vr + Va ~ Vq - Vdm Vdm = 0 aqain Vs = Vr + Va + Vg + 0 Vr = Vs - Va - Vq = 4 - .1 - .1 = 3.8 or 3.8v so when Vr = 3.8v and the vehicle is about 11 feet from the building, the radar system of the invention warns the vehicle operator. This warning should provlde sufficient time to allow the vehicle to come to a full stop when going 3.6 mph.

94 'f~ Example 3:

Let the vehicle speed and closing rate be 60 mph which means Va = 1.75v and Vg = 1.6 as read from the algorithm graph. Again Vs = 4v because that's where the danger is assumed to start.

Vs = Vr + Va + Vg - Vdm Vs - 4 Vr = unknown Va = 1.75 Vg - 1.6 Vdm = 0 now that is Vs = Vr + Va + Vg or Vr = Vs - Va - Vg and Vr = 4 - 1.75 - 1.6 - .65.

So when Vr = .65v, the audio alarm will sound at 185 feet.

This means that the vehicle operator will have 185 feet in which to stop the vehicle while traveling at 60 mph toward the building. This may not be all the stopping distance required but would be sufficient time to slow the vehicle down to about 15 mph which would be a 16 times improvement. ~he vehicle operator is now alerted and is in control of the vehicle for stopping or varying the path of travel.

Example 4:

Let a vehlcle approach another vehicle on the highway and then follow it while traveling at 55 mph.

Vg ~ 55 mph or (1.45v) Va = 5 mph or t.l5v) which indicates that the followed vehicle is going a little slower or 50 mph.

since V~ - Vr + Va + Vg - Vdm (let Vdm = 0) then Vr - Vs - Va - Vg = 4 - .15 - 1.45 - 2.4v therefore 2.4v equals 88 feet to the vehicle being approached when the closing vehicle is going 55 mph.

Closer than 88 feet, the first audio tone would sound at about 82 feet, the second tone at about 75 feet, 37'~1 the third tone and one-third braking at around 68 feet.

However the braking would maintain the distance between vehicles at about 71 feet and if tl-e operator heeded the first tone he would have stayed back 88 feet or more.

Rxample 5:

Now examine a situation that suddenly happens when a vehicle is traveling at 45 mph and a second vehicle suddenly pulls out in front of the first vehicle from a cross street and is only 70 feet ahead of the first vehicle.

Vs = Vr + Va + Vg - Vdm let Vdm = O and let Vs = 4 be the margin desirable Vg ~ 45 mph = 1.2v Va = 45 mph = 1~3v and Vr = 70 feet = 2.75 now Vs - 1.2 + 1.3 + 2.75 + O = 5.25 since 5.25 is 1.25 more than 4.0, the eirst vehicle needs about 68 feet more than the 70 feet it already has to have ample stopping margin.

The radar sees and weights electronically the degree of danger and it's designed to react accordingly as designed.

In Example 5, the first vehicle probably can't fully stop but its speed can be reduced substantially. The operator may be able to steer around the second vehicle, especially when the radar gives an appropriate audio warnlng, applle~ braking.

In the above situation the radar warning system is initially de3igned to warn the operator in less than 1 second or at 65 feet from impact and then start one-third 96 1~37'~1 braking to slow the first vehicle down. If the speed is not reduced to less than 35 mph, the air bag would start to deploy at 10 feet before impact. In this situation the vehicle operator could probably reduce the vehicle speed to less than 35 mph with only 1/3 radar braking and perhaps to around 20 mph with operator brake appllcation.

The advantage of partial radar bra~ing is that it's automatic and initially quicker than operator braking and that partial braking still leaves the operator in braking control. When the radar activate.s the brake and the operator brakes too, the system lets the operator do 100% of the braking as provided by the Driver Monitor Input.

The Air Bag Algorithm The air bag (AB) portion of the alqorithm works the same as, and is similar to, the main warning and braking algorithm except the circuits are faster and the algorithm is weighted differently. The AB circuits output is ten time~ faster and the closlnq rate curve ~Vba points 2 to 6 to 7 to 8) is weighted twice the Va curve. The Vba curve doesn't arm until the approaching speed is 35 mph or greater. When 35 mph is reached the Vba curve steps up from point 6 to point 7 (now armed) and continues to rise up to point 8 if approaching speeds increase. The AB circuit deployment is set (adjusted) for .2 ~econds before collision at all closing rates between 35 and 204 mph.

When working AB problems, curves Vba and Vr indicate Vbs.

The trip level for the AB will be 4.65 volts before it will activate.

Example 6:

Two vehicles are going toward each other at a closing rate of 110 mph. Car A is going 60 mph and Car B 97 1~'''37~31 is going 50 mph, both on the same path of travel and only 100 feet apart.

When Vbs = 4.65v the air bag will deploy and ,Vba = llO mph = 1.25v so what value of Vr will deploy the air bag Vbs = Vba + Vr or vr = Vbs - Vba = 4.65 - 1.25 = 3.4v When Vr = 3.4 or about 32 feet away the air bag will activate If either car veered out of the pathway before 32 feet the air bag would not deploy. Assume that the vehicle that veered away travels toward a parked vehicle still going 50 mph then Vba - 1.0 volts.

Vbs = Vba + Vr or Vr = Vba - Vba = 4.65 - 1.0 = 3.65v or 15' So the air ~ g deploys 15' or .2 seconds before impact with the parked vehicle The Driving Monitor The driving monitor (DM) circuit monitors the vehicle's operation as it is driven and feeds this information back into the algorithm to modify the safety zone.

If the vehicle operator brakes or accelerates the car, makes slow, fast, gradual or sharp turns at various speeds, then these actions change the radar primary algorithm output sum voltage thereby changing the safety zone required from that already established eor straight driving. The DM voltage curve normally represents a negative voltage that is added to the positive voltage sum V8.

The DM curve i5 somewhat complex due to the algebraic sum of the nine input factors and how they are weighted by the primary components oE Vdm due to the degree of turn the vehicle operator makes at various speeds. When the vehicle is going slow turns may be very sharp and turns are usually mild at high speed.

98 1?~33~ As the vehicle goes slow and turns sharp a normal straight 30 feet zone would be reduced to about 15 feet in a turn. The safety zone is never brought back to zero but as the degree of turn increases the zone is brought back leaving enough zone immediately ahead to protect. In turns, less distance is needed straight ahead. More margin is needed in the direction of travel or turns. To enable the radar to see better in the direction of the turn, the antenna is pivoted up to 25 degrees to look at a point ahead in the path of the turn. As vehicle speed is increased and a mild turn is made, the zone is brought in to about 60'. In a high speed turn the zone may be reduced to only 100' while turning.

Fig. 12 is a graph presentation of desirable range and rejection of ambiguous (unwanted) signals beyond that range. The 250' primary short range (SR) slope at 180 phase shift point is dependent on the frequency of deviation of the transmitter and can be established between 1000' and 20,000'~ The system employs two deviation frequencies, one for 250' and the other for 5000'. The LR channel inhibits the ambiguous return from the SR multiple returns (see the graph). The system uses only a range of from 0 to 250' and it is desirable to eliminate all other ambiguous distance signals further than 250'. The LR channel is used primarily to assure that a target is within 250' or that it is more distant. If the target is at a distance greater than 250', the LR channel is preventing the SR channel from seeing the target. Without the LR channel to inhibit the SR ambiguous or unwanted return signals target range could not be determined properly.

The above examples should help in understanding the radar concepts of the invention and how the various factors are interrelated to provide the safety margin needed.

99 3791 The above described embodiment of this invention is merely descriptive of the principles and is not to be considered limiting. The scope of this invention instead shall be determined from the scope of the following claims including their equivalent:

100