System and method for distance measurement by inphase and quadrature signals in a radio system

(57) It is the system and method of range finding using a summary wireless system. A train of impulses moves to the 2nd radio transceiver from the 1st radio transceiver, and range finding is performed by deciding on the time concerning subsequently returning from the 2nd radio transceiver to the 1st radio transceiver. Actual range finding is two process processes. In the 1st process, distance is measured by low resolution and distance is measured by high resolution in the 2nd process. The 1st train of impulses is transmitted using the transmitting time base from the 1st radio transceiver. The 2nd radio transceiver receives the 1st train of impulses. The 2nd radio transceiver returns transmission for the 2nd train of impulses to the 1st radio transceiver, after synchronizing the time base and the 1st train of impulses of itself. The 1st radio transceiver ranks second and synchronizes a receiving time standard and the 2nd train of impulses. Subsequently, the time delay between transmitting time base and a receiving time standard may be determined. This time delay shows the sum total flight time of the 1st train of impulses and the 2nd train of impulses. Time delay includes a low accuracy distance attribute and a high precision distance attribute. The low accuracy distance between the 1st radio transceiver and the 2nd radio transceiver is determined. Low accuracy distance expresses the distance between the 1st radio transceiver in low resolution, and the 2nd radio transceiver. From this time delay, an inphase (I) signal and a quadrature-phase (Q) signal are generated, and, thereby, a high precision distance attribute is determined. This high precision distance expresses the distance between the 1st radio transceiver in high resolution, and the 2nd radio transceiver. Subsequently, the distance between the 1st radio transceiver and the 2nd radio transceiver is determined from these low accuracy distance attributes and a high precision distance attribute.