Nova Patents
USRE35535E

Broadband acoustic doppler current profiler

Claim Score by NHIP

Read claim 1, the broadest

Abstract

A system and method for measuring current velocities using coded-pulse broadband acoustic signals. Autocorrelation of two phase coded pulses which are in the water during a single transmission cycle is used to calculate a Doppler frequency. The effective result is current profilers having improved profiling range and spatio-temporal resolution.

Term

Term ended

Expired 4 May 2015, 11.4 years ago.

  1. Priority
  2. Filed
  3. Granted
  4. Expired
  5. Today

11 claims: 1 independent, 10 dependent

  1. 1.
    1. A velocity measuring system, comprising:PA1 a transmitting transducer for producing a beam pointing in a direction along which a phase change is measured;PA1 pulse transmission means for providing a pulse train to the transmitting transducer, the pulse train comprising at least first and second emitted pulses having a predetermined pulse separation;PA1 mean for complex sampling in echo return of the emitted pulses received by a receiving transducer so as to provide a first set of complex samples;PA1 means for displaying the first set of complex samples by a selected time lag thereby producing a second set of complex samples;PA1 means for computing a measured value of complex correlation using at least a portion of the first set of complex samples and at least a portion of the second set of samples;and PA1 means for obtaining a velocity measurement based on a Doppler frequency calculated from the complex correlation.