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Direction determination in sonar systems

  • US 4,030,062 A
  • Filed: 12/10/1975
  • Issued: 06/14/1977
  • Est. Priority Date: 12/14/1974
  • Status: Expired due to Term
First Claim
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1. In a method for determining the direction of echo signal pulses in a medium by means of a close range sonar system having at least one linear array of electroacoustic transducers and presenting a wide aperture angle and high azimuth and radial resolution,the improvement comprising:

  • dividing the total aperture angle into a plurality of partial regions each having a respective median direction and an aperture angle ##EQU31## where c is the speed of sound in the medium, D is the length of the transducer array, and B is the bandwidth of the emitted signal pulses;

    subjecting the received signals associated with each partial region to a delay time compensation corresponding to its associated median direction;

    scanning the signals received by successive units of the transducers of said array at a selected frequency fs'"'"' ;

    intermediately storing the scanned signals;

    sampling successive ones of the intermediately stored signals at a sampling frequency fs to form a serial signal; and

    phase compensating the resulting serial signal to produce a direction indication.

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