Method for elimination of passive noise interference in sonar

  • US 6,108,269 A
  • Filed: 10/01/1998
  • Issued: 08/22/2000
  • Est. Priority Date: 10/01/1998
  • Status: Expired due to Term
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First Claim
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1. A sonar depth sounder device comprising:

  • a display;

    a transmitter for generating a plurality of sonar signals toward the bottom surface of a body of water, wherein said transmitter transmits at least one sonar signal towards a bottom surface of said body of water;

    a receiver, wherein said receiver receives a reflected sonar signal corresponding to said transmitted signal; and

    a processor, connected to said transmitter and said receiver, wherein said receives sonar signals indicative of ambient noise in said body of water and sends a signal representative of said ambient noise to said processor;

    wherein said processor determines a detection threshold value based upon said signal representative of said ambient noise;

    wherein said processor causes said display to display data corresponding to said reflected sonar signal when said reflected sonar signal has an amplitude greater than said detection threshold; and

    wherein said processor calculates said detection threshold value (DT) according to the following equation;

    
    
    space="preserve" listing-type="equation">DT=mean.sub.ambient +α

    variance.sub.ambient where meanambient is the mean of said sonar signal indicative of ambient noise, and where varianceambient is the variance of said sonar signal indicative of ambient noise, and where α

    is a scaling factor.

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