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Virtually steerable parametric acoustic array

  • US 4,703,462 A
  • Filed: 04/15/1985
  • Issued: 10/27/1987
  • Est. Priority Date: 04/15/1985
  • Status: Expired due to Fees
First Claim
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1. A sonar system of the type wherein a carrier signal is modulated by an envelope signal and the modulated carrier signal is returned from an echo source as a reflected signal, the improvement comprising:

  • means for converting the reflected signal to a digital reflected signal;

    a first digital integrator for digitally integrating the digital reflected signal and producing a digital integrated signal;

    a digital filter having a response matched to the envelope signal for digitally filtering the digital integrated signal thereby producing a digital filtered signal;

    means for autoregressive modelling the digital filtered signal as the impulse response of a filter having a complex s-plane pole thereby providing a digital complex pole location; and

    means for converting the digital complex pole location to a digital bearing signal proportional to the bearing of the echo source.

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