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ACTIVE SUBMARINE TARGET ECHO SYNTHESIZER

  • US 3,609,671 A
  • Filed: 03/23/1970
  • Issued: 09/28/1971
  • Est. Priority Date: 03/23/1970
  • Status: Expired due to Term
First Claim
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1. An active submarine target echo synthesizer comprising:

  • a. a receiver and aspect encoder circuit including an array of spaced receiver transducers, amplifying means and an aspect encoder for receiving active input sonar signals and providing a digital output signal representative of the aspect angle of said target from the source of said active sonar signal;

    b. memory means including a core memory and a digital to analog converter means;

    c. said core memory having a matrix of cells, each of specific output signal characteristics for a range of types of submarine targets and for specific aspect angle of the target;

    d. said core memory including manual means for preprogramming said core memory for a specific type of submarine and being connected to said aspect encoder for addressing said core memory for a specific aspect angle derived from said active sonar input signal;

    e. sequential pulse time gating means for said core memory for sequential activation of the cell addressed portions of said core memory to provide digital output signals from said cells to said digital to analog converter means;

    f. a carrier wave generator means connected to said receiving circuit amplifier means to provide a carrier wave of frequency corresponding to the frequency of said incoming active sonar signal;

    g. an amplitude modulator connected to said carrier wave generator and to the analog output of said digital to analog converter to modulate said carrier wave in accordance with the aspect angle of said target;

    h. range translation and modulator means connected to said amplitude modulator and to said receiver circuit to further modulate said carrier wave in accordance with the range of said target, derived from said active sonar signal input; and

    i. a reflective wave transducer means connected to said range modulator to provide a return sonar signal representative of the type of submarine target, its aspect angle and range.

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