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Feature location and display apparatus

  • US 5,530,680 A
  • Filed: 04/11/1994
  • Issued: 06/25/1996
  • Est. Priority Date: 10/11/1991
  • Status: Expired due to Term
First Claim
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1. Underwater direction detecting apparatus comprising:

  • first transducer means comprising a first pair of transducers spaced apart relatively closely along a line, said first transducer means being responsive to received sound energy to produce first signals indicative of the direction of travel of said sound energy unambiguously but with relatively low angular accuracy;

    second transducer means comprising a second pair of transducers spaced apart relatively widely along said line, said second transducer means being responsive to received sound energy to produce second signals indicative of said direction with relatively high angular accuracy but ambiguity;

    a processor for deriving from said first and said second signals further signals defining said direction substantially unambiguously with relatively high angular accuracy.

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