Sonar system for detection of near bottom targets

Details Sonar system for detection of near bottom targets Sonar system for detection of near bottom targets

1985-07-15

1995-05-09

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Echo systems

Side scanning or contour mapping sonar systems

367 87, 367 93, 367131, G01S 966, G01S 1589

Patent

active

054146755

ABSTRACT:
Target detection apparatus wherein a pulse of acoustic energy transmitted toward a target area of the sea bottom is reflected back to two spaced-apart receiver transducers. The sum and difference of the transducer outputs are obtained with the phase relationship therebetween being detected. An acoustic return from a target above or on the bottom will cause two returns to arrive at the receiver transducers at very slightly different times and at different angles thereby resulting in a phase relationship different than a return from the bottom. An output signal indicative of a target or no target condition is provided and is normalized so that its amplitude is independent of target strength.

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patent: 4313184 (1982-01-01), Jarman et al.
patent: 4319348 (1982-03-01), Suzuki

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