Sonar system

Details Sonar system Sonar system

1981-12-03

1984-03-27

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

367101, G01S 1504

Patent

active

044398450

ABSTRACT:
A sonar system for positive identification of certain resonant body targets such as mines. Two acoustic signals of different frequencies are transmitted toward the target and the acoustic returns are separated into the component frequencies, detected, and thereafter subtracted from one another. A signal, above a threshold value, resulting from the subtraction is indicative of a resonant body target and the indication is displayed and/or recorded.

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patent: 4056802 (1977-11-01), Rabon
patent: 4216537 (1980-08-01), Deligniers

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