Sonar system
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United States of America Patent
Stats
-
Mar 27, 1984
Grant Date -
N/A
app pub date -
Dec 3, 1981
filing date -
Dec 3, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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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