Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1966-09-26
1981-06-23
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367901, G01S 1532
Patent
active
042754607
ABSTRACT:
A propeller modulation enhancement and display system which suppresses hull cho and displays propeller modulation of a return sonar signal in real time. The real-time operation is obtained through the use of a multichannel frequency spectrum analyzer having a plurality of narrow bandpass filters covering the frequency of interest. Suppression of the hull echo is obtained through the use of a narrow band-reject filter having a variable center frequency. The filter precedes the multichannel frequency spectrum analyzer.
REFERENCES:
patent: 2724817 (1955-11-01), Hisserich
patent: 3140461 (1964-07-01), McKinney
Branning A. L.
Farley Richard A.
Sciascia R. S.
The United States of America as represented by the Secretary of
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