Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Patent
1969-01-08
1999-06-01
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
By combining or comparing signals
G01S 380, G01S 1500
Patent
active
059094095
ABSTRACT:
An underwater combination of a passive and an active acoustic mechanism is sed to detect and locate a surfaced or submerged object or target. The passive mechanism utilizes a pair of separated hydrophones to detect an object. The hydrophones are then followed by bandpass filters according to the frequency of interest and the outputs thereof correlated to locate the object. A positive correlation output indication initiates the active acoustic mechanism which then verifies the detection of an object by transmitting a pulse sonar. The output of a transducer responsive to the reflected pulse sonar is then analyzed to indicate whether the detected object is surfaced or submerged and whether the detected object is approaching, departing or stationary.
REFERENCES:
patent: 3017832 (1962-01-01), MacDonald
patent: 3115833 (1963-12-01), Hall et al.
patent: 3121856 (1964-02-01), Finney
patent: 3308760 (1967-03-01), Peters
patent: 3346862 (1967-10-01), Raudsep
Trefethen et al, Electronics vol. 30, No. 4, Apr. 1957, pp. 156-160 340/3.
Carroll, Electronics, vol. 37, No. 18, Jun. 1964, pp. 99-104 340/3.
Barber Lewie M.
Criswell Bernie R.
Findeisen Allen G.
Weiss Benjamin F. L.
Pihulic Daniel T.
The United States of America as represented by the Secretary of
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