Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Patent
1971-03-10
1979-10-30
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
By combining or comparing signals
343112D, G01S 380
Patent
active
041730089
ABSTRACT:
A method and apparatus for passively detecting, locating and tracking submerged or waterborn objects which generate acoustic radiation as they move through the water, includes a hydrophone array which is linked to a monitoring station by cable or radio transmitters. The apparatus at the monitoring station includes a hydrophone selector for individually monitoring the output of each hydrophone, a band pass filter, a db meter and visual display apparatus. The db meter is provided with indicia to convert the difference in intensity in db for the hydrophones to a range or distance ratio from the hydrophones to the noise source. A fix on the noise source can be obtained by plotting range ratio circles or using a tactical display scope. Once the noise source is located, the db meter is calibrated to read directly the range from the hydrophones to the object.
REFERENCES:
patent: 2206036 (1940-07-01), Herson
patent: 3430243 (1969-02-01), Evans
Piggott, J. Acous. Soc. Amer., vol. 36, No. 11, Nov. 1964, pp. 2152 & 2153.
Keith Stanley R.
Robinson Ben J.
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