Communications – electrical: acoustic wave systems and devices – Plural transmitters to receiver or transmitter to plural...
Patent
1978-01-26
1980-01-08
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Plural transmitters to receiver or transmitter to plural...
181401, 181402, 367120, H04B 1100
Patent
active
041830091
ABSTRACT:
A low frequency detection system including the use of the sloping characteristics of the underwater near shore, the tapered section of ocean above the near shore, and an acoustic array. The acoustic array comprises a plurality of detectors that extend into the earth and are near the shore and tapered media. Low frequency sound energy in the range of from about 1 to about 100 Hz is coupled into the earth at discrete positions along the interface between the ocean and the sloping underwater shore. The maximum energy density for each frequency occurs at different ocean depths and the acoustic detectors are positioned to receive the optimum earth radiated beam at selected frequencies. The system involves locating tuned elements of an array in different arrangements and using a plurality of arrays and moving or stationary sound sources for active target detection and underwater earth mapping.
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patent: 2838741 (1958-06-01), Mason
patent: 3803616 (1974-04-01), Kopf et al.
patent: 3811106 (1974-05-01), Tyrrel
patent: 3922635 (1975-11-01), Colvin et al.
patent: 4114135 (1978-09-01), Funk
Axelrod et al., J. of the Acoustical Society of America, vol. 37, No. 1, . 1965, pp. 77-83.
Carlson Paul F.
Mitchell Gordon L.
Curry Charles D. B.
Farley Richard A.
Sciascia R. S.
The United States of America as represented by the Secretary of
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