Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With beam steering – scanning – or focussing
Patent
1963-10-31
1980-06-10
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With beam steering, scanning, or focussing
367123, 367138, 367153, 367173, G01S 380
Patent
active
042076218
ABSTRACT:
1. An underwater acoustic listening equipment for use in selectively estashing one of a number of narrow angle listening beams having good signal to noise ratio comprising:
a spherical framework,
several hundred identical hydrophones fixedly secured to the framework in approximately uniformly distributed relationship and identically oriented with respect to and equidistant from the center of the framework,
acoustic and vibration shielding between said hydrophones and said framework to substantially block acoustic energy from reaching each hydrophone from a reverse direction,
means for summing signals from a plurality of the hydrophones,
a delay line for each hydrophone,
beam selecting switch means for coupling the signals from a group of the hydrophones supported on a substantial area of the spherical framework symmetrical about the line of direction of the desired beam and delayed by the respective delay lines in accordance with the spacing in the direction of the beam of the hydrophones selected by the switch means and the speed of waterborne acoustic energy where the equipment is used.
REFERENCES:
patent: 1995708 (1935-03-01), Fischer
patent: 2786193 (1957-03-01), Rich
patent: 2915588 (1959-12-01), Bose
patent: 2925581 (1960-02-01), Hackley
patent: 3039079 (1962-06-01), Walters et al.
patent: 3074048 (1963-01-01), Turner
patent: 3163844 (1964-12-01), Martin
Clearwaters Walter L.
Einstein Lloyd T.
Farley Richard A.
Lall Prithvi C.
McGill Arthur A.
Sciascia Richard S.
The United States of America as represented by the Secretary of
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