G - Physics
01
S
349/25
G01S 3/80 (2006.01) G01S 3/802 (2006.01) G10K 11/00 (2006.01) G10K 11/34 (2006.01)
Patent
CA 1263734
13 ABSTRACT OF THE DISCLOSURE A passive sonar system which forms multiple receiver beams for detection of possible targets. The transducer array for the system includes a plurality of pairs of transducers, the transducers of each pair lying along a generally radial line emanating from a central point. The output signal from the outer transducer of each pair is delayed by 90° or .lambda./4C relative to the inner trans- ducer, and the delayed signal is combined with the output signal from the other transducer of the pair in a summing amplifier so that only one signal per transducer pair need be sampled by a multiplexer for transmission via a coaxial cable to beamformer apparatus. The concept is applicable to groups of transducers with more than just a pair, i.e., with three or more transducers. Appropriate additional delays are provided with all of the output signals and delayed output signals of a group being received by a single summing amplifier.
527800
Jones Charles Howard
Kesner John William
Oldham And Company
Westinghouse Electric Corporation
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