Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1989-06-15
1991-03-19
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367903, 73626, G01S 1500
Patent
active
050016784
ABSTRACT:
A detection system forms a plurality of reception beams successively in angular directions by receiving incoming signals from various directions in a manner that the Doppler effect is produced to vary the carrier frequency of the incoming signals. The detection system displays underwater conditions on an indicator. To determine the underwater conditions, the detection system uses a plurality of ultrasonic transducers for receiving incoming signals, a plurality of preamplifiers for amplifying the reception signals produced by the ultrasonic transducers. A first coupling device which connects at least two of the ultrasonic transducers to a single preamplifier, and a matched filter for pulse-compressing reception signals produced by the ultrasonic transducers. A second coupling device successively couples the output terminals of the preamplifiers to an input terminal of the matched filter. The indicator displays output signals from the matched filter. The use of the first coupling device reduces the number of the preamplifiers.
REFERENCES:
patent: 4127034 (1978-11-01), Lederman et al.
patent: 4403314 (1983-09-01), Tournois
patent: 4817066 (1989-03-01), Takasugi et al.
Fukuoka Itsuo
Nagano Hiroshi
Furuno Electric Company Ltd.
Pihulic Dan
Tarcza Thomas H.
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