Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1980-09-10
1982-05-18
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
343 16R, 367 8, 367 88, G01S 1506
Patent
active
043308767
ABSTRACT:
A sonar bearing determining system comprises a generator for radiating a sonar signal and a receiver for receiving echo signals. The receiver comprises an array of spaced receiving transducers and a modulating and sampling arrangement which consists of a multiplexer driven by a clock signal for producing a combined signal. The combined signal is of the form of a repetitive sequential sample of each of the received signals modulated by a signal equal to the multiplexing signal but phase displaced relative thereto. A bearing determining device is arranged to determine the bearing of an object providing an echo in dependence upon the frequency component of the combined signal or in dependence upon the time displacement of the combined signal relative to a predetermined time value. The modulating and sampling means is arranged to route selectively samples of each of the received signals and thereby to effect both modulating and sampling functions.
REFERENCES:
patent: 3593254 (1971-07-01), Glenn, Jr. et al.
patent: 3887923 (1975-06-01), Hendrix
patent: 4034376 (1977-07-01), Barton
Farley Richard A.
Plessey Overseas Limited
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