Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent
1983-02-22
1985-10-22
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
367103, G01S 766, G01S 1506
Patent
active
045492867
ABSTRACT:
Sonar apparatus provided with a beamforming network (1) containing several receiving channels (4A-M) for supplying, for each direction of beam incidence, digital composite signal products obtained by superposition of the receiving channel output signals and for transforming the signal products to a low-frequency band. The signal products are fed to a signal analysing circuit (3) comprising blocking circuits (62 and 63), and to a noise detector (61) for deriving, for each direction of beam incidence, a blocking circuit control voltage from the interference signal components in the signal products. The noise detector selects signals outside the low-frequency band part representing the transmitting/receiving band, and determines the modulus of the filtered signals and the average value thereof. The modulus and, after thresholding, the average value are fed to a comparator (77) to generate the control voltage.
REFERENCES:
patent: 2978577 (1961-04-01), Ketchledge
patent: 3609672 (1971-09-01), Bossert
Langeraar Huibert B.
Van Der Schoot Alexander P. M.
Farley Richard A.
Franzblau Bernard
Hollandse Signaalapparaten B.V.
Mayer Robert T.
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