Interference suppression unit for a sonar apparatus

Details Interference suppression unit for a sonar apparatus Interference suppression unit for a sonar apparatus

G - Physics

01

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349/25

G01S 7/52 (2006.01) G01S 7/527 (2006.01) G01S 7/536 (2006.01) G01S 15/42 (2006.01) G10K 11/34 (2006.01)

Patent

CA 1203613

Abstract: Sonar apparatus provided with a beamforming network (1) containing several receiving channels (4A-M) for supplying, for each direction of beam incidence 9 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 thereto 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.

421472

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