G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 15/06 (2006.01) C08G 81/00 (2006.01) G01S 7/52 (2006.01)
Patent
CA 2022086
An active sonar system and method of processing sonar signals which provide for target detection in the presence of main lobe interference. The system comprises a transmitter which transmits a plurality of uniquely encoded sonar signals in a plurality of angular directions. A receiver detects echoed target return signals and plane wave interference signals having different signal strengths transmitted from sources located at unknown angular directions. The receiver comprises a first processor including a plurality of adaptive filters arranged as a Gram-Schmidt spatial predictive canceler. The canceler produces an output signal having a spatial response which has nulls located in the angular directions of the interference sources. The nulls are proportional to the respective signal strengths of the interference sources. A second processor processes the output signal from the Gram-Schmidt predictive canceler by means of a plurality of filters matched to the plurality of unique codes contained in the target return signals. The second processor provide a plurality of matched filter output signals which are indicative of the signal strength and angular location of the targets. The existence of a detected target is determined by each matched filter whose output signal is above a predetermined threshold, and the angular direction of each target corresponds to the direction that the corresponding encoded sonar signal was transmitted.
Hughes Aircraft Company
Raytheon Company
Sim & Mcburney
LandOfFree
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