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The AN/SQS-56 is an active/passive submarine detection sonar with severely limited capabilities. It is a hull-mounted system designed for frigate/corvette-sized ships. The OLIVER HAZARD PERRY-class ships fitted with this sonar are expected to use it primarily to detect submarines with their towed a rray (AN/SQR-18 and AN/SQR-19).

The sonar provides active panoramic echo ranging and passive digital multi-beam steering (DIMUS) surveillance. Most of the system's signal processing...

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