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The AN/BQQ-9 is a thin-line, towed array sonar and signal processing system for early OHIO-class submarines.

It provides increased detection ranges and enhanced tracking and classification capabilities over hull-mounted sonars. The system processes signals received from the AN/BQR-15 (SPALT 9080) passive towed array. BQQ-9 uses the UYK-20 and UYS-1 signal processors.

Five later OHIO-class submarines were fitted with the Rockwell towed array broadband interim display unit...

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