AN/SQQ-23 PAIR

The AN/SQQ-23 performance and integration retrofit (PAIR) was an active/passive detection sonar. It was an upgrade of the AN/SQS-23 sonar, with improved passive-active detection and localization (PADLOC). The SQQ-23 configuration used two sonar domes instead of one; the second dome housed the passive transducer. One benefit was the acquisition of a track-while-scan capability through the use of the two sonar domes. PAIR also offered improved passive detection.

Three solid-state...