The AN/SQS-35 was a United States Navy surface ship independent, towed variable depth sonar system (IVDS) developed by the Naval Underwater Sound Laboratory the EDO Corporation. [1] [2]
The AN/SQS-35 could function under 3 primary modes, with 'search' and 'attack' (active) and 'listen' (passive) modes available to it. The sonar system utilized 3 target displays, two PPIs and a classification recorder, and provided ships mounted with the towed array with the capability to search the 13 kHz high-frequency band at variable depths, including below the layer or depths of up to 180 meters. The sonar could maintain a maximum power output of 30 kW and a range of 12,000 yards (11 km). [1]
The AN/SQS-35 and its variants were mounted in the U.S. Navy's Knox Class Frigates, the U.S. Hamilton-class coast guard cutters, as well as the JMSDF's Shirane class and Tikatasuki class destroyers. [3] [1] [2]