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HELRAS or the Helicopter Long Range Active Sonar is a naval helicopter undersea sensor, a dipping sonar (a form of towed array sonar), deployed by helicopters of many naval air forces around the world to detect submarines; it is a form of geophysical MASINT.
AN/AQS-13 dipping sonar deployed from an SH-3 Sea King. The AN/AQS-13 series was a helicopter dipping sonar system for the United States Navy.These systems were deployed as the primary inner zone anti-submarine warfare (ASW) sensor on aircraft carrier based helicopters for over five decades. [1]
The sonar systems businesses of Thomson and GEC-Marconi then merged to become Thomson Marconi Sonar (TMS). In 1999, as part of the merger of Marconi Electronic Systems (as GEC-Marconi had become), and British Aerospace , the newly formed BAE Systems held 49.9% of TMS, which it sold to Thales (the new name for Thomson-CSF) in 2001.
Powered by RTM322 engines and fitted with Blue Kestrel radar, Thomson Marconi FLASH dipping sonar and Orange Reaper ESM. 44 built. [167] Model 112 Italian Navy early warning variant with same airframe as Model 110 but with Eliradar HEW-784 radar in large underfuselage radome. Four built. [168] Series 200
AN/AQS-13 dipping sonar deployed from an H-3 Sea King. Helicopters can be used for antisubmarine warfare by deploying fields of active-passive sonobuoys or can operate dipping sonar, such as the AQS-13. Fixed wing aircraft can also deploy sonobuoys and have greater endurance and capacity to deploy them.
Configured with pulse-compression radar, low frequency dipping sonar, radar warning receiver and doppler navigation system, it is also armed with torpedoes for use aboard Pakistan Navy's Zulfiquar-class frigates. [6] Z-9G Export version of the WZ-9 gunship. [7] Z-9EH Transport, emergency and/or passenger variant. [8] Z-9W Also known as WZ-9.
The Ka-27PL anti-submarine version is equipped with a radar, and either a dipping sonar or a magnetic anomaly detector. It can also carry either up to 36 sonobuoys, or a torpedo, or between six and eight conventional depth charges, or a single nuclear one. Ka-27PLs generally operate in pairs as hunter-killer teams. [1]
The Mi-14PL anti-submarine version is equipped with a radar, a dipping sonar and a magnetic anomaly detector. [ 1 ] The first prototype V-14, converted from a Mi-8 and powered by the older and less powerful Klimov TV2-117 engines, flew on 1 August 1967. [ 3 ]