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A sonar decoy is a device for decoying sonar. One may be released from a submarine or a surface vessel. A decoy acts as false targets for human operators and/or sonar-homing weapons such as acoustic torpedoes .
The AN/SLQ-25 Nixie and its variants are towed torpedo decoys used on US and allied warships. It consists of a towed decoy device (TB-14A) and a shipboard signal generator. The Nixie is capable of defeating wake-homing, acoustic-homing, and wire-guided torpedoes. The decoy emits signals to draw a torpedo away from its intended target.
All versions of the SLQ-32, with the exception of the (V)4, are interfaced with the Mk 36 Decoy Launching System, able to launch chaff and infrared decoys under the control of the SLQ-32. A growing number of systems are being upgraded to incorporate the Australian-designed Mk 53 Nulka decoy launching system. [4] [8]
Decoys on USS Moosbrugger (DD-980). The AN/SLQ-49 Chaff Buoy Decoy System, commonly referred to as "Rubber Duck", consists of inflatable radar-reflecting decoy buoys.It is used by the U.S. Navy, Royal Navy, and other NATO countries.
The T-Mk 6 Fanfare is a towed sonar decoy developed after the Second World War by the United States Navy. It replaced the Foxer noisemaker. It was more effective than the Foxer, producing a sound similar to a ship's propeller, rather than wideband noise.
Sieglinde [ˌziːkˈlɪndə] was a sonar decoy used during the Second World War by German U-boats. Sieglinde was installed in chambers on the sides of the U-boat. [1] It could be ejected to a considerable distance from the boat when attempting to hide from a seeker's sonar equipment.
Against the ASW weapon itself, both active and passive countermeasures are used. The former may be a noise making jammer or a decoy providing a signal that looks like a submarine. Passive countermeasures may consist of coatings to minimize a torpedo's sonar reflections or an outer hull to provide a stand-off from its explosion.
The mobile submarine simulator (MOSS) MK70 is a sonar decoy used by submarines of the United States Navy.It was a 10-inch vehicle, without an explosive warhead, but able to generate both an active sonar echo and a passive sound signature recorded to be extremely similar to that of the launching submarine.