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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 and a shipboard signal generator. The decoy emits signals to draw a torpedo away from its intended target.
The Nixie attempts to defeat a torpedo's passive sonar by emitting simulated ship noise, such as propeller and engine noise, which is more attractive than the ship to the torpedo's sensors.
The more modern AN/SLQ-25B includes equipment of the AN/SLQ-25A (refreshed variant of the AN/SLQ-25 to include fiber optic towed cable and COTS equipment) and incorporates a towed array sensor to detect submarines and incoming torpedoes. The AN/SLQ-25B also incorporates additional active sonar decoys by receiving, amplifying, and returning "pings" from the torpedo, presenting a larger false target to the torpedo.
Typically, larger ships may have two Nixie systems mounted on the rear of the ship to allow operation singularly or in pairs while smaller ships may have only one system.
Under a joint UK/ US Memorandum of Understanding, the UK MoD and the US DoD are furthering torpedo survivability systems. The US is currently working on an Active Source programme called the DCL Technology Demonstrator programme and the UK has developed and entered into service the S2170 Surface Ship Torpedo Defence system.
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