OVERVIEW: The Chinese towed acoustic decoy is a naval self-protection device designed to lure away incoming acoustic-homing torpedoes. It is a passive or active countermeasure deployed from surface combatants to enhance underwater survivability.

DETAILS: This system has been in service with the People's Liberation Army Navy (PLAN) since at least 2012 and is used aboard several modern Chinese surface warships. The decoy is deployed from the stern or torpedo defense module and towed behind the vessel at operational depths. It emits or reflects acoustic signatures to confuse torpedo seekers or draw them away from the host ship.

The device is used on ships equipped with integrated torpedo defense systems, though exact model numbers and technical configurations are not publicly disclosed. It forms part of China's layered underwater defense suite alongside sonar and hard-kill systems.

FUNCTION: The towed acoustic decoy works by mimicking the acoustic signature of the host vessel or generating deceptive noise to mislead active or passive homing torpedoes. Once deployed, it serves as a distant target for the incoming weapon, drawing it away from the ship.

NOTE:
IOC: 2012+ (PLAN surface fleet use observed)
Operators: China
Platforms: Type 052C destroyer, Type 052D destroyer, Type 055 destroyer, Type 054A frigate

SOURCE:
U.S. Office of Naval Intelligence: https://www.oni.navy.mil/Portals/12/Intel%20agencies/China_Military_Power_Report_2015.pdf ; U.S. Department of Defense China Military Reports: https://media.defense.gov/2023/Oct/19/2003329692/-1/-1/1/2023-MILITARY-AND-SECURITY-DEVELOPMENTS-INVOLVING-THE-PEOPLE'S-REPUBLIC-OF-CHINA.PDF ; Naval War College Review ; Jane’s Underwater Warfare Systems ; Forecast International Naval Weapons Database