OVERVIEW: The Type 2070 is a towed torpedo decoy system derived from the U.S.-designed AN/SLQ-25A Nixie, used to protect surface ships by diverting incoming acoustic-homing torpedoes. It operates by trailing behind the ship and transmitting acoustic signals that mimic ship signatures.

DETAILS: The Type 2070 system is based on the AN/SLQ-25A Nixie electro-acoustic countermeasure, incorporating a towed decoy unit (TB-14A), fiber-optic tow cable, shipboard winch, and control console. It functions by generating acoustic noise signatures that attract passive torpedoes or confuse active seekers. Chilean Navy Type 23 frigates (formerly Royal Navy vessels) are confirmed to retain and operate the Type 2070 system following acquisition. No versions of the system are currently in service with the United Kingdom, which transitioned to the S2170 Sea Sentor system in the early 2000s.

FUNCTION: The system is deployed via stern winch, trailing the towed body astern of the ship. It emits programmable acoustic signals to replicate ship engine or propeller noise, drawing torpedoes away from the ship's hull.

NOTE:
IOC: 1987 (AN/SLQ-25A); 1990s (Type 2070 on Royal Navy Type 23)
Operators: Chile
Platforms: Type 23 frigates (Chilean Navy: Almirante Cochrane, Almirante Lynch, Almirante Condell)

SOURCE:
Military Periscope - AN/SLQ-25A Nixie: https://www.militaryperiscope.com/weapons/sensorselectronics/electronic-support-measureselectronic-warfare/nixie-slq-25a/overview/ ; Federation of American Scientists - SLQ-25A: https://man.fas.org/dod-101/sys/ship/weaps/an-slq-25.htm ; UK Parliament - Surface Ship Torpedo Defence replacement programs ; Chilean Navy Frigate Inventory - Jane’s Fighting Ships (2024)