OVERVIEW: The SCAD-200 (Submarine Countermeasure Acoustic Device) is an externally launched expendable acoustic torpedo decoy developed for Royal Navy submarines. It is designed to mislead incoming homing torpedoes by emitting deceptive acoustic signatures.

DETAILS: Deployed from external submarine launchers and operates by transmitting programmable acoustic signals to mimic submarine signatures. It supports both passive and active acoustic decoy modes tailored to deceive advanced torpedoes. The system is designed for short-duration missions, with effective range measured in kilometers before battery expiration. It is confirmed to be in service aboard Royal Navy platforms and is supported under UK Ministry of Defence contracts issued to Ultra Electronics (Ocean Systems), the original equipment manufacturer.

FONCTION:
Deployed from external submarine launcher upon torpedo threat detection.
Transmits mission-programmed active and passive acoustic signals.
Presents a false underwater target to seduce and divert incoming torpedoes.

SOURCE:
UK MOD VEAT notice for SCAD ISS ; Wikipedia – Sonar decoy systems ; International Defense Security & Technology – “Modern Torpedo Defence Measures” ; Forecast International PDF (if available) ; https://bidstats.uk/tenders/2023/W09/793270041 ; https://www.forecastinternational.com/archive/disp_old_pdf.cfm?ARC_ID=825