SSTD

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Surface Ship Torpedo Defence

title: "SSTD" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["close-in-weapon-systems", "equipment-of-the-royal-navy", "naval-warfare", "weapons-countermeasures"] description: "Surface Ship Torpedo Defence" topic_path: "history/military" source: "https://en.wikipedia.org/wiki/SSTD" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Surface Ship Torpedo Defence ::

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The United Kingdom Surface Ship Torpedo Defence (SSTD) system entered into service with the Royal Navy in 2004. The system is produced by Ultra Electronics and is known as S2170 or Sonar 2170 by the Royal Navy and as Sea Sentor in the export market.

The system consists of

an acoustic passive towed array
a towed acoustic countermeasure (flexible)
a single-drum winch
a processing cabinet
2 display consoles
2 expendable acoustic device launchers (1 port, 1 starboard)
16 expendable acoustic devices (8 in each launcher)

The system is a footprint compatible

The passive acoustic towed array is specifically designed to detect torpedoes (unlike traditional ASW sonars) and has additional in-built non-acoustic as well as acoustic intercept sensors. Through advanced AI processing it is able to generically identify torpedoes as well as classify specific weapon types and modes and undertake threat evaluation and posturing analysis. The system provides tactical advice dependent upon the specific threat weapon, mode and posture to maximise vessel survivability, which typically involves vessel manoeuvres and also includes the deployment of countermeasures. The countermeasures - both towed and expendable variants - lure the threat away from the vessel in a soft-kill manner.

Ultra Electronics also produces a hard-kill variant known as the TRAPR DCL system currently under development for the US Navy.

References

[http://www.ultra-sonar.com/resources/Surface%20Ship%20Torpedo%20Defence%20(3).pdf SSTD Datasheet at the Ultra Electronics website] {{webarchive. link. (2012-03-26)
[https://ukdefencejournal.org.uk/contract-placed-for-type-31-frigate-torpedo-defence-system/ Sonar 1270]
replacement for the [[AN/SLQ-25 Nixie]] system previously installed on [[Royal Navy. RN]] warships.[http://www.mod.uk/DefenceInternet/FactSheets/EquipmentFactsheets/Sonar2170SurfaceShipTorpedoDefencesstd.htm UK MOD project status] {{webarchive. link. (February 14, 2007)

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::