$20.5M for 3 More NIXIE Torpedo Decoy SystemsJun 30, 2005 07:01 UTC by Defense Industry Daily staff
ST Production Systems, Inc. in Smithfield, PA received a $20.5 firm-fixed-price modification to exercise an option under previously awarded contract N00024-98-C-6111 for supplies, services, and production of the AN/SLQ-25A NIXIE torpedo countermeasure system. This modification will provide for production, test and delivery of an additional 3 AN/SLQ-25A torpedo counter-measure transmitting sets and upgrade kits.
Modern torpedoes still use acoustic homing, bearing in on the noise created by their target ship’s propellers and machinery. Nixie is trailed underwater by coaxial signal/tow cables. An operator aboard the ship controls the device via that coaxial cable. The streamlined main body (‘fish’) houses the acoustic projector. The Nixie acts as a decoy by generating a more attractive acoustic signal, producing more noise than its tow vessel in order to defeat a torpedo’s passive acoustic homing. But, active acoustic homing is also used by many torpedoes. To deceive the active acoustic sensors, Nixie must intercept their ‘pings’, amplify them, and then return these signals to the homing torpedo in a way that confuses it.
The AN/SLQ-25A includes improved deceptive countermeasures capabilities. The AN/SLQ-25B includes improved deceptive countermeasures capabilities, a fiber optic display LAN, a torpedo alertment capability and a towed array sensor.
Work will be performed in Smithfield, Pa., and is expected to be completed by March 2007. Contract funds will not expire at the end of the current fiscal year. The Naval Sea Systems Command, Washington, D.C. issued the contract. (N00024-98-C-6111).
- GlobalSecurity.org – AN/SLQ-25 NIXIE
- CASR DND101 – Canadian Forces Ship’s Countermeasures – the AN/SLQ-25 Nixie