Accession Number : ADD017363

Title :   Anti-Torpedo Stern Defense System.

Descriptive Note : Patent, Filed 6 Aug 81, patented 20 Dec 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Groves, Kenneth W

Report Date : 20 Dec 1994

Pagination or Media Count : 8

Abstract : A stern torpedo defense system uses a pair of passive sonar towed tactical detectors in tandem alignment to detect the presence and trajectory of a stern torpedo attack. The detectors are towed below thewake of a surface ship and include arcuate arrays of transducer elements mounted in low self-noise, roll pitch and yaw stabilized platforms. The region aft of the stern of the ship is examined by an ovelapping plurality of preformed passive sonar beams of preselected beamwidth. Signal processing means monitor the power level of the beams and detect the prescence and trajectory of an attacking torpedo so that suitable ordinance may timely and effectively be deployed to destroy the torpedo and thereby thwart the attack.

Descriptors :   *PATENTS, *SHIP STERNS, *ANTITORPEDO TORPEDOES, SIGNAL PROCESSING, POWER LEVELS, ROLL, SHIPS, TORPEDOES, YAW, DETECTORS, DEFENSE SYSTEMS, OCEAN SURFACE, ALIGNMENT, WAKE, LOW LEVEL, TRANSDUCERS, TRAJECTORIES, TORPEDO ATTACK, SELF NOISE, STABILIZED PLATFORMS

Subject Categories : Torpedoes

Distribution Statement : APPROVED FOR PUBLIC RELEASE