Accession Number : ADD016195

Title :   Sonar Countermeasure.

Descriptive Note : Patent, Filed 28 Dec 62, patented 12 Oct 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Haisfield, Rudolph M

Report Date : 12 Oct 1993

Pagination or Media Count : 6

Abstract : A countermeasure for acoustic homing torpedoes where a plurality of sound transducers are transversely arrayed across the attack path of the torpedo. The transducers are energized in a time sequence to simulate a relative transducer movement in a direction across the path of the torpedo. The torpedo is thereby misdirected by the high level acoustic signal produced in the transducers slowly changing the location of the signal. The signal is interrupted to provide a silent period, such absence of a signal being interpreted by the torpedo as a miss causing the torpedo to initiate a turn and commence a search which will 'exhaust' the torpedo. This sequence is repeated while the torpedo is within a close range of the target.

Descriptors :   *COUNTERMEASURES, *SONAR, *PATENTS, ACOUSTIC HOMING, ACOUSTIC SIGNALS, ACOUSTICS, ATTACK, HOMING, HOMING TORPEDOES, PATHS, SEQUENCES, SIGNALS, SOUND, TARGETS, TIME, TORPEDOES, TRANSDUCERS

Subject Categories : Acoustic Detection and Detectors
      Military Intelligence

Distribution Statement : APPROVED FOR PUBLIC RELEASE