Accession Number : ADD015089

Title :   Method of Active Sonar Detection of a Stationary Target.

Descriptive Note : Patent, Filed 28 Sep 90, patented 1 Oct 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Gittings, Dan

Report Date : 01 Oct 1991

Pagination or Media Count : 7

Abstract : A method of active sonar detection of a stationary target in the water from aboard a moving vessel. A moving vessel having an active sonar system transmits a series of sonic pings out into the water. The transmitted series generates a corresponding series of reflections. Each of the reflections contains (1) acoustic reverberation and noise, (2) reflections from moving objects and (3) reflections from a stationary target. Each of the reflections in the series is digitized and stored in a matrix memory. The reflections are shifted in the matrix memory based upon how fast the vessel is travelling between successive pings. Each of the columns in the matrix memory are then summed such that the summation attenuates the acoustic reverberation and noise as well as the reflection from any moving objects and generates an identification of the stationary target. (Author)

Descriptors :   ACOUSTICS, DETECTION, MOTION, MOVING TARGETS, REFLECTION, REVERBERATION, SONAR, STATIONARY, TARGETS, WATER

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE