Accession Number : ADD017825

Title :   Tracking System and Method.

Descriptive Note : Patent, filed 15 May 95, patented 2 Jan 96,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Donald, James B ; Nuttail, Albert H ; Wilson, James H

Report Date : Jan 1996

Pagination or Media Count : 13

Abstract : A method and apparatus for detecting, processing and tracking sonar signals to provide bearing, range and depth information that locates an object in three dimensional underwater space. An inverse beamformer utilizes signals from a towed horizontal array of hydrophones to estimate a bearing to a possible object. A matched field processor receives measured covariance matrix data based upon signals from the hydrophones and signals from a propagation model. An eight nearest neighbor peak picker provides plane wave peaks in response to output beam levels from the matched processor. A five-dimensional M of N tracker identifies peaks within the specified limit of frequency, bearing change over time, range and depth to specify an object as a target and to display its relative range and depth with respect to the array of hydrophones.

Descriptors :   *SIGNAL PROCESSING, *SONAR, *SONAR SIGNALS, *PATENTS, *UNDERWATER TRACKING, OUTPUT, PROPAGATION, MODELS, TOWED ARRAYS, MATRICES(MATHEMATICS), PROCESSING EQUIPMENT, DEPTH, THREE DIMENSIONAL, BEAM FORMING, ACOUSTIC ARRAYS, INVERSION, HORIZONTAL ORIENTATION, COVARIANCE, HYDROPHONES, MATCHING, PLANE WAVES

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE