Accession Number : ADA193284

Title :   Passive Multipath Target Tracking in an Inhomogeneous Acoustic Medium.

Descriptive Note : Doctoral thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Shefi, Amnon

PDF Url : ADA193284

Report Date : Dec 1987

Pagination or Media Count : 238

Abstract : Tracking a maneuvering acoustic source using multipath (MP) arrivals in an inhomogeneous (IH) ocean medium is investigated. Errors introduced by a horizontally stratified sound speed profile are quantitatively evaluated. A new method of converting MP time difference of arrivals to depth and range which accounts for the IH effect is developed and evaluated. A 3-D target tracker previously used in MP tracking is modified in order to remove estimation biases and improve computational efficiency. Tracking performance is demonstrated using extensive simulation and shown to be greatly improved. Keywords: Three dimensional; Prefilters; Underwater; Maneuvering targets.

Descriptors :   *MOVING TARGETS, *MULTIPATH TRANSMISSION, *PASSIVE SYSTEMS, *TRACKING, COMPUTATIONS, EFFICIENCY, MANEUVERABILITY, NOISE, OCEANS, SIMULATION, SOURCES, TARGETS, THESES

Subject Categories : Target Direction, Range and Position Finding

Distribution Statement : APPROVED FOR PUBLIC RELEASE