Accession Number : ADA195196

Title :   Methodologies for Resolving Anomalous Position Information in Torpedo Range Tracking Using Simulation.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Kroshl, William M

PDF Url : ADA195196

Report Date : Mar 1988

Pagination or Media Count : 162

Abstract : This thesis investigates the problem of resolving dual path records of torpedoes being tracked on an acoustic range using short baseline arrays. An acoustic signal is sent out by a torpedo at short intervals. This signal is then received by the four hydrophones of a short baseline array. Arrival time differences in the signal are used to determine an estimated position for the torpedo at the time the signal was emitted using spherical equations and acoustic raytracing. In those areas where two arrays can track a target simultaneously, two sets of estimated positions are generated. These estimates usually do not coincide. A simulation of the range is developed using actual range positions and sound velocity data. Deliberate errors are then range introduced into the sound velocity profile data and the timing data. Three methods of resolving the resulting positional ambiguity are presented. Each method is compared to the actual position for idealized (no deliberate error) and the deliberate error models. Keywords: Underwater Acoustics; Raytracing; Simulation; Torpedo; Underwater Range.

Descriptors :   *ACOUSTIC RANGES, *ACOUSTIC TRACKING, ACOUSTIC SIGNALS, ACOUSTIC VELOCITY, ANOMALIES, ACOUSTIC ARRAYS, ARRIVAL, BASE LINES, ERRORS, ESTIMATES, HYDROPHONES, INTERVALS, MODELS, PATHS, POSITION(LOCATION), PROFILES, RANGE(DISTANCE), RECORDS, SHORT RANGE(DISTANCE), SHORT RANGE(TIME), COMPUTERIZED SIMULATION, TIME, TORPEDOES, UNDERWATER TRACKING, UNDERWATER, POSITION FINDING, RAY TRACING, UNDERWATER TARGETS, UNDERWATER ACOUSTICS, ACOUSTIC DATA, AMBIGUITY, COMPUTER PROGRAMS, THESES

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE