Accession Number : ADA182188

Title :   Application of a Modified Time Delay Spectrometry Technique in Modeling of Underwater Acoustic Propagation.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Prudhomme,Louis L

PDF Url : ADA182188

Report Date : Mar 1987

Pagination or Media Count : 62

Abstract : The analysis of sound propagating by multiple paths in an ocean at short ranges has been conducted using a Modified Time Delay Spectrometry (TDS) technique. In this version of TDS, a source driven by a linear FM slide and an HP3561A Dynamic Signal Analyzer are used to measure the amplitude as a function of frequency of signals traveling by different paths and having different arrival times. Two sets of data from the acoustic test ranges at the Naval Undersea Weapons Engineering Station were analyzed for different environment conditions to determine the relative amplitudes of the directly propagating and surface reflected signals. Comparisons with simple rough surface scattering theory showed reasonable agreement. Results and control software are presented and discussed. Recommendations for future applications are made. Keywords: Multipath acoustic propagation; Time delay spectrometry; Surface reflection; Theses.

Descriptors :   *ACOUSTIC RANGES, *FREQUENCY MODULATION, *MULTIPATH TRANSMISSION, *SOUND TRANSMISSION, *PROPAGATION, *REFLECTION, *UNDERWATER ACOUSTICS, RANGES(FACILITIES), TEST FACILITIES, COMPUTER PROGRAMS, CONTROL, LINEAR SYSTEMS, PATHS, AMPLITUDE, SURFACES, ARRIVAL, FREQUENCY, SIGNALS, THESES, DELAY, SPECTROMETRY, TIME INTERVALS

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE