Accession Number : ADA215716

Title :   An Ocean Medium Pulse Propagation Model Based on Linear Systems Theory and the WKB Approximation.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Campbell, Peter R.

Report Date : JUN 1989

Pagination or Media Count : 154

Abstract : A general, modular, pulse propagation model for underwater acoustics that is based on linear systems theory for sound speed profiles as a function of depth is presented. The development and computer implementation of the model, together with results from preliminary computer simulation studies involving the transmission of CW and LFM pulses from a planar array of complex weighted point sources is reported. The studies examined free-space propagation problems (i.e. no boundaries) in homogeneous and inhomogeneous media using a transfer function based on the WKB approximation. The two main outputs from the model are the predicted complex acoustic field as a function of frequency and spatial location and the time-domain output electrical signal from each element in a receive planar array. Thesis. (rrh)

Descriptors :   *ACOUSTIC FIELDS, *ACOUSTIC VELOCITY, *COMPUTERIZED SIMULATION, *PROFILES, *PROPAGATION, *SPATIAL DISTRIBUTION, *UNDERWATER ACOUSTICS, ARRAYS, ELECTRICITY, HOMOGENEITY, LINEAR SYSTEMS, MODELS, OUTPUT, PLANAR STRUCTURES, POSITION(LOCATION), PULSES, SIGNALS, SIMULATION, SOURCES, THEORY, TIME DOMAIN, TRANSFER FUNCTIONS, WEIGHTING FUNCTIONS.

Subject Categories : Theoretical Mathematics

Distribution Statement : APPROVED FOR PUBLIC RELEASE