
Accession Number : AD0703226
Title : LARGEDOMAIN DISCRETE INTEGRATION TECHNIQUES FOR THE WAVE EQUATION AS AN AID IN THE CALCULATION OF PROPAGATION LOSS AND THE STUDY OF ADAPTIVE ACOUSTIC ARRAYS.
Descriptive Note : Doctoral thesis,
Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
Personal Author(s) : Johnson,Roy Martin
Report Date : OCT 1969
Pagination or Media Count : 313
Abstract : Work was undertaken on two interrelated problems: (1) the theory and application of algorithms for the discrete integration of the acoustic wave equation in large, multidimensional, variableparameter domains and, (2) the automatic synthesis of adaptive acoustic arrays for the detection and estimation of received acoustic signals which are incident from such domains. It is shown that the steadystate integration of large domains may be partitioned into subdomain integrations for slowlyvarying variable parameter domains. A new method of integration based upon the Fast Fourier Transform is given. A new method for obtaining closed form coefficient expressions for the Fast Fourier Transform is shown and illustrated. The results of a general computerdisplay simulation program for the Widrow feedforward algorithm are given. Several limitations and possible modifications to the Widrow procedure are given. The use of Kalmantype filters as an alternative method is introduced. (Author)
Descriptors : (*UNDERWATER SOUND, *SOUND TRANSMISSION), SONAR ARRAYS, ALGORITHMS, ADAPTIVE SYSTEMS, FOURIER ANALYSIS, INTEGRAL TRANSFORMS, PARTIAL DIFFERENTIAL EQUATIONS, COMPUTER PROGRAMS, THESES
Subject Categories : Acoustics
Distribution Statement : APPROVED FOR PUBLIC RELEASE