Accession Number : ADA134886
Title : Linear Time-Variant Space-Variant Filters and the WKB Approximation.
Descriptive Note : Interim rept. Oct 82-Oct 83,
Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Personal Author(s) : Ziomek,L J
PDF Url : ADA134886
Report Date : Oct 1983
Pagination or Media Count : 99
Abstract : Wave propagation in a random, inhomogeneous ocean is treated as transmission thru a linear, time-variant, space-variant, random communication channel. A consistent notation (vis-a-vis ad hoc), fundamental input-output relations, and various time-space transformations for both deterministic and random linear, time-variant, space-variant, filters are established. Using the method of separation of variables and the W.K.B. approximation, a time-invariant, space-variant, random transfer function of the ocean volume is derived. The ocean volume is characterized by a random index of refraction which is a function of depth. The index of refraction is decomposed into a deterministic component and a zero mean random component. In addition, two example calculations are made.
Descriptors : *Underwater acoustics, Acoustic waves, Wave propagation, Oceans, Acoustic filters, Refractive index, Autocorrelation
Subject Categories : Acoustics
Radiofrequency Wave Propagation
Distribution Statement : APPROVED FOR PUBLIC RELEASE