Accession Number : ADA134886

Title :   Linear Time-Variant Space-Variant Filters and the WKB Approximation.

Descriptive Note : Interim rept. Oct 82-Oct 83,


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