Accession Number:

ADA244474

Title:

Improved Propagation Models Irregular Media

Descriptive Note:

Final rept. 7 Jan 1989-6 Jul 1991

Corporate Author:

VISTA RESEARCH INC MOUNTAIN VIEW CA

Personal Author(s):

Report Date:

1991-06-30

Pagination or Media Count:

16.0

Abstract:

In continuous random media, one invariably uses the parabolic approximation to the wave equation. Thus, the development of moment equations that characterize the random field proceeds from a model that excludes a priori wide-angle scattering and backscatter. While attempts have been made to rectify both limitations, the formulations used are intractable or inconsistent. It is desirable to use a formulation that accommodates backscatter and wideangle scatter at the outset. In discrete random media, the formalism developed by Flody, Lax, and Twersky is more often used. The problem development is setup so that a self-consistent computation of the complete multiple scattering interactions among all the scatters is accommodated. It is known that self- consistent interaction computations can be set up as solutions to differential equations as well as implicit summations of all interactions diagram methods. Whereas the continuous media problem generally proceed from a system of restricted differential equations, the discrete problem more often proceeds an exact diagram system. It is desirable to use a common formulation that preserves the self-consistent interaction fields but can be transformed to diagram form.

Subject Categories:

  • Acoustics
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE