Accession Number : ADP006114

Title :   Geometrical Theory of Diffraction for High-Frequency Coherence Functions in a Weakly Ramdom Media with Inhomogeneous Background Profile,

Corporate Author : POLYTECHNIC UNIV FARMINGDALE NY WEBER RESEARCH INST

Personal Author(s) : Mazar, R. ; Felsen, L. B.

Report Date : MAY 1987

Pagination or Media Count : 16

Abstract : The localization of high-frequency wave propagation around ray trajectories, and the reflection and (or) diffraction of these local plane wave fields by boundaries, inhomogeneities and (or) scattering centers has been combined via the Geometrical Theory of Diffraction (GTD) into one of the most effective means of analyzing high-frequency wave phenomena in complex deterministic environments. These constructs are here incorporated into a stochastic propagation and diffraction theory for statistical moments of the high-frequency field in a weekly fluctuating medium with inhomogenous background profile, provide that the correlation length of the fluctuations is small compared with the scale of variation, but large compared with the local wavelength in the fluctuation-free background. Canonical problems of deterministic GTD furnish the propagators and the local reflection, refraction and diffraction coefficients that relate incoming to outgoing wavefields.

Descriptors :   *DIFFRACTION ANALYSIS, RAY TRACING, HIGH FREQUENCY, COHERENCE, CAUSTICS, CONVERGENCE ZONES, REFLECTION, SCATTERING, SYMPOSIA.

Subject Categories : Radiofrequency Wave Propagation
      Electricity and Magnetism
      Optics
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE