Accession Number : ADP006130

Title :   Rough Surface Propagation and Scatter with Applications to Ground Wave Remote Sensing in an Ocean Environment,

Corporate Author : MEMORIAL UNIV OF NEWFOUNDLAND ST JOHN'S

Personal Author(s) : Walsh, John ; Srivastava, Satish K.

Report Date : MAY 1987

Pagination or Media Count : 15

Abstract : Some properties of the vector integral equation representing a general formulation for propagation and scattering from rough surfaces are discussed. It is shown that under certain conditions the equation may be reduced to a Volterra equation of the second kind in the normal component of the surface field for an initially unexcited surface, and hence some confidence may be had in a Neumann series or successive approximation solution. Using the formulation, the backscattered field solutions at ground wave frequencies and resulting radar cross section solutions derived previously for a model of the ocean surface are presented and discussed. The source assumed is a vertical pulsed dipole. The choice of receiving antenna is left arbitrary. the second order cross section contains new terms in addition to those provided by existing theories. The additional terms may become very significant in certain Doppler frequency regions and hence required for ocean clutter estimation in the detection of certain types of surface targets. Some of the new predictions have been verified experimentally.

Descriptors :   *GROUND WAVES(ELECTROMAGNETIC), *ELECTROMAGNETIC SCATTERING, *RADIO TRANSMISSION, OCEAN SURFACE, SURFACE ROUGHNESS, VOLTERRA EQUATIONS, BACKSCATTERING, CLUTTER, INTEGRAL EQUATIONS, CANADA, SYMPOSIA.

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE