Accession Number : ADP002736

Title :   The Effect of Turbulent Atmosphere on Backscattered Waves,

Corporate Author : ILLINOIS UNIV AT URBANA DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Yeh,K. C. ; Liu,C. H.

Report Date : AUG 1983

Pagination or Media Count : 6

Abstract : In radar detection of targets the backscattered waves are traveling through the same region as the incident wave. When the region is occupied by a turbulent atmosphere, the backscattered wave is therefore expected to be correlated with the incident wave. As a matter of fact, these two oppositely traveling waves are related through a reciprocity theorem. This reciprocity theorem is shown to be valid by using the Feynam path integral solution of the parabolic equation. For the problem at hand the path integral is just the propagator which enters naturally in calculations of the mutual coherence function. This mutual coherence function is evaluated for several cases: when the incident wave is a narrow or broad beam wave, and when the target is a single point or a random reflecting screen with finite correlation size. The aperture averaged mutual intensities are also evaluated.

Descriptors :   *Backscattering, *Narrow beams(Radiation), *Atmospheric motion, *Radar signals, *Turbulence, *Radar targets, Integrated systems, Reflectors, Screens(Woven materials), Atmospheres, Targets, Solutions(General), Paths, Traveling waves, Equations, Coherence, Parabolas, Radar, Waves

Distribution Statement : APPROVED FOR PUBLIC RELEASE