Scattering from randomly oriented scatterers with strong permittivity fluctuations
Abstract
Strong permittivity fluctuation theory is used to solve the problem of scattering from a medium composed of completely randomly oriented scatterers under a low frequency limit. Gaussian statistics are not assumed for the renormalized scattering sources. Numerical results on effective permittivity are illustrated for oblate and prolate spheroidal scatterers and compared with the results for spherical scatterers. The results are consistent with discrete scatterer theory. The effective permittivity of a random medium embedded with nonspherical scatterers shows a higher imaginary part than the spherical scatterer case with equal correlation volume. Under the distorted Born approximation, the polarimetric covariance matrix for the backscattered electric field is calculated for halfspace randomly oriented scatterers. The nonspherical geometry of the scatterers shows significant effects on the crosspolarized backscattering returns, and the correlation coefficient between HH and VV returns. The polarimetric backscattering coefficients can provide useful information in distinguishing the geometry of scatterers.
 Publication:

Journal of Electromagnetic Waves and Applications
 Pub Date:
 January 1990
 DOI:
 10.1163/156939390X00717
 Bibcode:
 1990JEWA....4..983Y
 Keywords:

 Electromagnetic Scattering;
 Fluctuation Theory;
 Permittivity;
 Statistical Distributions;
 Backscattering;
 Born Approximation;
 Half Spaces;
 Scattering Coefficients;
 Physics (General)