Computations of scattering cross sections for composite surfaces and the specification of the wavenumber where spectral splitting occurs
Abstract
The scattering cross sections for composite random rough surfaces are evaluated using the full wave approach. They are compared with earlier solutions based on a combination of perturbation theory which accounts for Bragg scattering, and physical optics which accounts for specular point theory. The full wave solutions which account for both Bragg scattering and specular point scattering in a selfconsistent manner are expressed as a weighted sum of two cross sections. The first is associated with a filtered surface, consisting of the larger scale spectral components, and the second is associated with the surface consisting of the smaller scale spectral components. The specification of the surface wavenumber that separates the surface with the large spectral components from the surface with the smaller spectral components is dealt with in detail. Since the full wave approach is not restricted by the limitations of perturbation theory, it is possible to examine the sensitivity of the computed values for the backscatter cross sections to large variations in the value of the wavenumber where spectral splitting is assumed to occur.
 Publication:

IEEE Transactions on Antennas and Propagation
 Pub Date:
 September 1983
 DOI:
 10.1109/TAP.1983.1143129
 Bibcode:
 1983ITAP...31..698B
 Keywords:

 Backscattering;
 Electromagnetic Scattering;
 Scattering Cross Sections;
 Spectral Theory;
 Surface Roughness Effects;
 Depolarization;
 Perturbation Theory;
 Specular Reflection;
 Wave Scattering;
 Communications and Radar