Utilization or reduction of the effects of sea clutter for real and synthetic aperture polarimetric radars
Abstract
The principal elements of the full wave solutions are summarized. The full wave solutions are invariant to coordinate transformations and they satisfy the reciprocity, realizability, and duality relationships in electromagnetic theory. Limiting forms of the full wave solutions are shown to reduce to the low frequency small perturbation solutions and the high frequency physical optics solution. Thus, the full wave solution provides the only direct relationship between the low frequency perturbation and the high frequency physical optics solutions. Tracing this relationship was a rather elusive endeavor, since even for surfaces that simultaneously satisfy the small perturbation limitation and the large radii of curvature restriction, these two solutions are not in agreement. Thus, there are no complications in applying the full wave solutions to scattering by composite surfaces with multiple scales of roughness, and there is no need to adopt hybrid (perturbed physical optics) solutions based on artificial decomposition of the surface into two surfaces with different scales of roughness. These hybrid solutions critically depend on the choice of the spatial wave number at which it is assumed that the separation occurs between the large and the small scale surface.
 Publication:

In AGARD
 Pub Date:
 1990
 Bibcode:
 1990urpn.agar.....B
 Keywords:

 Clutter;
 Coordinate Transformations;
 Physical Optics;
 Polarimetry;
 Seas;
 Surface Roughness;
 Synthetic Aperture Radar;
 Wave Scattering;
 Curvature;
 Decomposition;
 Electromagnetism;
 High Frequencies;
 Low Frequencies;
 Perturbation;
 Radii;
 Communications and Radar