FULL-WAVE SOLUTIONS FOR ROUGH-SURFACE BISTATIC RADAR CROSS-SECTIONS -COMPARISON WITH SMALL PERTURBATION, PHYSICAL OPTICS, NUMERICAL, AND EXPERIMENTAL RESULTS

In this paper, full wave solutions are derived for the like- and cross -polarized electromagnetic fields diffusely scattered by two-dimension al rough surfaces. These expressions for the diffuse scattered fields are used to obtain the random rough-surface cross sections. The rough surface is characterized by a Gaussian joint probability density funct ion for the surface heights and slopes at two points. These full wave results are compared with the associated small-perturbation results an d physical optics results. They are also compared with experimental an d numerical results (based on Monte Carlo simulations). The earlier as sumption that the surface height and slopes can be considered to be un correlated is examined. The impact of using the large-radii curvature assumption and including self-shadow is also considered.