MONTE-CARLO SIMULATIONS OF LARGE-SCALE COMPOSITE RANDOM ROUGH-SURFACESCATTERING BASED ON THE BANDED-MATRIX ITERATIVE APPROACH

Scattering of a TE incident wave from a perfectly conducting one-dimen sional composite random rough surface is studied. A composite random s urface contains roughness of more than one scale. With the recently de veloped efficient numerical technique known as the banded-matrix itera tive approach, we are able to study large-scale composite roughness wi th two correlation lengths that are many times different from each oth er. It is shown that small-scale roughness, with its large rms slope, rather than large-scale roughness, with its small rms slope, can domin ate bistatic scattering. It is also shown that backscattering enhancem ent can also exist in a composite rough surface.