A two-scale model for composite rough surface scattering

A new two-scale model is proposed for wave scattering from a composite surface. For each single scale surface roughness, we use a weighted sum of the newely developed statisticaal integral equation model and the second-order small slope approximation. With these two unifying model may capture the actual scattering mechanisms and lead to more accurate predictions. It holds the potential to bridge the gap between the regions of validity of the Kirchhoff approximation and the small perturbation model. The chosen simulation parameters suggest that the new two-scale model holds the potential to expand the validity regions of both its large scale and small scale components. The new model may have promising applications for electromagnetic scattering from the ocean surface, whose entire roughness spectrum can be disomposed into small- and large-scale components.