Investigating slanted double bounce scattering mechanisms based on scattering models

In this paper, we investigate the double bounce radar backscattering from building walls not aligned in the azimuth direction (i.e., slanted double bounce scattering) based on scattering models. We apply the Fresnel equation for reflections from the building wall, and then the bistatic small perturbation model developed by Ulaby for ground scattering. Our analysis indicates that scattering matrix is not symmetrical for the path from radar to wall to ground and back to radar, but adding the reverse path from radar to ground to wall and back to radar makes the scattering matrix symmetrical. The effect on the polarization orientation estimation for an urban scene using L-band E-SAR will be analyzed.