Bistatic Scattering from a Sea-Like One-Dimensional Rough Surface with the Perturbation Theory in HF-VHF Band

We investigate the scattering of waves from a rough surface. From the analytical theory of rough surface green´s function based on the extension of the diagram method of Bass, Fuks and Ito, wi.th the smoothing approximation, numerical results are presented for a sea spectrum and compared with a benchmark method by considering a one-dimensional perfectly-conducting gaussian rough surface. The effects of multiple scattering due to the surface roughness are incorporated systematically into the solution through an effective surface impedance. In addition, bistatic scattering coefficients are presented with the first- and second-orders conventional small perturbation method. This study will be useful for remote sensing of the ocean surface, especially when the transmitter is close to the surface.