Electromagnetic Scattering From Targets On Ocean Like Surfaces

The electromagnetic (EM) scattering from rough surfaces such as ocean-like surfaces has been extensively treated, and the methods for low-grazing-angle (LGA) scattering problems have been studied especially.Method of moments (MOM)-based Monte Carlo calculations are used in determin--ing the scattering of targets on ocean-like surface. In case of LGA, the computational cost is critical, where the traditional MOM does not fitted, so the generalized forward--backward (GFB) is introduced to improve MOM. Most studies available focus on the scattering from sea surface in free space, and the free space Green's function is used to obtain an integral equation. However, in order to calculate the contribution of ocean to EM scattering of ships, the half space green's function instead of free space green's function is utilized here to compute the scattering from ships on ocean lighted by a plane-wave.The integral equation is solved by MOM together with GFB algorithm. The surface current and bistatic RCS are computed as a function of the incidence angle, frequency and surface roughness.It is proved that GFB is an effective tool to solve the problems of EM scattering of targets on ocean like surface and the half space model proposed here is more accurate than prototype.