Highly Efficient Hybrid Method for Computing the Backscattering from Objects Above a Dielectric Rough Surface

A highly efficient hybrid method of the Kirchhoff approach (KA) and the method of moment (MoM) is proposed for calculating the backscattering monostatic radar cross section(RCS) of conducting objects above a dielectric rough surface. Similar to the conventional hybrid KA-MoM, the KA is used to calculate the scattering by the rough surface and the MoM is applied to calculate the scattering by the objects. The main difference between the proposed method and the conventional KA-MoM algorithm is that the size of the rough surface has been truncated when calculate the interactions between the objects and the rough surface is conducted, for depending on the specular reflection of the smooth surface. By executing the truncation, the memory and the computation time is significantly reduced.