Abstract:

It is known that the expensive step in the conventional hybrid method of the Kirchhoff approach (KA) and the method of moment (MoM) is to calculate the interaction between objects and the rough surface. A highly efficient hybrid method is proposed for calculating the monostatic scattering by objects above a rough surface. Similar with the conventional hybrid KA MoM, the KA is used to calculate the scattering by the rough surface, and the MoM with multilevel fast multipole algorithm (MLFMA) 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 is truncated for calculating the interactions between the objects and the rough surface, which depending on the specular reflection of the large scale rough surface. The accuracy and efficiency of the proposed method are studied by numerical experiments. The results show that by executing the truncation, the memory and the computation time are significantly reduced.