Abstract: A hybrid method is proposed for the analysis of compound scattered fields between the sea surface and a 2-D target. The Kirchhoff current and scattered field of the rough sea surface are evaluated by using the MOMI (Method of Ordered Multiple Interactions), the polarization current on the target and the scattered field are given by MOM. Associating with the reciprocity theorem, the second-order coupling scattered fields between the rough sea surface and a 2-D cylinder above it are calculated. The size of the system of linear equations produced by the hybrid method becomes much smaller than that by the conventional MOM, so the hybrid method saves the computer memory and reduces the computation time. Numerical results show the validity of the hybrid method and the computational time of our method is only about 12％ that by MOM.

Key words: electromagnetic scattering, method of ordered multiple interactions, reciprocity theorem