A Bi-iterative Model Electromagnetic Scattering from a Ship Floating on Sea Surface

In this paper the composite scattering from a perfectly electric conducting (PEC) ship floating on sea surface is investigated by a bi-iterative physical optics (PO) method. In present method both the scatterings of partially buried ship and underlying sea surface are calculated by the PO method. And a bi-iterative strategy is considered, including the mutual interaction among points on ship in direct scattering and the mutual interaction between ship and sea surface in coupling scattering. In addition, the coupling interaction between partially buried ship and sea surface contains two parts: (1) the upper surface of sea surface and the upper part of ship; (2) the lower surface of sea surface and the lower part of ship. In numerical simulations, the bistatic normalized radar cross section (NRCS) of the composite model are computed by the bi-iterative PO method and are compared with those by the conventional method of moments (MOM). The results show the proposed method has a good accuracy and can greatly reduce the computational time and memory requirement.