Analysis of composite EM scattering based on accurate geometry modeling

An approach to studying composite EM scattering from 2-D rough surface and half-buried 3-D target is proposed in this paper, from accurate geometry modeling to RCS analysis. First, two dimensional rough surface is simulated with spectral method, which then is converted into a continuous curved surface through inverse engineering. Target model and rough surface model are combined together to be a very accurate composite CAD model, after which surface mesh is generated with the information of incidence wave frequency. Then physical optics method (PO) and multi-level fast multipole algorithm (MLFMA) are respectively employed to study the scattering problem. The results of single rough surface and combinative model are given and the results by the two different methods are compared.