| This paper mainly discusses the realization of the large complex targets electromagnetic scattering computation.High frequency scattering predication can accelerate electromagnetic simulation computation. This paper discusses electromagnetic scattering predication using Physical Optical (PO), Geometrical Optical (GO) and Physical Theory of Diffraction (PTD). The simulation computation includes three parts, geometrical modeling, electromagnetic simulation computation and acceleration using graphic hardware.Geometrical info, topology info and electromagnetic info are required for electromagnetic computation. And allowing for the characteristics of every modeling method, boundary representation as the form of girding is adopted to model the targets. The design pattern of Tools and Commands is used in Graphical User Interface design.Electromagnetic simulation computation uses three principal scattering mechanisms, including facet contribution, edge diffraction and multi-scattering. Physical Optics is adopted to calculate the scattering of facets. Incremental Length Diffraction Coefficients (ILDC) is adopted to calculate the contribution of edge diffraction. In order to improve the accuracy of calculation, multi-scattering is discussed, based on the two former contributions and ray-tracing method. Geometrical Optics (GO) and Physical Optics (PO) are used to calculate the multi-reflection between facets and facets. The simulation results testify the validity of the above methods.This paper also discusses using computer graphic hardware to accelerate electromagnetic simulation computation.After integrating these parts, we develop an electromagnetic predication software system emX. The results show that the predication is quite accurate and fast. |
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