【作者】 李光亚；

【导师】 张民；

【作者基本信息】 西安电子科技大学 ， 无线电物理， 2010， 硕士

【摘要】 本文研究了目标电磁散射的混合算法,提高电大目标电磁散射的计算效率,主要工作和结果包括:1、介绍了计算目标电磁散射的基本方法,着重讨论了矩量法(MoM)、物理光学法(PO)和迭代物理光学法(IPO),并给出每一种方法的数值算例。2、讨论了MoM计算一维粗糙面的方法。研究了基于电流基的二维混合算法,推导出此混合算法的计算公式,并采用此混合算法计算了一维粗糙面上目标的复合散射截面。通过不同的数值算例讨论了影响此混合方法的主要因素。3、推导出基于三角面元的PO的基本公式,在此基础上把目标划分成物理光学法区域和矩量法区域。考虑电流连续性,结合基于RWG基的矩量法,得到了用于计算任意三维目标电磁散射的混合算法公式,并计算了组合体目标的雷达散射截面。混合法和MoM的数值算例进行了比较,结果显示混合算法具有更高的计算效率。更多还原

【Abstract】 In this thesis, the hybrid algorithm for electromagnetic (EM) scattering of the object is studied, which improved the calculated efficiency of the electric large target. The main work and results are as follows:1. The basic method of calculating electromagnetic scattering is discussed. The method of moment (MoM), physical optics method (PO) and iterative physical optics method (IPO) are highlighted. The numerical examples of each method are given.2. The way to calculate the EM scattering of one dimensional rough surface by MoM is discussed. The two-dimensional hybrid current-based method is presented in detail, and the formulation of this hybrid algorithm is derived. Then the bistatic scattering of an object located on one dimensional rough surface is computed by this hybrid algorithm. The major influencing factors of this hybrid method are discussed in detail by the numerical results.3. The formulation of PO based on triangular facets is derived, and the object is subdivided into MoM region and PO region further. The hybrid expressions for the EM scattering from the arbitrary shape three-dimensional target are obtained by using the combination of PO and MoM. For the purpose of the continuity of currents, the MoM is selected the RWG basis function. At last, the radar cross section (RCS) of the composite target is computed by the proposed hybrid method. Numerical results are compared with the MoM results and shows that the proposed scheme is more efficient.更多还原