【作者】 张炜；

【导师】 龚书喜；

【作者基本信息】 西安电子科技大学 ， 电磁场与微波技术， 2006， 硕士

【摘要】 本文主要对开口腔体结构的散射机理及各种计算开口腔体散射的方法进行了介绍和讨论，分析了各算法的优缺点。着重对开口腔体电磁散射计算的复射线展开(CRE)法和迭代物理光学(IPO)法进行了讨论和研究。复射线展开法成功利用复源点产生的场拟合出了平面波，通过射线追踪求解出了轴向场，并利用近轴近似法计算远区场，最终求得开口腔体的RCS。在利用迭代物理光学法计算简单腔体结构的RCS时，本文成功的引入了有限元中的简化积分的方法，降低了程序的复杂度，加快了计算的时间。文中在对复射线法和迭代物理光学法进行深入探讨的基础上给出了简单开口腔体模型的RCS计算结果，结果表明这两种方法在计算腔体散射中是行之有效的。本文还针对复杂腔体结构提出了CRE和IPO方法的相应的改进设想，但由于时间和精力有限并没有作详细讨论，这还有待今后作进一步研究。更多还原

【Abstract】 The paper mainly introduces and discusses the mechanism of cavity scattering and the different methods for calculating cavity RCS, with their advantages and shortages analyzed. And it puts emphasis on the analysis of the CRE (Complex Ray Expansion) and IPO (Iterative Physical Optics).With the CRE method, complex ray expansion of plane waves is derived successfully. The RCS of the target is got through an application of the paraxial approximation in finding the far field after calculating the electromagnetic field in the axis direction by ray tracing. In the calculation of RCS of simple cavities with IPO, the method of predigest integral in FEM is introduced successfully, which results in predigestion of the program and reduction of calculating time. Based on the analysis of CRE and IPO, the RCS computational results of some simple cavity models are presented in the paper, which show that the CRE and IPO are efficient methods in cavity scattering.The dissertation puts forward some ideas of improving CRE and IPO according to the problem of complex cavity. The limitation of time and energy does not allow a careful discussion of those ideas, which remain to be a topic requiring further research in the future.更多还原