缝隙电磁散射的算法研究

【作者】 赵亚敏；

【导师】 侯新宇；

【作者基本信息】 西北工业大学 ， 电磁场与微波技术， 2004， 硕士

【摘要】 随着雷达散射截面(RCS)减缩技术的发展，缝隙对目标散射行为的影响日益突出。 本文通过不同的模型研究分析了缝隙电磁散射的多种基本算法，包括二维无限长窄缝的准静态公式、基于积分方程和矩量法的二维缝隙的散射分析、有限长直缝散射计算的物理基公式及准静态近似结合行波散射计算三维缝隙的散射等，并通过算例，讨论了这些算法的特点。论文重点研究了FDTD算法在无限大导电平面上缝隙的散射计算中的应用，该算法对入射波和平面反射波进行了处理和修正，最终，在FDTD散射公式中只计算缝隙的散射。经过验证，与未修正FDTD算法的结果相比，该算法的精度明显得以提高。更多还原

【Abstract】 With the increasing development of Radar Cross Section(RCS) reduction techniques, scattering from the slots or grooves have provided more important contribution to a target’s scattering behavior.Some basic methods about the slot’s electromagnetic scattering are studied and analyzed in this thesis. These methods include the quasi-static approximation formulation applied in 2-d infinite long slot, the 2-d slot scattering analysis based on integral equation and the Method of Moments, a physical basis formulation for a finite-length trough, and a quasi-static approximation combined with travel wave’s scattering calculated scattering from a 3-d crack. Through many examples, these methods’ characteristics are discussed. In this paper, the emphasis is the application of the FDTD arithmetic in slot’s scattering. This method modifies incidence wave and the reflected wave from conducted plane, and that result in the FDTD scattering formulations are only about the scattering field of slot. After validation, the modified has obviously improved the basic FDTD arithmetic’s precision.更多还原