摘要
本文讨论了几种散射体的空域分解法的迭代形式。考虑到散射体的某一子域和几个子域产生的散射场有解析表达式或较高精度的近似解，给出三种迭代方式，以进一步减少存贮量和计算量。在数值结果及分析中，首先对一种由一个半圆柱和两片有限宽的导带构成的比较典型的二维曲面劈在ＴＭ波正投射时利用三种迭代方式所得的后向散射场的数值结果和计算量与存贮量进行了比较。然后讨论了该散射体各组成部分的散射场对整个散射体总的散射特性的影响，给出了一种由于外部振荡而产生的副瓣值超过立瓣值的现象，表明互耦可能引起散射场的很大变化。然后，给出了不同介质组合体与介质和导体组合体在ＴＭ波入射时的后向散射截面。
Iterative schemes of spatial decomposition method for various objects is discussed in the paper, three kinds of iterative schemes are presented to further reduce the memory requirement and CPU time on the baals of the analytical or approximate solutions to the scattering field of some subzones. In the part of numerical results and their analysis, at first, one kind of typical curve wedge consisted by a semicylinder and two conducting strips is considered. Numerical results of backscattering cross secrtion as well as memory requirements and CPU time by three iterative schemes are compared with those by method of moments, the influence of each subzone on the scattering characteristics of foe whole scatterer are discussed, the phenomenon that the value of the first sidelobe exceeds that of the mainlobe is presented and explained by exterior oscillation, it shows that ignorance of mutual coupling may causegreat computational error. Secondly, the numerical results of spatial decomposition method applied to the composite objects are presented to show its validity and versatilily.
出处
《电波科学学报》
EI
CSCD
1995年第3期40-45,共6页
Chinese Journal of Radio Science
关键词
空域分解法
组合体
散射特性
Spatial decomposition method, Complex object scattering characteristics, Iterative scheme, exterior
