The use of the FFT for the efficient solution of the problem of electromagnetic scattering by a body of revolution
The use of the FFT for the efficient solution of the problem of electromagnetic scattering by a body of revolution
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DOI：
10.1109/8.52253
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发表时间：
1988-06
期刊：
影响因子：
--
通讯作者：
S. Gedney;R. Mittra
中科院分区：
文献类型：
--
作者：
S. Gedney;R. Mittra
作者考虑进一步提高大型旋转体电磁散射（BOR）的计算效率，以使其能够实际解决大型旋转体问题。尽管所提供的方法可以应用于多层介电体，但考虑了完美导电（PEC）BOR的电磁散射问题。在大多数使用的方法中，矩量法矩阵元素的生成消耗了大部分计算时间。展示了如何通过使用快速傅立叶变换 (FFT) 操作矩阵元素的表达式来显着减少该时间。还提出了一种用于提取出现在矩阵对角线的被积函数内的格林函数奇点的技术。提取进一步增强了 FFT 的使用并提供了精确的分析表达式。使用这种方法，与现有算法相比，对于大型物体，计算时间至少可以提高一个数量级。>
The authors consider the further enhancement of the computational efficiency in the electromagnetic scattering of large bodies of revolution (BOR) with a view to making it practical to solve large-body problems. The problem of the electromagnetic scattering of a perfect electrical conducting (PEC) BOR is considered, although the methods provided can be applied to multilayered dielectric bodies. In most methods used, the generation of the elements for the method-of-moments matrix consumes a major portion of the computational time. It is shown how this time can be significantly reduced by manipulating the expression for the matrix elements using the fast Fourier transform (FFT). A technique is also presented for extracting the singularity of the Green's function that appears within the integrands of the matrix diagonal. The extraction further enhances the use of the FFT and provides an exact analytic expression. Using this method, the computational time can be improved by at least an order of magnitude for large bodies, compared to existing algorithms.>