Costs and Cost Scaling in Time- uation Analysis of Electromagnetic Scattering
Costs and Cost Scaling in Time- uation Analysis of Electromagnetic Scattering
复制标题
电磁散射时间分析中的成本和成本缩放
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
M. Bluck
中科院分区：
文献类型：
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作者：
S. Dodson;S. Walker;M. Bluck
1.多波长物体的散射计算代价昂贵，而且计算成本高达入射频率的6次方。传统的积分方程式时间域法的代价是以五次幂为尺度的。这里描述了对IETD方法的修改，其提供了降低成本比例的前景，可能是频率的三次幂，并相应地大幅降低了成本。这种方法利用了照明的脉冲性质，这导致在电学上较大的物体上，在大多数情况下，身体的表面场都很小。忽略这些会在一定程度上增加错误，但可以大幅降低成本和存储需求。在所示的例子中，获得了接近两个数量级的成本降低，成本降低的因素本身随着机身大小的大约平方而增加；存储需求基本上可以忽略不计。
1. Abstract Computation of scattering from multi-wavelength bodies is expensive, and costs scale with up to the sixth power of incident frequency. Conventional integral-equation time-domain methods have costs scaling with the fifth power. Here are described modifications to the IETD approach that offer the prospect of a reduction in cost scaling, to possibly the third power of frequency, and an associated large reduction in cost. The approach exploits the pulsed nature of the illumination, which results in surface fields that are small most of the time over most of the body, on bodies that are electrically large. Neglect of these produces some modest increase in error, but allows large reductions in cost and storage requirements. In the examples shown, cost reductions by amounts approaching two orders of magnitude are obtained, with the factor by which costs are reduced itself increasing with roughly the square of the body size; storage requirements are rendered essentially negligible.