地下三維目標(biāo)電磁散射的矩量法計(jì)算
Scattering from 3-D Targets in the Subsurface Using MOM
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摘要: 該文給出了一種用層狀介質(zhì)中的混合勢(shì)積分方程(MPIE)和基于RWG基函數(shù)的矩量法計(jì)算地下三維目標(biāo)電磁散射的精確快速實(shí)施方法。對(duì)MPIE的RWG矩量法的開發(fā)、計(jì)算性能做了研究，尤其是對(duì)其中的多個(gè)不同形式的Sommerfeld積分的快速全波數(shù)值離散復(fù)鏡像計(jì)算方法做了仔細(xì)研究。該文的實(shí)施方法退化到自由空間后的計(jì)算結(jié)果與解析解Mie Series吻合的很好，而且地下平板的計(jì)算結(jié)果也與以往公布結(jié)果吻合得很好，證實(shí)了該文實(shí)施方法的可行、高效、精確。除此以外，該文還計(jì)算了其它形狀目標(biāo)在不同大小、不同埋藏深度、以及不同地層媒質(zhì)下的電磁散射特征。Abstract: In this paper, an accurate and efficient implementation approach of the Method of Moments (MOM) is developed to compute scattering from 3-D targets in the subsurface, which is based on the Mixed Potential Integral Equation (MPIE) in layered media and the RWG basis function. The implementation skill and computing performance of the proposed approach are studied in detail. In particular, how to efficiently calculate various different Sommerfeld integrals (SIs) is numerically investigated with the discrete complex images technique. The computed results of the targets in free space are in agreement with Mie Series results and the computed results of subsurface flat are also in agreement with the published data, which shows the reliability, efficiency and accuracy of the developed approach. Furthermore, the EM scattering of other shaped targets is computed at different size, buried depth, and subsurface medium.
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