A Fast Algorithm for Modeling Vector Electromagnetic Scattering from Buried Dielectric Objects

A Fast Algorithm for Modeling Vector Electromagnetic Scattering from Buried Dielectric Objects
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埋地电介质矢量电磁散射建模的快速算法

DOI:
10.1002/cjg2.644
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发表时间:
2005
期刊:
Chinese J. Geophysics. (Acta Geophysica Sinica)
影响因子:
--
通讯作者:
Nie Zaiping
Nie Zaiping
中科院分区:
其他
文献类型:
--
作者:
Xu Liming;Nie Zaiping

文献摘要

参考文献

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本文采用积分方程法结合半空间并矢绿色函数的有效算法计算了埋地介质目标的电磁正向散射。给出了并矢绿色函数的简明表示,建立了埋地介质目标的积分方程。通过将空间微分算子移至积分符号之外,其余部分采用离散复镜像法计算,得到了绿色函数的封闭形式。由于不需要对索末菲积分进行数值计算,克服了计算反应矩阵和散射场的瓶颈。该方法提高了介质目标正演计算的效率,并保证了足够的精度。
Forward electromagnetic scattering from buried dielectric objects is computed by the integral equation method in conjunction with efficient algorithm for half-space dyadic Green's functions. Concise representations of dyadic Green's functions are presented to establish the integral equation for buried dielectric objects. Through moving the spatial differential operator to the outside of the integral sign and computing the rest part by the discrete complex image method, closed forms of Green's functions are obtained. The bottleneck during calculating reaction matrix and scattering fields is overcome since it is not necessary to process the numerical evaluation of Sommerfeld integrals. The proposed method enhances the efficiency of the forward calculation of buried dielectric objects and enough accuracy can be guaranteed.
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