摘要
利用积分方程方法以及半空间并矢格林函数的快速算法对埋地目标体矢量电磁散射进行正演计算 .首先 ,利用半空间电场并矢格林函数建立起埋地目标体的体积分方程 .然后通过将空间偏导转移至格林函数谱域积分的积分号之外 ,并采用离散复镜像方法来近似余下的零阶索末菲积分 ,进一步得到并矢格林函数各个分量的闭合形式 .由于避免了对索末菲积分的繁琐数值计算 ,使得生成反应矩阵和计算散射场时由半空间并矢格林函数计算带来的瓶颈问题得到较好的克服 ,因而极大地提高了埋地目标体电磁响应正演计算效率 ,同时也能保证足够的精度 .
Forward electromagnetic scattering by buried objects is computed with the integral equation method and efficient algorithm for half-space dyadic Green's functions. Firstly, half-space dyadic Green's functions are given to establish the integral equation for buried dielectric objects. After getting the spatial differential operator out of the integral sign and computing the rest with the discrete complex image method, a closed form of Green's functions can be obtained. The avoidance of numerical evaluation of Sommerfeld integrals overcomes the bottleneck probably resulted from the calculation of Green's functions when filling reaction matrix and calculating scattering electric fields. The proposed method enhances the efficiency of forward calculation of buried dielectric objects and acceptable accuracy can be guaranteed.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第1期209-215,共7页
Chinese Journal of Geophysics
基金
国家自然科学基金项目 (10 1760 0 6)资助
关键词
电磁散射
埋地目标体
半空间并矢格林函数
索末菲积分
离散复镜像方法
Electromagnetic scattering, Buried dielectric object, Half-space dyadic Green's functions, Sommerfeld integral, Discrete complex image method.
