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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 .
Integral equation method and half-space dyadic Green’s function are used to calculate the electromagnetic scattering vector of buried object.Firstly, the volume fraction equation of buried object is established by using the half-space electric field and the Green’s function.Then, The spatial deflexion is transferred to the integral number of the spectral integral of the Green’s function and the discrete zero-sum image method is used to approximate the remaining zero-order Sommerfeld integral to further obtain the closed form of each component of the dyadic Green’s function. The cumbersome numerical calculation of Sommerfeld integral makes the problem of bottleneck caused by the half space dyadic Green’s function computation get better when the reaction matrix is generated and the scattering field is calculated, thus greatly improving the electromagnetic response of the buried target Calculate efficiency, but also to ensure adequate accuracy.