摘要
本文应用FD-TD技术分析计算了地下电磁散射问题。导出了有耗媒质中的数值色散关系式,并导得两种不同媒质交界面上的差分格式。对几种典型吸收边界条件进行了讨论、比较。在计算中,输入激励源分别采用了高斯脉冲和正弦平面波两种形式。给出了不同材料、形状的散射体位于不同埋地深度时的时域散射波形,以及不同埋地深度导体上电流的稳态值。并将本文的结果分别与已有的理论结果进行了分析比较。
In this paper,the Finite—Difference Time—Domain (FD—TD)method is introduced to calculate the subsurface EM scattering problems. The dispersion relation of the FD—TD method in lossy medium is developed. The difference formula for the interface of two different media are derived. Comparison is made for several typical absorbing boundary conditions. The incident plane wave source has been taken a Gaussian pulse and a sinusoidal wave, respectively. The pulse response behaviors of scatterers with different medium,shape and location are obtained. The induced steady state currents on buried conductors are obtained. Comparison between FD—TD's results and other's ones is taken,respectively.
出处
《电波科学学报》
EI
CSCD
1991年第4期1-9,共9页
Chinese Journal of Radio Science
