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本文把求解半空间散射问题的FDTD技术与地波传播理论相结合，研究任意复杂目标的地波散射特性。入射地波设置在FDTD计算区域中的总场边界上并在散射场输出边界面上提取散射近场数据，然后利用等效及镜像原理，计算无地波衰减时的远区散射场，通过引入地波衰减因子，把该远区散射场转换为远区地波散射场。文中给出了方法验证例子以及一个较复杂目标的单站RCS计算结果。
In this paper, the FDTD technique for solving the half-space scattering problem is combined with the ground-wave propagation theory to study the ground-wave scattering characteristics of any complex target. The incident ground wave is set on the total field boundary in the FDTD calculation area and the scattered near-field data is extracted on the output boundary of the scattering field. Then, the far-field scattering field without attenuation of ground waves is calculated by using the equivalent and mirroring principle. Ground wave attenuation factor, the far-field scattering field into far-field ground wave scattering field. The paper gives examples of method validation and the results of a single station RCS with a more complex target.