指数型分布粗糙地面电磁散射的FDTD研究

用Wang-Schmugge模型计算土壤介电常数，采用指数型粗糙面模拟实际的粗糙地面，用时域有限差分方法（FDTD）研究了指数型分布粗糙地面的电磁散射特性。通过数值计算获得了不同散射角时的双站散射系数，讨论了粗糙地面均方根、相关长度、土壤湿度和入射波波长对双站散射系数的影响。数值计算结果表明：粗糙地面高度均方根、相关长度、土壤湿度和入射波长对双站散射系数的影响复杂。

Study on Electromagnetic Scattering from Rough Land Surface with Exponential Type Distribution Using FDTD

The model of Wang and Schmugge was used for calculating the permittivity of soil. The exponential type distribution rough surface was simulated natural rough land surface, and the electromagnetic scattering from the exponential type distribution rough land surface was investigated using FDTD. The bistatic scattering coefficient with＂ various scattering angle was obtained by numerical calculation. The influences of the root mean square and correlation length of rough land surface, the moisture capacity of soil, and the length of incidence wave on the bistatic scattering coefficient were discussed. The numerical results showed that the influences of the root mean square and correlation length of rough land surface, the moisture capacity of soil, and the length of incidence wave on the bistatic scattering coefficient were very complex.