中文摘要：

采用土壤介电常数的四成分模型和雪的介电常数模型分别表示实际的地面和雪层的介电特性,应用指数型分布粗糙面模型和Monte Carlo方法模拟实际的粗糙地面,运用时域有限差分方法研究了雪层覆盖的粗糙地面与上方矩形截面柱的复合电磁散射问题.得出了复合电磁散射系数的角分布曲线,计算了双站复合散射系数随土壤与雪层粗糙度参数、介电参数、矩形截面柱几何参数、介电参数等的变化情况,并做了详细分析与讨论.得到了雪层覆盖的粗糙地面与上方矩形截面柱复合电磁散射特性.

英文摘要：

The dielectric properties of the actual land surface and snow deposit are described using the four-component model of dielectric constant of soil and the dielectric constant model of snow respectively.The actual rough land surface is simulated with the model of exponential type distribution rough surface and Monte Carlo method,the composite electromagnetic scatterings from the rough land surface covered with snow and the column with rectangular cross-section above it are studied using the finite-difference time-domain method,the curves of angular distribution of composite scattering coefficient are obtained,the bistatic composite scattering coefficient varying with the roughness parameter and dielectric parameter of soil and snow,the geometric parameter and dielectric parameter of the column with rectangular cross-section are calculated in detail.The characteristics of the composite scattering coefficient from rough land surface covered with snow and the column with rectangular cross-section above it are also obtained.