中文摘要：

为了研究孔径雷达探测下山区地形起伏及地表粗糙度对于电磁波传播的影响,由于山区大尺度、高复杂性的特点使散射特性参数计算往往具有较低的效率。建立了较为高效的孔径雷达电磁波散射率性能的数值仿真的完成解决方案。利用蒙特卡罗的数值仿真,构建山区地形模型并对地表高密度剖分,应用UV快速算法加速矩量法MOM求解山区后向散射、吸收率等散射参数得到精确解。结果表明,山区的双站散射系数与平地产生10~20d B的偏差,吸收率与后向散射系数受山区坡面方向、高度、地表粗糙度影响较大,通过定量分析认为孔径雷达考虑地形影响因素能更好得到山区信息。

英文摘要：

In order to study the effects of topographic relief and surface roughness of the mountains on the propagation of electromagnetic wave by using the aperture radar,this article established a relatively effective complete solution of a numerical simulation on the properties of aperture radar electromagnetic wave scattering. Based on Monte Carlo numerical simulation,we constructed a mountainous terrain model and highly subdivided the density of the earth＇s surface. We used UV fast algorithm and MOM to calculate scattering parameters of the backward scattering and absorption rate in mountainous terrain and obtained the accurate solution. It shows that the bistatic scattering coefficient of the mountains has a deviation of 10 - 20 d B compared with the flat terrain. Its absorption rate and backward scattering coefficient are affected by the direction of the slope surface,height,and surface roughness of the mountainous area. After a series of quantitative analysis,we hold that,we can get better information of the mountains by using aperture radar which includes the topographic factors.