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本文讨论了在现代雷达测高技术中应用的统计随机平坦地面短脉冲散射的理论模型。简述了建立褶积模型的各种假设条件。根据卫星测高系统所需要的一般假设条件,推导出了近垂直入射的脉冲响应和平均反向散射功率的简单表达式。特别指出了一般的二维地面积分可以得出闭式解。提出了这些结果在雷达测高技术中的两种应用,即在雷达天线瞄准角测定中以及在瞄准角和地面粗糙度效应的高度偏差校正中的应用。此外,还指出了这些结果可以直接用来分析Weissman所提出的双频系统。文章最后提出了一种长脉冲高度表和双频系统的组合系统。
This paper discusses the theoretical model of statistical random flat terrestrial short pulse scattering used in modern radar altimetry. The various assumptions for establishing convolution models are briefly described. According to the general assumptions needed by satellite altimetry system, a simple expression of impulse response and average backscattering power of near vertical incidence is deduced. In particular, it is pointed out that the general two-dimensional surface area can be obtained closed solution. Two applications of these results in radar altimetry are put forward, that is, they are used in the determination of aiming angle of radar antenna and in the height deviation correction of aiming angle and surface roughness effect. In addition, it is pointed out that these results can be directly used to analyze the dual-frequency system proposed by Weissman. Finally, the paper presents a combination of long pulse altimeters and dual frequency systems.