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按照月球表面环形山数目和形态的统计特征,数值构造了有环形山分布的月球表面地形.按月面地形坡度非均匀分布,提出由不规则三角形网格对月面地形进行剖分来表示月面数字高程.由Kirchhoff近似给出月球表面雷达回波的计算方法,数值模拟了有环形山分布的非均匀起伏月球表面的合成孔径雷达(SAR)成像.以Apollo 15着陆点地区月球表面真实的数字高程和Clementine光学数据为例,给出了Apollo 15地区模拟的SAR图像.最后,对模拟的月表SAR图像强度进行了统计验证,并与真实的月表SAR图像做了比较.
According to the statistical characteristics of the number and shape of the craters on the surface of the moon, the lunar surface topography with craters is numerically constructed. According to the non-uniform distribution of lunar surface topography, it is proposed that the lunar surface topography can be represented by an irregular triangular grid Based on the Kirchhoff approximation, a method of calculating the lunar surface radar echo is given and the numerical simulation of synthetic aperture radar (SAR) imaging of the lunar surface with anomalous craters is carried out. Taking the true digital elevation of lunar surface at Apollo 15 landing site Clementine optical data is used as an example to give a SAR image simulated in Apollo 15. Finally, the simulated lunar SAR image intensities are statistically validated and compared with the real moon-surface SAR images.