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在利用“嫦娥”一号绕月卫星激光高度计LAM载荷数据获取月面高程时,测量数据在月球质心固连坐标系中的径向误差是主要的观测误差来源之一.数据分析表明,“嫦娥”一号探测器和LAM载荷的使用了两级晶体振荡器,它们的独立工作导致的星-地时间同步和飘移将给激光测高数据带来误差.本文对激光高度计LAM数据中存在的时标漂移、卫星轨道径向误差以及LAM晶体振荡器地面定标的系统整体偏差等进行了分析和修正,实现了对激光高度计数据的外部标定,三类误差来源的大小范围分别是0.7–1.2 m,~10 m,~145 m.在此基础上得到了新的360阶次的地形模型CLTM-s03.利用新得到的地形模型发现菲兹杰拉德-杰克逊盆地和南极区域的阿门德森-甘斯温特盆地是月面II型质量瘤区域.
The radial error of the measured data in the lunar centroid solid-state coordinate system is one of the main sources of observational error when using lunar altitude data from lunar satellite altimetry LAM load data of “Chang’e I.” Data analysis shows that, The two-stage crystal oscillator is used in the Chang’e-1 detector and the LAM load, and the star-ground time synchronization and drift caused by their independent work will bring errors to the laser altimetry data.In this paper, the laser altimeter LAM data The drift of satellite time scale, the radial error of satellite orbit, and the overall system deviation of LAM crystal oscillator ground calibration are analyzed and corrected. The external calibration of the laser altimeter data is achieved. The size of the three types of error sources are 0.7-1.2 m, ~ 10 m, ~ 145 m. Based on this, a new 360-degree terrain model CLTM-s03 was obtained. The newly obtained terrain model was used to find the Fijgre-Jackson basin and the Antarctic region The Amundsen-Gansevoort Basin is the lunar Type II mass tumor area.