摘要
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—1．2m，～10m，一145m．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一杰克逊盆地和南极区域的阿门德森一甘斯温特盆地是月面II型质量瘤区域．
When calculating the lunar digital elevation model by using LAM data of Chang＇E-1 lunar orbiter, the radical error of measurement in lunar mass center fixed coordinate is one kind of the key error sources. For LAM, two stages of oscillators, with one from satellite bus system and one from LAM itself, supplied time synchronization, timing and frequency standard of lunar altimetry. The independent unstable oscillations of them created the relevant errors to LAM. We analyzed the time slips and drifts in data time tags, estimated the possible systematic bias of reference frequency of LAM oscillator. Then we calibrated the effects of them on LAM data. The budgets of these three kinds of error sources are 0.7-1.2 m, -10 m and ~145 m, respectively. Using the calibrated LAM data, a new 360 orders and degrees lunar topography model, CLTM-s03, has been obtained. By combining the new DEM model of the moon with CEGM02 lunar gravity model, a couple of middle scale type II lunar mascon basins, Fitzgerald-Jackson and Amundsen-Ganswindt, have been newly identified.
出处
《中国科学：物理学、力学、天文学》
CSCD
北大核心
2013年第11期1438-1447,共10页
Scientia Sinica Physica,Mechanica & Astronomica
基金
中国科学院月球与深空探测重点实验室
航天飞行动力学国防技术重点实验室
宇航动力学国家重点实验室研究基金资助
