利用不同月球重力场模型分析嫦娥三号定轨精度  

Analysis on Orbit Determination of CE-3 with Different Lunar Gravity Field Model

作　　者：昌胜骐 黄勇[1,3] 李培佳[1] 胡小工[1,2] 

机构地区：[1]中国科学院上海天文台,上海200030 [2]中国科学院大学研究生院,北京100049 [3]中国科学院上海天文台行星科学重点实验室,上海200030

出　　处：《武汉大学学报（信息科学版）》2016年第11期1427-1432,1439,共7页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(11473056;11403076);上海市科学技术委员会(3912DZ22733001);国家863计划(2012AA121603)~~

摘　　要：利用最新的月球重力场模型GL0660b对嫦娥三号探测器定轨的影响进行分析,并与LP150Q和SGM150模型进行了比较。首先计算了三个重力场模型的功率谱,分析了系数阶方差和误差阶方差的性质,GL0660b大大提升了月球重力场模型的阶数和解算精度;然后讨论了各模型在月球外部空间不同高度处截断到不同阶次的重力异常分布。利用这三个重力场模型对嫦娥三号环月期间的轨道进行解算,计算结果表明,利用GL0660b模型截断至150阶次,100km×100km轨道重叠弧段精度约为22m,和LP150Q,SGM150全阶次模型精度相当;对于100km×15km轨道,GL0660b模型截断至360阶次,重叠弧段精度约为21m,优于LP150Q和SGM150计算结果。With the latest lunar gravity field model GL0660 band LP 150 Q,SGM150,we analyze the influence of different lunar gravity field models on orbit determination of CE-3.Firstly,the power spectrum and error spectrum of these three models are discussed.GL0660 bmodel improves the spatial resolution and precision of spherical harmonic coefficients significantly.Then the free-air gravity anomaly of these three lunar gravity models are compared by truncating to different orders and degreesat different height.These three gravity field models are applied in the precision orbit determination.The results show that position overlap differences of 100km×100km orbit are about 22 m with GL0660 bmodel truncated to 150 orders and degrees,the same level as those using LP150 Q model and SGM150 model in full orders and degrees.For 100km×15km orbit,position overlap differences with GL0660 bmodel truncated to 360 orders and degrees are at a level of 21 m,which is better than those using LP150 Qand SGM150.

关 键 词：月球重力场模型 GL0660b模型 嫦娥三号 定轨 

分 类 号：P128.1[天文地球—天体测量] V412.41[天文地球—天文学]