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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。
The impact of Chang’e III detector orbit determination is analyzed using the latest lunar gravitational field model GL0660b and compared with LP150Q and SGM150 models. Firstly, the power spectra of three gravitational field models are calculated and the properties of coefficient order variance and error order variance are analyzed. GL0660b greatly improves the order and solution accuracy of the lunar gravity field model. Secondly, Truncated to different orders of gravity anomalies. Using these three gravitational field models to solve the orbit of Chang’e III during the lunar month, the calculation results show that the accuracy of the overlapped arc of 100km × 100km orbit is about 22m with the GL0660b model being truncated to 150 orders, and the LP150Q and SGM150 For the 100km × 15km orbit, the GL0660b model is truncated to 360 orders and the accuracy of overlapping arcs is about 21m, which is better than the results of LP150Q and SGM150.