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- 2016
利用不同月球重力场模型分析嫦娥三号定轨精度
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Abstract:
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，100 km×100 km轨道重叠弧段精度约为22 m，和LP150Q，SGM150全阶次模型精度相当；对于100 km×15 km轨道，GL0660b模型截断至360阶次，重叠弧段精度约为21 m，优于LP150Q和SGM150计算结果
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