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从阶方差、谱域分析以及大地水准面自由空气重力异常3个方面分析了月球重力场模型LP150Q,LP165P与SGM150各自的特点及差异,研究结果表明,SGM150重力场在中高阶项上得到了明显改善,在远月面可以发现明显的重力异常正负交替的现象。另外,对“嫦娥二号”变轨试验期间的测轨数据进行了轨道解算和预报,比较不同重力场模型的精度影响,发现基于SGM150模型的解算结果优于基于LP150Q和LP165P的,在定轨弧段内有10m量级的精度提升,可用于高精度的月球探测器精密定轨。
The characteristics and differences of lunar gravity field model LP150Q, LP165P and SGM150 are analyzed from the aspects of order variance, spectral analysis and free-air gravity anomaly of the geoid. The results show that the gravitational field of SGM150 is obvious in middle and high-order terms Improvements in the far moon surface can be found obvious signs of alternating anomalous gravity anomaly. In addition, the orbit determination and prediction were carried out during the orbital experiment of Chang’e II orbit, and the accuracy of different gravitational field models was compared. It was found that the solution based on SGM150 model was better than that based on LP150Q and LP165P , Orbit arc within the order of 10m accuracy, can be used for high-precision lunar probe precision orbit.