GRAIL月球重力场模型定轨性能分析
Orbit Determination Ability Analysis of the GRAIL Gravity Model
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摘要: 由最新GRAIL跟踪数据解算的月球重力场模型相较于之前的模型在分辨率和精度上有了巨大的飞跃,本文采用月球重力场模型GRGM660PRIM,通过与历史LP150Q和SGM150j模型对比,从轨道预报和精密定轨两个角度定量分析了GRGM660PRIM的定轨性能。计算结果表明,对于卫星轨道寿命预报,GRGM660PRIM并未体现出较大优势,与LP150Q和SGM150j相当;对于大倾角的Apollo 16子卫星的精密定轨,GRGM660PRIM体现出其高精度、高阶次的优势,双程Doppler测速残差RMS由1.36~1.48 mm/s降低至0.722 mm/s,三程Doppler测速残差RMS由1.67~1.69 mm/s降低至1.2 mm/s,定轨精度得到显著的提高。Abstract: The new GRAIL gravity model GRGM660PRIM has advanced in the aspect of resolution and degree when compared with historical lunar gravity field models. In this paper, we present a quantitative analysis of the orbit determination ability of the GRGM660PRIM in orbit prediction and precise orbit determination (POD). In a comparison with the LP50Q and SGM150j models, results show that the GRGM660PRIM is close to the level of the LP150Q and SGM150 in satellite lifetime prediction; in the Apollo 16 subsatellite POD, GRGM660PRIM shows its advantages at high degrees and precision, the residuals RMS of two Doppler decreases from 1.36~1.48 mm/s to 0.722 mm/s, and the three way Doppler residuals RMS decrease from 1.67~1.69 mm/s to 1.2 mm/s;the precision of orbit determination improves significantly. These conclusions can provide a reference for the upcoming Chinese Chang'E-5 mission and further lunar missions.
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