不同重力场模型对嫦娥三号环月轨道的影响

Effect of Lunar Gravity Models on Chang'E-3 Orbit Determination

利用3种不同的月球重力场模型(LP165P、SGM150J和GL0900D),基于嫦娥三号实测超长基线干涉法(VLBI)数据分别进行嫦娥三号环月段定轨计算,通过轨道重叠分析评估了3种模型对不同环月轨道(100 km×100 km和100 km×15 km)的解算精度,分析不同阶次的重力场模型对轨道的影响,然后通过轨道预报分析3种模型的轨道预报能力,结果表明,GL0900D用于定轨及预报的精度优于其他两种模型。利用GL0900D重力场模型分别对嫦娥二号和三号的环月轨道进行确定和比较,结果表明,嫦娥三号的定轨精度明显优于嫦娥二号的定轨精度。

In this paper, three lunar gravity models,LP165 P,SGM150J and GL0900 D were evaluated through the orbit determination and prediction of Chang'E-3 with the Very Long Baseline Interferometry(VLBI)tracking data. The influence of gravity models with different degrees and orders on the orbit determination was also analyzed. The orbit overlap analysis and data post-residual were used to assess the orbit precision. Solutions of the 100 km×100 km and the 100 km×15 km orbits drew different conclusions. With the optimal model GL0900 D, the orbits of Chang'E-2 and Chang'E-3 were determined respectively,results of which showed that the orbit determination precision of Chang'E-3 was significantly better than that of Chang'E-2.