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嫦娥二号卫星于2011-06～2012-04实施拓展试验,运行在绕日地系L2点的Lissajous轨道上。拓展试验期间嫦娥二号卫星距离地球最远约1 700 000km,随着卫星与地球距离的增加,测轨数据的噪声水平也明显增加;另一方面,距离的增加使得飞行过程中动力学约束逐渐减弱,测轨几何可确定性变差,定轨计算的难度也相应提升。这两个因素对测控系统提出了更为严格的要求。描述了嫦娥二号卫星拓展试验期间的轨道计算情况并进行评估。分析表明,在当前的测控条件下,逃逸初期轨道计算的精度优于km级,速度精度优于1cm/s,而随着飞行距离的增加,轨道计算所需的测轨弧段也相应增加,在转移阶段后期,连续使用20d以上的测轨数据进行定轨计算,通过弧段搭接与轨道预报比较,内符合满足2km的精度水平。
Chang’e II satellite in 2011-06 ~ 2012-04 implementation of expansion test, run around the Earth Lissajous orbit L2. During the extension of the experiment, the Chang’e II satellite is as far as 1 700 000 km away from the Earth. As the distance between the satellite and the Earth increases, the noise level of the orbit data also increases significantly. On the other hand, the increase of the distance makes the dynamic constraint gradually Weakened, the accuracy of the orbital geometry deteriorated, and the difficulty of the orbit calculation also increased accordingly. These two factors put more stringent requirements on the measurement and control system. Describes and evaluates orbital calculations during the Chang’e II satellite expansion test. The analysis shows that under the current conditions of measurement and control, the accuracy of early orbit calculation is better than km and the speed precision is better than 1cm / s. However, the orbital arcs of orbit calculation increases with the increase of flight distance, In the late stage of the transfer phase, the orbit determination data is continuously used for more than 20 days, and the accuracy of 2 km is satisfied by comparing the arc overlap with the orbit prediction.