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“嫦娥二号”实施小行星探测试验,与小行星交会时卫星距离地球约700万km,此飞行阶段卫星定轨计算精度非常依赖于测轨数据的弧长。卫星最后两次轨道修正只有13天时间,而实现小行星拍照试验指标要求轨道精度优于15km。如何利用有限的测轨数据实现高精度定轨是小行星探测试验必须解决的重要问题。针对控后跟踪弧段有限的特点,以10月9日控后飞行阶段为分析对象,设计了不同的定轨策略,并比较定轨计算的精度。计算结果表明,融合轨控前后的测轨数据开展定轨计算,可以有效提升定轨计算精度。利用控前1个月和控后10天的测轨数据进行定轨计算与控后6周数据定轨计算精度相当。
“Chang’e II ” implementation of asteroid exploration test, and the asteroid intersection satellite about 7 million km from the Earth, the orbit determination accuracy of this orbit is very dependent on the arc length of the orbital data. The last two orbital corrections for satellites took only 13 days, while achieving asteroid photogrammetric test specifications required orbit accuracy better than 15 km. How to use the limited orbit data to achieve high-precision orbit determination is an important issue to be solved in the asteroid exploration test. Aiming at the limited characteristics of the arc segment after control, taking the flight stage controlled by Oct. 9 as the analysis object, different orbit determination strategies are designed and the accuracy of orbit determination is compared. The calculation results show that the orbit determination data before and after the integration of orbit control can be used to make orbit determination, which can effectively improve the accuracy of orbit determination. The orbit determination using the orbit data of 1 month before and 10 days after the control is equivalent to the orbit determination accuracy of 6 weeks after the control.