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基于“嫦娥二号”卫星再拓展试验的设计轨道,研究各种摄动力对轨道确定精度的影响,得出的结论是:若要达到km量级的轨道确定精度,必须考虑除天王星和海王星之外所有大行星以及日月的质点引力。文章进一步利用数值分析法研究再拓展任务的轨道确定精度,分析结果表明:基于目前的测控条件,使用30 d以上的测轨弧段可以得到稳定可靠的轨道解,而短弧(小于20 d)稳定轨道的获取需要VLBI(甚长基线干涉)测轨数据支持;当“嫦娥二号”距离地球700万km时,测控精度可优于30 km;虽然每天测轨弧段的增加可以改善轨道精度,但是当增加到8 h以上时,定轨精度将不再有明显改善。
Based on the orbit of “Chang’e II” satellite reextension experiment, the influence of various perturbation forces on orbit determination accuracy is studied. The conclusion is: if the orbit determination accuracy of km level is to be met, All the planets outside of Neptune and the gravitational attraction of the sun and the moon. Based on the current measurement and control conditions, a stable and reliable orbital solution can be obtained by using the orbital arcs above 30 d, while the short arc (less than 20 d) The acquisition of stable orbit requires the support of VLBI (Very Long Baseline Interferometry) orbit data; when “Chang’e II” is 7 million km from the earth, the measurement and control precision can be better than 30 km; although the daily increase of the measuring arc can be improved Orbit accuracy, but when increased to more than 8 h, orbit determination accuracy will no longer be significantly improved.