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为调整轨道或者姿态,卫星每隔一段时间会进行喷气或者动量轮卸载,相当于对卫星产生了附加推力.由于变轨过程的复杂性和变轨加速度测量的不确定性,在一般的定轨过程中,通常是不采用变轨期间的测轨数据.但是在特殊情况下如导航卫星的RDSS服务需要提供不间断的包含变轨弧段在内的连续星历.文中利用高精度高采样率的CAPS测距资料,对某GEO卫星包含变轨弧段在内的6天长弧段进行了定轨分析,着重讨论如何利用变轨期间的遥测数据建立变轨推力模型,并将推力模型加入到定轨的动力学模型中,进行长弧段定轨.研究还表明,即使没有准确的遥测信息,基于CAPS系统的高精度高采样率测轨数据,可以解算推力参数.计算结果表明两种方案均取得了良好的数据拟合效果,变轨弧段的轨道位置误差最大约为20m.
In order to adjust the orbit or attitude, the satellite will carry out the jet or momentum wheel unloading at regular intervals, which is equivalent to generating additional thrust on the satellite.Because of the complexity of the orbit changing process and the uncertainties of orbit acceleration measurement, In the process, the orbit data during the orbit change is usually not used, but in special cases, the RDSS service of navigation satellites needs to provide uninterrupted continuous ephemeris including the orbital arc, and the high precision and high sampling rate CAPS ranging data, the orbit analysis of a 6-day-long segment of a GEO satellite including orbital arcs is given, and the discussion focuses on how to use the telemetry data during orbit change to establish the orbit thrust model and add the thrust model to Orbit determination, the long arc orbit determination is carried out.The study also shows that even without accurate telemetry information, the thrust parameters can be calculated based on the CAPS system with high precision and high sampling rate.The calculated results show that both schemes Good data fitting results have been obtained. The maximum orbital error of the orbital arc is about 20m.