单中继星单低轨卫星的联合定轨精度分析

针对由单中继星和单低轨卫星组成的联合定轨系统,给出了系统内不同轨道卫星摄动项的选取方案和卫星间的可见性判别模型。在模拟出含有白噪声的四程测距观测数据文件的基础上,研究了测距精度和采样弧段对联合定轨中高、低轨卫星定轨精度的影响。得出如下结论:联合定轨更有利于对低轨卫星的轨道改进;同样的采样时间条件下,测距噪声越小定轨精度越高,并且采样时间越短它的影响越明显;同样的测距噪声条件下,所用资料的采样时间越长精度越高,但当测距精度很高时,TDRS达到最好定轨精度所需的采样时间相应有所缩短。并在定出轨道后进行了轨道预报,分析了轨道预报的趋势及精度。

Precision Analysis to Combined Orbit Determination of Single-single System

The paper aimed at the system composed of a single TDRS and a single low-orbit satellite.Different perturbing forces were selected for different satellites,and the model to the visibility of the two satellites was given.Based on the four-way ranging surveying files that were simulated,we mainly did some research on the effect of the measurement precision and the sampling time to the precision of the orbit determination,and some conclusions were drawn.Just like the combined orbit determination was more efficient for low-orbit satellite.In condition of the same sampling time the smaller the surveying noise was the higher precision was obtained,which was more obvious for short sampling time,and in condition of the same surveying noise the longer the sampling time was the higher precision was obtained,which could be achieved for shorter sampling time when the surveying precision was high enough.At last we also studied on the trend and precision of the orbit prediction.