基于SLR的GRACE卫星定轨中大气密度模型对轨道精度的影响

The Study of the Track Accuracy Effection by the GRACE Satellite Orbits Atmospheric Density Models Based on the SLR Technotogy

以GRACE卫星为例,分析比较利用SLR观测资料进行卫星定轨时,采用不同大气密度模型对GRACE卫星定轨精度的影响;将定轨结果与采用GPS的定轨结果进行比较,分析与GPS定轨结果的差异。实验证明,大气密度模型的选择对定轨结果的影响很明显,同时,比较了基于SLR的定轨结果与采用GPS的定轨结果,发现大气密度模型采用DTM的情况与采用GPS的轨道差异最小,差异的量级为米级。

In this paper,set the GRACE satellite as an example,analysis and comparison of the SLR observation data of satellite orbit determination,the effects of different atmospheric density model of orbit determination accuracy of GRACE satellite orbit determination;at the same time,the results and the GPS to define the constant comparison result difference analysis of rail,rail results and GPS set.Experiments show that,atmospheric density model selection effect on the orbit results are obvious,and comparing the results with SLR based on orbit by orbit results of GPS,it is found that the atmospheric density modelusing DTM and adopting GPS track the smallest difference,and the difference of the order is meters.