利用SLR数据检核GLONASS卫星最终轨道

Validation of GLONASS Satellite Final Orbit with SLR Measurements

采用由EDC提供的2015-01-01~2015-12-31的SLR标准点观测数据进行GLONASS卫星最终轨道(CODE提供)检核,分别按照卫星PRN号和不同测站对检核结果进行统计分析。结果表明,不同卫星的检核效果参差不齐,跟卫星的服役年限有关,较新的卫星检核结果较好,第一轨道面的卫星检核结果最好;检核结果中存在一定的系统误差,且大部分的激光测距比最终轨道反算的站星距要短;利用SLR检核2015年全年GLONASS轨道精度总体优于3.3cm,激光观测精度总体优于1.2cm。

In this paper, SLR observations are used to validate the CODE final orbit of GLONASS sat- ellites. The CODE final orbits of GLONASS are evaluated using the SLR data from January 1, 2015 to December 31, 2015 of EDC. The validation is statistically analyzed according to different satellite PRN and SLR sites. The results show that validations are uneven, which is related to the service life of the satellite. The new satellites have better validation results than satellites of the first track orbit by GLONASS. The site-satellite distance measured with SLR is shorter than that from final orbit and site coordinates. There remain small systematic errors, and the cause of these biases is not yet fully clear. The validations show that SLR observation accuracy is about 1.2 cm for GLONASS satellites. The accuracy of GLONASS satellite orbit validated by SLR date is mostly better than 3.3 cm.