GPS卫星钟差及观测数据采样间隔对LEO卫星定轨精度影响

针对GPS卫星钟差及观测数据间隔对LEO卫星运动学和约化动力学定轨的影响问题进行了分析，并使用CODE（the Center for Orbit Determination in Europe）30 s、5 s间隔GPS卫星钟差分别进行了30 s和10 s间隔观测数据的LEO卫星定轨实验。结果表明，使用5 s间隔卫星钟差（10 s间隔观测数据）相比30 s间隔卫星钟差（30 s间隔观测数据）进行GRACE卫星精密定轨，约化动力学定轨精度提高了16%，运动学定轨精度提高了8.8%；使用30 s间隔卫星钟差和10 s间隔观测数据的定轨精度最低；对于30 s间隔观测数据，使用30 s或5 s间隔卫星钟差的定轨精度基本一致。

Impact of Sample Rate of GPS Satellite Clock and Observation Data on LEO GPS-Based Precise Orbit Determination

The influence of GPS precise clock and observation data sampling internal on LEO kinematic and reduced-dynamic precise orbit determination (POD) was analyzed. The several experiments of LEO POD were carried out respectively by using the 30 s or 5 s sampling interval GPS precise clock from CODE and the 30 s or 10 s GPS observation data. The results show that 5 s GPS clock and 10 s observation data comparing with 30 s clock and 30 s observation data, the accuracy of reduced-dynamic POD is improved by 16%, and the kinematic POD is 8.8%. The accuracy of LEO POD is the worst by using 10 s observation data and 30 s GPS clock. For 30 s observation data, the accuracy of LEO POD by using 30 s GPS clock is consistent with 5 s GPS clock products from CODE.