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中文摘要：
介绍了非差运动学精密定轨的基本原理,比较分析了精密星历和钟差以及导航星座空间几何构形对GRACE卫星非差运动学定轨的影响。数值分析表明,不同IGS精密轨道对应的GRACE卫星运动学轨道精度相当,而30s间隔和5s间隔钟差对应的径向定轨精度分别为3.8cm和3.4cm,说明高采样率的精密钟差有助于提高非差运动学精密定轨的精度。
英文摘要：
We introduced the principles and influencing factors of the zero-difference kinematic POD,and analyzed the impacts of GPS orbits and clock products on the kinematic POD of GRACE.The results indicate that the precision of the kinematic orbits of GRACE is at the same level for the IGS precise ephemeris and the rapid ephemeris,which means that the precision of the GPS orbits have no influence on the GRACE＇s kinematic orbits.When using high-rate clock products with 30 s and 5 s interval,the RMS in radial direction are 3.8 cm and 3.4 cm respectively,which indicates that high-rate clocks product can improve the precision of kinemaitc orbits.
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