历元间相位差分运动学定轨精度影响分析

摘要

运用自编的GNSS_LEO_KPP低轨卫星运动学定轨软件,分别解算了GRACE_A和GRACE_B卫星DOY220/2011至DOY226/2011共7天的观测数据,通过与JPL事后精密轨道进行比较,其最终运动学轨道精度为10～20 cm.研究结果表明:初轨质量对最终运动学轨道质量高低具有一定影响,可以采用迭代循环运动学轨道作为先验轨道,当迭代循环次数达到五次左右时,最终的运动学轨道精度可以保持在分米甚至亚厘米级.%The kinematic orbit determination of LEO satellite software named GNSS_LEO_KPP is developed, and the observation data of GRACE_A and GRACE_B satellites in 7 days from DOY220/2011 to DOY226 / 2011 are calculated. Compared with the JPL precise orbits, the accuracy of final kinematic orbit can reach 10-20 cm. The results show that: the priori orbit quality has a certain level of impact on the final kinematic orbit quality, so we could use the iterative loop kinematic orbit as a prior orbit, and the final kinematic orbit accuracy can be maintained in decimeter or sub-centimeter level.