钟跳探测优化的低轨卫星运动学精密定轨  

Improved precise kinematic orbit determination of LEO by detecting clock-jumps

作　　者：李开元 张守建[2] 张春光 LI Kaiyuan;ZHANG Shoujian;ZHANG Chunguang(State Grid Location Based Service Co.,Ltd.,Beijing 100000,China;School of Geodesy and Geomatics,Wuhan University,Wuhan 430000,China)

机构地区：[1]国网思极位置服务有限公司,北京100000 [2]武汉大学测绘学院,武汉430000

出　　处：《导航定位学报》2024年第5期55-61,共7页Journal of Navigation and Positioning

基　　金：国家重点研发计划项目(2021YFB2501100);自主可控D北斗替代关键技术及应用研究专项(SGIT0000KJJS2400568)。

摘　　要：为了进一步提升低轨卫星接收机钟差约束后的轨道精度,提出一种钟跳探测优化的低轨卫星运动学精密定轨方法:针对重力回溯及气候实验卫星(GRACE)和GRACE继任卫星(GFO)中存在频繁的纳秒级钟跳,给出鲁棒的钟跳探测方法和带有钟差约束的运动学精密定轨方法;然后对一个月的GRACE和GFO数据进行处理,验证方法的有效性。结果表明,钟跳次数可达208次,最大值约为0.7 m;降低钟跳历元的钟差约束权重后,和喷气推进实验室的约化动力学轨道相比,轨道跳变可被消除。In order to further improve the orbit determination accuracy of the receiver clock constraint on low Earth orbiter(LEO),the paper proposed an improved precise kinematic orbit determination of LEO by detecting clock-jumps:contraposing the existing frequent ns-level clock jumps in the gravity recovery and climate experiment(GRACE)and GRACE follow-on(GFO)satellites,a robust clock jump detection method and a modified kinematic precise orbit determination(KPOD)method with clock variation constraint were introduced;then GRACE and GFO data of one month were processed to verify the validity of the method.Results showed that there could be up to 208 clock jumps,with a maximum value of approximately 0.7 meters;furthermore,by reducing the weight of clock constraint over epochs with clock jumps in the KPOD,compared to the reduced dynamic orbit of Jet Propulsion Laboratory(JPL),the orbit jumps could be erased.

关 键 词：运动学精密定轨(KPOD) 全球定位系统(GPS) 模糊度固定 钟差约束 接收机钟跳 

分 类 号：P228[天文地球—大地测量学与测量工程]