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.
作者
李开元
张守建
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)
出处
《导航定位学报》
CSCD
北大核心
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)。
