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Real-time LEO satellite clock estimation with predicted LEO satellite orbits constrained

文献类型：期刊论文

作者Xie, Wei3,4; Su, Hang3,4; Wang, Kan2,3,4; Liu, Jiawei3,4; Wu, Meifang2,3,4; Zou, Min2,3,4; El-Mowafy, Ahmed1; Yang, Xuhai2,3,4
刊名GPS SOLUTIONS
出版日期2024-10-01
卷号28期号:4页码:16
关键词Real-time Low Earth Orbit (LEO) Clock estimation Orbital constraints
ISSN号1080-5370
DOI10.1007/s10291-024-01723-6
英文摘要Low Earth Orbit (LEO) satellites can augment the traditional GNSS-based positioning, navigation and timing services, which require real-time high-precision LEO satellite clock products. As the complicated systematic effects contained in the LEO satellite clock estimates limit their high-precision mid- to long-term prediction, high-frequency LEO satellite clocks need to be estimated within a Kalman filter, resulting in a short prediction time for real-time applications. Compared to the clock estimation using Batch Least-Squares (BLS) adjustment, filter-based clock estimation experiences a lower precision. Increasing the model strength by introducing external orbital information, thus, de-correlating the orbital and clock parameters, will benefit real-time clock precision. In this contribution, reduced-dynamic LEO satellite orbits are first estimated using BLS adjustment in near real-time and predicted in the short term. The predicted orbits are then constrained during the Kalman-filter-based clock estimation process. The variance-covariance matrix of the introduced orbital errors is tested for different sets of values in the radial, along-track and cross-track directions when constraining orbits of different prediction times. One week of GPS data from the Sentinel-3B satellite in 2018 was used for validation of the proposed method. When weakly constraining high-accuracy predicted orbits within a prediction time of 20 min, i.e., with a standard deviation of the constraint set to 2-3 dm in the radial and cross-track directions, and 4-6 dm in the along-track direction, the estimated clock accuracy can be improved from about 0.27 to 0.23 ns, with a 13.4% improvement. Depending on the prediction period of the introduced orbits, the Signal-In-Space Range Error (SISRE) of the LEO satellite to Earth can also be improved, from about 9.59 cm without constraints, to 7.38-8.07 cm after constraining the predicted orbits, with an improvement of 16-23%. The improvements in the SISRE also indicate a better consistency between the real-time clock and orbital estimates.
WOS关键词GPS
资助项目Chinese Academy of Sciences[021GJHZ2023010FN] ; National Time Service Center, Chinese Academy of Sciences (CAS)[E167SC14] ; National Natural Science Foundation of China[12073034] ; National Natural Science Foundation of China[12203059] ; Special research assistant funding project, CAS[110400T0XW] ; Australian Research Council-Discovery Project[DP240101710]
WOS研究方向Remote Sensing
语种英语
WOS记录号WOS:001284880900001
出版者SPRINGER HEIDELBERG
资助机构Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Time Service Center, Chinese Academy of Sciences (CAS) ; National Time Service Center, Chinese Academy of Sciences (CAS) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special research assistant funding project, CAS ; Special research assistant funding project, CAS ; Australian Research Council-Discovery Project ; Australian Research Council-Discovery Project ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Time Service Center, Chinese Academy of Sciences (CAS) ; National Time Service Center, Chinese Academy of Sciences (CAS) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special research assistant funding project, CAS ; Special research assistant funding project, CAS ; Australian Research Council-Discovery Project ; Australian Research Council-Discovery Project ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Time Service Center, Chinese Academy of Sciences (CAS) ; National Time Service Center, Chinese Academy of Sciences (CAS) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special research assistant funding project, CAS ; Special research assistant funding project, CAS ; Australian Research Council-Discovery Project ; Australian Research Council-Discovery Project ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Time Service Center, Chinese Academy of Sciences (CAS) ; National Time Service Center, Chinese Academy of Sciences (CAS) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special research assistant funding project, CAS ; Special research assistant funding project, CAS ; Australian Research Council-Discovery Project ; Australian Research Council-Discovery Project
源URL[http://210.72.145.45/handle/361003/14482]  
专题国家授时中心_高精度时间传递与精密测定轨研究室
通讯作者Wang, Kan
作者单位1.Curtin Univ, Sch Earth & Planetary Sci, Perth, WA 6845, Australia
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Key Lab Time Reference & Applicat, Xian 710600, Peoples R China
4.Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Peoples R China
推荐引用方式
GB/T 7714		 Xie, Wei,Su, Hang,Wang, Kan,et al. Real-time LEO satellite clock estimation with predicted LEO satellite orbits constrained[J]. GPS SOLUTIONS,2024,28(4):16.
APA Xie, Wei.,Su, Hang.,Wang, Kan.,Liu, Jiawei.,Wu, Meifang.,...&Yang, Xuhai.(2024).Real-time LEO satellite clock estimation with predicted LEO satellite orbits constrained.GPS SOLUTIONS,28(4),16.
MLA Xie, Wei,et al."Real-time LEO satellite clock estimation with predicted LEO satellite orbits constrained".GPS SOLUTIONS 28.4(2024):16.

入库方式： OAI收割

来源：国家授时中心

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