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

doi:10.1007/s10291-024-01723-6

	Real-time LEO satellite clock estimation with predicted LEO satellite orbits constrained
	Xie, Wei 1,2; Su, Hang 1,2; Wang, Kan 1,2,3; Liu, Jiawei 1,2; Wu, Meifang 1,2,3; Zou, Min 1,2,3; El-Mowafy, Ahmed 4; Yang, Xuhai 1,2,3
	2024-10-01
发表期刊	GPS SOLUTIONS
ISSN	1080-5370
卷号	28 期号:4 页码:16
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.
关键词	Real-time Low Earth Orbit (LEO) Clock estimation Orbital constraints
资助者	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
DOI	10.1007/s10291-024-01723-6
关键词[WOS]	GPS
语种	英语
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]
资助者	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
WOS研究方向	Remote Sensing
WOS类目	Remote Sensing
WOS记录号	WOS:001284880900001
出版者	SPRINGER HEIDELBERG
引用统计
文献类型	期刊论文
条目标识符	http://210.72.145.45/handle/361003/14482
专题	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.Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Peoples R China 2.Chinese Acad Sci, Key Lab Time Reference & Applicat, Xian 710600, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Curtin Univ, Sch Earth & Planetary Sci, Perth, WA 6845, Australia
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.