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LEO Satellite Clock Modeling and Its Benefits for LEO Kinematic POD

文献类型：期刊论文

作者Wang, Kan2,3; El-Mowafy, Ahmed1; Yang, Xuhai2,3
刊名REMOTE SENSING
出版日期2023-06-01
卷号15期号:12页码:22
关键词Low Earth Orbit (LEO) clock modeling Precise Orbit Determination (POD) USO
DOI10.3390/rs15123149
英文摘要High-accuracy Low Earth Orbit (LEO) satellite clock and orbital products are preconditions to realize LEO augmentation for high-accuracy GNSS-based positioning on the ground. There is a high correlation between the orbit and clock parameters in the kinematic Precise Orbit Determination (POD) process. While future LEO satellites are planned to be equipped with better clocks, the benefits of modeling high-stability LEO satellite clocks are not yet thoroughly investigated, particularly when mid- to long-term systematic effects induced by the complex LEO relativistic effects and the external environment remain in the clocks. Through clock modeling, this study attempts to reduce not only the short-term noise of radial kinematic orbits, but also mis-modeled effects caused by, e.g., real-time GNSS orbital and clock errors. To explore the benefits of clock modeling, the clocks need to be first detrended by the mid- to long-term systematic effects. While over-detrending limits the orbital improvements, weak detrending would also hamper strong clock modeling and easily lead to performance degradations. A balance between the strengths of the detrending and the model thus needs to be investigated for different clock types. In this study, the Piece-Wise Linear (PWL) model of different time lengths and a 2.5-state filter with different strengths (h values) are tested using real data from GRACE FO-1 with an Ultra-Stable Oscillator (USO) on board. Using the CNES real-time GPS products, it was found that when detrending the clocks with a smoothing window of 300 to 500 s, one could generally expect an improvement larger than 10% in the estimation of radial orbits when applying a PWL model with a length from 300 to 1200 s. Improvements of this size can also be expected when using the 2.5-state model with h(-1) (for Flicker Frequency Noise) from 10(-28) to 10(-30).
WOS关键词PRECISE ORBIT DETERMINATION ; LOW EARTH ORBITERS ; TIME
资助项目National Time Service Center, Chinese Academy of Sciences (CAS)[E167SC14] ; National Natural Science Foundation of China[12073034] ; CAS "Light of West China" Program[XAB2021YN25] ; Shaanxi Province Key Ramp;D Program Project[2022KW-29] ; Australian Research Council-discovery project[DP 190102444]
WOS研究方向Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology
语种英语
WOS记录号WOS:001018306600001
出版者MDPI
资助机构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 ; CAS "Light of West China" Program ; CAS "Light of West China" Program ; Shaanxi Province Key Ramp;D Program Project ; Shaanxi Province Key Ramp;D Program Project ; Australian Research Council-discovery project ; Australian Research Council-discovery project ; 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 ; CAS "Light of West China" Program ; CAS "Light of West China" Program ; Shaanxi Province Key Ramp;D Program Project ; Shaanxi Province Key Ramp;D Program Project ; Australian Research Council-discovery project ; Australian Research Council-discovery project ; 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 ; CAS "Light of West China" Program ; CAS "Light of West China" Program ; Shaanxi Province Key Ramp;D Program Project ; Shaanxi Province Key Ramp;D Program Project ; Australian Research Council-discovery project ; Australian Research Council-discovery project ; 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 ; CAS "Light of West China" Program ; CAS "Light of West China" Program ; Shaanxi Province Key Ramp;D Program Project ; Shaanxi Province Key Ramp;D Program Project ; Australian Research Council-discovery project ; Australian Research Council-discovery project
源URL[http://210.72.145.45/handle/361003/14205]  
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, Natl Time Serv Ctr, Xian 710600, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Kan,El-Mowafy, Ahmed,Yang, Xuhai. LEO Satellite Clock Modeling and Its Benefits for LEO Kinematic POD[J]. REMOTE SENSING,2023,15(12):22.
APA Wang, Kan,El-Mowafy, Ahmed,&Yang, Xuhai.(2023).LEO Satellite Clock Modeling and Its Benefits for LEO Kinematic POD.REMOTE SENSING,15(12),22.
MLA Wang, Kan,et al."LEO Satellite Clock Modeling and Its Benefits for LEO Kinematic POD".REMOTE SENSING 15.12(2023):22.

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来源：国家授时中心

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