Real-Time LEO Satellite Clocks Based on Near-Real-Time Clock Determination with Ultra-Short-Term Prediction

doi:10.3390/rs16081326

	Real-Time LEO Satellite Clocks Based on Near-Real-Time Clock Determination with Ultra-Short-Term Prediction
	Wu, Meifang 1,2,3; Wang, Kan 1,2,3; Wang, Jinqian 1,2,3; Liu, Jiawei 1,3; Chen, Beixi 1,2,3; Xie, Wei 1,3; Zhang, Zhe 1,2,3; Yang, Xuhai 1,2,3
	2024-04-01
发表期刊	REMOTE SENSING
卷号	16 期号:8 页码:17
摘要	The utilization of Low Earth Orbit (LEO) satellites is anticipated to augment various aspects of traditional GNSS-based Positioning, Navigation, and Timing (PNT) services. While the LEO satellite orbital products can nowadays be produced with rather high accuracy in real-time of a few centimeters, the precision of the LEO satellite clock products that can be achieved in real-time is less studied. The latter, however, plays an essential role in the LEO-augmented positioning and timing performances. In real-time, the users eventually use the predicted LEO satellite clocks, with their precision determined by both the near-real-time clock precision and the prediction time needed to match the time window for real-time applications, i.e., the precision loss during the prediction phase. In this study, a real-time LEO satellite clock determination method, consisting of near-real-time clock determination with ultra-short-term clock prediction is proposed and implemented. The principles and strategies of this method are discussed in detail. The proposed method utilized Kalman-filter-based processing, but supports restarts at pre-defined times, thus hampering continuous bias propagation and accumulation from ancient epochs. Based on the method, using Sentinel-3B GNSS observations and the real-time GNSS products from the National Center for Space Studies (CNES) in France, the near-real-time LEO satellite clocks can reach a precision of 0.2 to 0.3 ns, and the precision loss during the prediction phase is within 0.07 ns for a prediction time window from 30 to 90 s. This results in a total error budget in the real-time LEO satellite clocks of about 0.3 ns.
关键词	LEO real-time satellite clock clock determination clock prediction
资助者	National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China
DOI	10.3390/rs16081326
关键词[WOS]	NAVIGATION
语种	英语
资助项目	National Science Foundation of China
资助者	National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
WOS记录号	WOS:001210070800001
出版者	MDPI
引用统计
文献类型	期刊论文
条目标识符	http://210.72.145.45/handle/361003/14661
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.Univ Chinese Acad Sci, Beijing 100094, Peoples R China 3.Chinese Acad Sci, Key Lab Time Reference & Applicat, Xian 710600, Peoples R China
推荐引用方式 GB/T 7714	Wu, Meifang,Wang, Kan,Wang, Jinqian,et al. Real-Time LEO Satellite Clocks Based on Near-Real-Time Clock Determination with Ultra-Short-Term Prediction[J]. REMOTE SENSING,2024,16(8):17.
APA	Wu, Meifang.,Wang, Kan.,Wang, Jinqian.,Liu, Jiawei.,Chen, Beixi.,...&Yang, Xuhai.(2024).Real-Time LEO Satellite Clocks Based on Near-Real-Time Clock Determination with Ultra-Short-Term Prediction.REMOTE SENSING,16(8),17.
MLA	Wu, Meifang,et al."Real-Time LEO Satellite Clocks Based on Near-Real-Time Clock Determination with Ultra-Short-Term Prediction".REMOTE SENSING 16.8(2024):17.