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

文献类型：期刊论文

作者Wu, Meifang1,2,3; Wang, Kan1,2,3; Wang, Jinqian1,2,3; Liu, Jiawei1,3; Chen, Beixi1,2,3; Xie, Wei1,3; Zhang, Zhe1,2,3; Yang, Xuhai1,2,3
刊名REMOTE SENSING
出版日期2024-04-01
卷号16期号:8页码:17
关键词LEO real-time satellite clock clock determination clock prediction
DOI10.3390/rs16081326
英文摘要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.
WOS关键词NAVIGATION
资助项目National Science Foundation of China
WOS研究方向Environmental Sciences & Ecology ; Geology ; Remote Sensing ; Imaging Science & Photographic Technology
语种英语
WOS记录号WOS:001210070800001
出版者MDPI
资助机构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
源URL[http://210.72.145.45/handle/361003/14661]  
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.Chinese Acad Sci, Key Lab Time Reference & Applicat, Xian 710600, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100094, 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		 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.

入库方式： OAI收割

来源：国家授时中心

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