Satellite Clock Offset Determination and Prediction with Integrating Regional Satellite-Ground and Inter-Satellite Data
Time synchronization between Satellites is the foundation for satellite navigation system, which is realized by satellite-ground clock offset determination and prediction. Therefore, satellite clock offset determination and prediction is a key technique f
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Satellite Clock Offset Determination and Prediction with Integrating Regional Satellite-Ground and Inter-Satellite Data Li Liu, Xin Shi, Guifen Tang, Lan Du, Lingfeng Zhu and Rui Guo
Abstract Time synchronization between Satellites is the foundation for satellite navigation system, which is realized by satellite-ground clock offset determination and prediction. Therefore, satellite clock offset determination and prediction is a key technique for satellite navigation systems. At present, precise time synchronization between satellites by inter-satellite link and auto-time synchronization is considered to be important development direction for navigation domain. A satellite clock offset determination and prediction method by integrating regional satellite-ground observation data and inter-satellite observation data is discussed. We first introduce some common used methods for satellite clock determination, and then discuss the principle and data process model for satellite clock determination based on inter-satellite link dada. We provide the method of Helmert variance components estimation to determine and predict satellite clock based on integrating satellite-ground and inter-satellite observation data. At last, we analyse the performance for our method by using real observation data and simulation data, the result shows the method overcomes the defects of regional monitoring network and improves the precise of prediction form 8 to 1.5 ns for MEO satellite when the satellites can’t been observed. The method also increases the satellite clock data when the satellites can be observed, which can improved the precise and reliability for determination and prediction satellite clock offset.
Keywords Navigation satellite Time synchronization Clock offset determination Clock offset prediction
Inter-satellite link
L. Liu (&) X. Shi G. Tang L. Zhu R. Guo Beijing Satellite Navigation Center, Beijing 100094, China e-mail: [email protected] L. Du Information Engineering University, Zhengzhou 450052, China
J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2014 Proceedings: Volume III, Lecture Notes in Electrical Engineering 305, DOI: 10.1007/978-3-642-54740-9_37, Springer-Verlag Berlin Heidelberg 2014
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37.1 Introduction The distance between satellite and user is the base observation value for the satellite navigation user, which is obtained by measuring the transmission delay. So satellite navigation system should have a high precise time scale in order to realize the high precise navigation and positioning [1]. The high precise time scale that the satellite navigation system provides to the user is realized by the accuracy time of the navigation satellite. In order to make the time which is broadcast by the satellite deputize for the ground time scale, the satellite clock should be synchronized by the ground time scale termly or periodically. Thus, the difference between the satellite time and ground time can be maintained in a stated bias scope. Synchronizatio
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