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《Acta Electronica Sinica》 2017-08
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Concepts and Thoughts of Forming a GNSS Time Scale

WU Yi-wei;ZHU Xiang-wei;GONG Hang;SUN Guang-fu;OU Gang;School of Electronic Science and Technology,National University of Defense Technology;Beijing Satellite Navigation Center;  
The paper describes our thoughts of forming the system time of a Global Navigation Satellite System( GNSS),which is denoted by GNSST,and the time references TA( k) and UTC( k) of a timing laboratory where k characterizes the specific national laboratory. We also describe the roles of time scale algorithms,clock steering algorithms,and clock prediction algorithms in forming these time scales. We take Chinese Beidou satellite navigation system time( denoted BDT) as an example,and propose a twice steering algorithm to form BDT. We take the national time service center( NTSC) of China as an example to describe the idea,method,principle and theory of forming a TA( k) and a UTC( k). Then we analyze the impact of TA( NTSC) on UTC( NTSC),and the impact of UTC( NTSC) on the time synchronization precision and frequency stability performances of BDT if we steered BDT to UTC( NTSC). We also propose an idea of steering BDT to a paper time scale formed from UTC( NTSC) and UTC( BSNC). The performance is theoretically analyzed.
【Key Words】: GNSS timing laboratory time reference TA(k) UTC(k) time synchronization precision frequency stability
【CateGory Index】: TN967.1
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