Research of Satellite and Ground Time Synchronization Based on a New Navigation System
The new navigation time synchronization method is a breakthrough in existing navigation systems time synchronization accuracy limit, and it is an effective way to reduce system construction costs. By placing more accurate atomic clock in GEO satellites, i
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Abstract The new navigation time synchronization method is a breakthrough in existing navigation systems time synchronization accuracy limit, and it is an effective way to reduce system construction costs. By placing more accurate atomic clock in GEO satellites, it can synchronize with ground systems and generate time reference, the GEO satellites can give time to other navigation satellites, the new system can achieve high-precision time synchronization. This paper designs the navigation constellation of the new satellite navigation system, and configures the satellite clocks, simulates all kinds of constellation time synchronization precision, and educes the satellite clock configure scheme in the new navigation system. Keywords Navigation system
Time synchronization Satellite clock
1 Introduction Satellite navigation systems have been widely used in military and civilian aspects of various countries and have achieved great benefits. But still there are various disadvantages in navigation system, as the number of existing satellite onboard atomic clocks demands more and high costs [1, 2]. Therefore, the use of new atomic clock design, to explore new satellite clock configuration is an effective way to reduce system construction costs. The new time synchronization method is essentially a kind of satellite-ground, inter-satellite system operation control concept: it contains GEO satellites constellation and high accurate atomic clock; its time reference is generated by the GEO satellites and the system Control Segment Operational; it mainly relies on the OCS to do the centralized satellite-ground and inter-satellite measurement Y. Yang (&) Y. Yang Beijing Satellite Navigation Centre, Beijing, China e-mail: [email protected] K. Zheng Y. Jia Beijing Institute of Special Electromechanical Technology, Beijing, China © Springer Science+Business Media Singapore 2016 J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2016 Proceedings: Volume III, Lecture Notes in Electrical Engineering 390, DOI 10.1007/978-981-10-0940-2_2
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processing; it depends on the inter-satellite link to update the ephemeris, and to shorten the data age. So, non-GEO satellite of the navigation constellation can use reasonable algorithm, high-precision satellite-ground and inter-satellite link, and the configuration of the ultra-stable crystal oscillator, to achieve a high precision with low construction cost.
2 The New Time Synchronization Plan Under the new system time synchronization plan involved basic navigation constellations and star clock design, the link design, and time synchronization plan. This system needs GEO satellite to provide time service, so the constellation must contain GEO satellites. For new time synchronization system, GEO satellites use more accurate onboard atomic clock which builds a time reference together with the OCS clock [3]. This paper takes two types of optical clocks and hydrogen atomic clock as a time reference installed on the GEO satellite, and non-GEO satellites use o
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