Development of a Standard Time Recurring Terminal Based on GNSS Satellite Common-view
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1. National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China; 2. The 34th Research Institute of China Electronics Technology Group Corporation, GuiLin 541000, China;3. Graduate University of Chinese Academy of Sciences, Beijing 100190, China

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TH76 TP873

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    Abstract:

    This paper develops a standard time reproduction terminal based on GNSS satellite common-view. The technology used by the terminal has improved the traditional satellite common-view, so that the common-view period can be flexibly configured according to the type of clock source used by the users, and is not limited 16 minutes in the traditional common view.In addition, a set of remote reproduction system is built using this technology. The system is composed of a reference station and a user station. A standard time reproduction terminal is placed in both places. The terminal is mainly composed of a satellite card, a time interval counter, and a clock source. Features such as small size, low cost and flexible composition. By using the common view comparison result of the base station and the user station to adjust the clock source output signal of the user station, the time and frequency signal synchronized with the base station can be reproduced locally in the user in real time, and the absolute deviation of synchronization can be kept within 10ns (95%). For users, there is no need to deeply understand the implementation principle, only a reproduction terminal is needed to obtain a time-frequency signal synchronized with the time of the reference station with high precision, thus meeting the needs of users in all walks of life for time-frequency signals . According to the test experiment, it is concluded that the time-frequency signal of the dual-frequency version of the reproduction terminal has a maximum deviation of 7.19ns from the national standard time UTC (NTSC) frequency signal, the standard deviation is 1.49ns, and the frequency accuracy is 4.25e-14; The maximum deviation between the time-frequency signal recovered in the remote location of the single-frequency version of the terminal and the national standard time UTC (NTSC) frequency signal is 10.9ns, the standard deviation is 4.23ns, and the frequency accuracy is 3.79e-14.

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  • Received:
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  • Online: October 18,2024
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