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A step to the decentralized real-time timekeeping network |
| Fangmin Wang(王芳敏)1,2, Yufeng Chen(陈雨锋)1,2, Jianhua Zhou(周建华)3, Yuting Lin(蔺玉亭)3, Jun Yang(杨军)4, Bo Wang(王波)1,2,†, and Lijun Wang(王力军)1,2 |
1 State Key Laboratory of Precision Space-time Information Sensing Technology, Department of Precision Instrument, Tsinghua University, Beijing 100084, China;
2 Key Laboratory of Photonic Control Technology(Ministry of Education), Tsinghua University, Beijing 100084, China;
3 Beijing Satellite Navigation Center, Beijing 100094, China;
4 Beijing Institute of Radio Metrology and Measurement, Beijing 100854, China |
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Abstract The composite time scale (CTS) provides an accurate and stable time-frequency reference for modern science and technology. Conventional CTS always features a centralized network topology, which means that the CTS is accompanied by a local master clock. This largely restricts the stability and reliability of the CTS. We simulate the restriction and analyze the influence of the master clock on the CTS. It proves that the CTS's long-term stability is also positively related to that of the master clock, until the region dominated by the frequency drift of the H-maser (averaging time longer than ～105 s). Aiming at this restriction, a real-time clock network is utilized. Based on the network, a real-time CTS referenced by a stable remote master clock is achieved. The experiment comparing two real-time CTSs referenced by a local and a remote master clock respectively reveals that under open-loop steering, the stability of the CTS is improved by referencing to a remote and more stable master clock instead of a local and less stable master clock. In this way, with the help of the proposed scheme, the CTS can be referenced to the most stable master clock within the network in real time, no matter whether it is local or remote, making democratic polycentric timekeeping possible.
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Received: 19 July 2023
Revised: 08 September 2023
Accepted manuscript online: 18 September 2023
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PACS:
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06.30.Ft
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(Time and frequency)
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06.20.-f
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(Metrology)
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| Fund: This work was supported in part by the National Natural Science Foundation of China (Grant No. 61971259), the National Key R&D Program of China (Grant No. 2021YFA1402102), and Tsinghua University Initiative Scientific Research Program. |
Corresponding Authors:
Bo Wang
E-mail: bo.wang@tsinghua.edu.cn
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Cite this article:
Fangmin Wang(王芳敏), Yufeng Chen(陈雨锋), Jianhua Zhou(周建华), Yuting Lin(蔺玉亭), Jun Yang(杨军), Bo Wang(王波), and Lijun Wang(王力军) A step to the decentralized real-time timekeeping network 2024 Chin. Phys. B 33 010702
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