Research on Distributed Ensemble Time Scale for Railway Time Synchronization Network

LIANG Kun; WEI Baoying

doi:10.11999/JEIT230806

Volume 45 Issue 11

Nov. 2023

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Article Navigation > Journal of Electronics & Information Technology > 2023 > 45(11): 4127-4136

LIANG Kun, WEI Baoying. Research on Distributed Ensemble Time Scale for Railway Time Synchronization Network[J]. Journal of Electronics & Information Technology, 2023, 45(11): 4127-4136. doi: 10.11999/JEIT230806

Citation:

LIANG Kun, WEI Baoying. Research on Distributed Ensemble Time Scale for Railway Time Synchronization Network[J]. Journal of Electronics & Information Technology, 2023, 45(11): 4127-4136. doi: 10.11999/JEIT230806

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Research on Distributed Ensemble Time Scale for Railway Time Synchronization Network

doi: 10.11999/JEIT230806 cstr: 32379.14.JEIT230806

LIANG Kun^,,
WEI Baoying

School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China

Funds: The National Key R&D Program of China (2021YFB3900704), The Open Foundation of National Railway Intelligence Transportation System Engineering Technology Research Center

Received Date: 2023-08-01
Rev Recd Date: 2023-10-24

Available Online: 2023-10-30

Publish Date: 2023-11-28

Abstract

Abstract

The railway time synchronization network provides the standard time quantity value for various railway systems. The accuracy and stability of the time quantity value have an important impact on the safe and the efficient operation of the railway systems. There are three potential problems with the current railway time synchronization network. The traceability references of each time node are inconsistent, and the time of each node is not accurately traced to Coordinated Universal Time (UTC). Only one primary time node is set. The secondary and the tertiary time nodes are greatly affected by the failure of the primary time node, and lack of robustness. Monitoring methods are only used a single time node. There is no automatic monitoring method at the overall level. In view of the above potential problems, the distributed Ensemble Time scale (TE) for railway time synchronization network that can accurately trace to UTC is proposed. A simulation model of railway time synchronization network is established, and a TE algorithm is designed. TE is generated by 19 atomic clocks from the primary and the secondary time nodes. The results show that the time differences between TE and UTC can be better than 30 ns. The uncertainty of TE-UTC is better than 5 ns. When the primary time node works normally, the time stability of the secondary time node can be improved about 40% by introducing TE. When the primary time node fails, TE can be continuously generated and used as a unified traceability reference. The frequency and time stability of the secondary time node under the TE synchronization architecture is about 35% higher than that under the traditional synchronization architecture. The time differences between any time nodes can be obtained based on TE. By analyzing the time differences data, automatic monitoring of all time nodes and the continuity of Precision Time Protocol (PTP) links at the overall level can be realized.
- Railway time synchronization network,
- Distributed Ensemble Time scale (TE),
- Robustness,
- Traceability,
- Monitoring

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References(20)

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