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Fig. 1 Researchers at the Chinese Metrology Institute install and debug the NIMDO traceable device at a remote station in Guizhou
To this end, China Metrology Institute, based on the “Research on Remote Time Traceability System†of AQSIQ's value transmission project, systematically studied the Global Time Navigation Satellite System (GNSS) remote time frequency transmission technology and time transfer link calibration technology, and successfully developed It has an internationally advanced level of high accuracy remote time traceability system. The system takes the self-developed high-precision time-frequency standard device (NIMDO) as the core, realizing the user's time frequency “tamed†with the national atomic time scale measurement reference UTC (NIM) in real time, which fundamentally guarantees the accuracy of the user's time and frequency. , traceability and stability requirements. On this basis, China Metrology Institute established remote pilot stations in three provincial metrology institutes in Heilongjiang, Xinjiang, and Guizhou, installed remote time frequency calibration and time standard devices, and implemented UTC (NIM) and The real-time comparison between the time frequency values ​​of each pilot station has achieved good application results.
Figure 2 NIMDO-based Guizhou Application Center Time Frequency Standard System
It is understood that the “National Time Frequency Measurement Center Guizhou Application Centerâ€, which was jointly established by the China Metrology Institute and the Guizhou Provincial Quality Supervision Bureau and relied on the Guizhou Provincial Measurement and Testing Institute, has adopted a remote time-tracking system developed by the China Institute of Metrology and has achieved National time standard reference UTC (NIM) real-time synchronization, time deviation does not exceed ± 20ns, and has a high accuracy of the time frequency remote calibration and network timing capabilities to meet Guizhou and southwestern China high-end equipment manufacturing, smart grid, Road traffic and other units trace the need for high accuracy time and frequency values. In the future, the center will also establish helium-atomic frequency standards and atomic time-scale standards, and conduct research on the application of high-precision time-frequency mass transfer systems for high-speed railways, Beidou satellite navigation applications, big data transmission, smart grids, and high-end equipment manufacturing. Accurate, safe and traceable time and frequency technical services.
(Original title: China Institute of Metrology Realizes Time-Frequency Accuracy Remote Calibration and Traceability Applications)
[China Instrument Network Instrument Development] Time-frequency transmission system is an important part of time and frequency services. It is a bridge linking China's time frequency reference to all levels of standards and users of time and frequency, and it is also a way to achieve "flattening of time and frequency measurement values." "The key factor. In the transmission process, the traceability, security, and stability of the guaranteed time frequency are particularly important for users in the fields of high-end equipment manufacturing, aerospace and other fields. The scheme for tracing back to GPS time using one-way GPS timing technology has been difficult to satisfy the relevant users. The request.