Abstract
To solve the problem of remote transmission of legal time measurements and fill the gap of traceable time standards and time-measuring instruments, the remote time traceability method was studied, and the remote time traceability device NIMDO was developed by disciplining rubidium, cesium, and hydrogen atomic clocks with reference to the atomic time national primary standard (UTC(NIM)) and using the GNSS time and frequency transfer method, and a remote time traceability system was preliminarily constructed based on the device. Through various experimental verifications, the device achieves a high-performance time scale at the remote end and synchronizes with UTC(NIM) in real-time, which is equivalent to reproducing UTC(NIM) at the remote end with a certain time and frequency deviations, and the time deviation of NIMDO from UTC(NIM) is better than ±10 ns and frequency deviation is better than ±1×10−13 in over 90% of the time, and the time deviation stays within ±5 ns in more than 87% of the cases.
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