Construction of NIMDO-Based Time and Frequency Measurement Standard

Traditional time and frequency measurement standards are mostly provided by rubidium atomic frequency standards or high stability crystal oscillators, and rubidium atomic frequency standards need to be periodically traced to higher-level measurement standards, which has a long calibration period, and the instruments are easily damaged during the process of sending them for inspection. The proposed remote time and frequency traceability system with the time and frequency standard device (NIMDO) as the core realizes real-time time and frequency traceability to the atomic time scale national primary standard UTC (NIM) and uses NIMDO as the reference frequency source to build many measurement standards in the time and frequency field, forming a three-level traceability system from the national primary standard to the measuring instruments.