Abstract: The standard time-frequency system is an important strategic infrastructure of the country, and it plays a fundamental role in safeguarding the national economy and national security. Time-frequency data is one of the important national information resources. The national time and frequency system dataset includes TAI (International Atomic Time), UTC(NTSC) (Coordinate Universal Time maintained by National Time Service Center of Chinese Academy of Sciences), atomic clock weights, atomic clock rates, the electronic version of the Time and Frequency Bulletin released by NTSC and the Earth Rotation Bulletins A, B, C, and D published by the International Earth Rotation Service (IERS), etc. This paper introduces the calculation and generation process of atomic clock weight dataset and rate dataset, the data acquisition process and data structure of time-frequency bulletin and earth rotation bulletins, the data quality control analysis, the validity of the dataset, etc. It also introduces the application of the dataset from the aspects of atomic clock performance evaluation, atomic time scale calculation, and time-keeping system evaluation, etc. The current dataset contains data from 2018 to 2019. The data quality is controlled through time-frequency scientific data processing procedures. In the future, with the continuous improvement of dataset resources, national time-frequency system dataset can provide more abundant and accurate basic scientific data for time-frequency scientific research and national standard time-frequency users.
Keywords: time-frequency system; atomic clock weight; atomic clock rate; time-frequency dataset; earth rotation bulletins; data quality