|The Beijing Institute of Radio Metrology and Measurements (BIRMM), as a calibration center and a research division of radio metrology and measurements and frequency control devices for the system of space technology in China, has made some progress in PTTI research work in recent years. This paper will review some of PTTI activities briefly. Frequency measurement is one of the routine jobs of BIRMM. Now there have been three kinds of frequency measuring systems: a system of frequency comparison, a system of phase comparison and a system of time comparison. In cooperation with other organizations from 1978 to the second quarter of 1979, two experiments on time synchronization were carried out. With the help of the portable cesium clock in determining the time delay between two stations, one experiment of time synchronization, chiefly sponsored by the Central Bureau of Metrology, of China, between Nanjing (China) and Raisting (West Germany) by using the "Symphony" satellite, has achieved a result with an accuracy of 30 ns and an uncertainty of about 10 ns. The other experiment, applying the television pulse technique for time synchronization, has yielded a result with an error of about 0.5 us in 24 hours.
Proceedings of the 11th Annual Precise Time and Time Interval Systems and Applications Meeting
November 27 - 29, 1979
Goddard Space Flight Center
|657 - 683
|Cite this article:
|Wang, H.T., "The Frequency and Time Standard and Activities at the Beijing Institute of Radio Metrology and Measurements," Proceedings of the 11th Annual Precise Time and Time Interval Systems and Applications Meeting, Greenbelt, Maryland, November 1979, pp. 657-683.
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