Recent Progress of the Research Works on Frequency and Time at the NIM

Huang Bingying

Abstract:	Research works on frequency and time have been engaged for many years at the NIM. We do the research and development on the primary cesium beam standard and the high-precision crystal oscillator, keep the atomic time and calibrate frequency standards. We also study how to transfer the standard frequency and time at the highest precision. Now, our primary cesium beam installation has been operated to give an accuracy of 1.2 . 10-12 (10). Basing on it, some improvements are being made to attain an uncertainty goal of the order of 10-13. Furthermore, two important experiments have been done in the last two years. One of them was the standard frequency transfer via TV color subcarrier. The frequency stability of Ox (30 min.) = 4 . 10-12 has been obtained. Another test was the time synchronization via the Germany-French "Symphonie" satellite. The best results are as follows: the random fluctuation of direct measurement data is loR (RMS) < 10 ns, and the absolute error of clock synchronization is 10A (RMS) < 30 ns.
Published in:	Proceedings of the 11th Annual Precise Time and Time Interval Systems and Applications Meeting November 27 - 29, 1979 Goddard Space Flight Center Greenbelt, Maryland
Pages:	685 - 688
Cite this article:	Bingying, Huang, "Recent Progress of the Research Works on Frequency and Time at the NIM," Proceedings of the 11th Annual Precise Time and Time Interval Systems and Applications Meeting, Greenbelt, Maryland, November 1979, pp. 685-688.
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