守时工作进展

随着近5年时间传递技术(多通道GPS／GLONASS CV、TWSTFT、GPS P3 CV)和原子时算法的发展，国际原子时TAI和各国的守时工作有了较大的进展，中国科学院国家授时中心(NTSC)和国内其他时间实验室的工作也不例外。介绍国际权度局(BIPM)时间部有关2000～2003年TAI的研究进展，以及NTSC和国际、国内某些时间实验室守时工作简况。另外，自2000年以来国际上对UTC之未来的争论很激烈，因此就2003年5月28～30日在意大利都灵市举行的“UTC的未来”研讨会的情况也作一些介绍，以便国内天体测量相关学术领域的同行们对这些发展有一个基本的了解。

The Progress on Time Keeping

Along with the development on time transfer techniques and the improvement of the algorithm, ALGOS, for the TAI computation and local atomic time scale, the accuracy and stability of the TAI and the accuracy of UTC(k) synchronizing to UTC have been made big progress. The development on the ALGOS, the means for the TAI time links and the primary frequency standards used for estimating the relative departure and, its uncertainty, of the TAI scale from the SI second, are described here. The Future Definition of UTC Timescale has been discussed since the year 2000 and the viewpoints presented by experts in different fields are introduced in this paper. The work on time keeping at NTSC and a few time labs in the world during the past 3 years are displayed.