时间和频率技术新进展

Recent Progress in Time and Frequency

概述了最近几年时间和频率技术的最新进展．给出了各种实用的原子频率标准的最新发展以及它们的性能指标的最新结果．介绍了国际原子时的归算方法和所达到的新水平，并对各种原子钟在归算中的应用概况和所起的作用进行了比较，强调了氢原子钟的特殊作用和地位．同时也综述了高精度的时间同步和时频计量新技术的进展，特别是对为提高GPS这一国际时间同步新技术的应用水平进行的各种实验研究工作的最新进展进行了描述．对目前国际上正在进行和计划中的一些重要的时频活动也进行了介绍．

This paper describes the recent progress of time and frequency techniques, the recent development of various applied atomic frequency standards as well as their new performance results.The algorithm of international Atomic Time (TAI) and its reached new level, along with theapplications and roles of various atomic clocks in the TAI computation are presented, in whichthe outstanding position and role of hydrogen masers have been emphasized. Meanwhile, italso reviews the recent progress in high precision time synchronization techniques and time &frequency measurement techniques, especially that in experimental research for improving application of GPS and GLONASS time synchronization techniques. In addition, some importanttime & frequency activities under way and projected in the world are also introduced.