中文摘要：

主要以关国国家技术标准研究院（NIST）的时间频率溯源链系统为典型，给出其方框图和技术指标，并述评了NIST的宗旨、任务，及时间频率溯源链的重要特征是：拥有高精度的铯喷泉原始频率基准（准确度、稳定度均-1·10^-15）；在时间频率传递方法和技术研究开发方面处于领先地位；在远程校准的频率测量和分析系统（FMAS），及溯源链系统的尖端装备的高集成化、自动化、智能化、轻量化品质方面均达到先进水平。并综述了高精度的时间频率同步系统在天文学测量、导弹发射、导航、定位等科学实验研究领域中的重要作用和目前达到的关键技术指标。

英文摘要：

Taking the traceable som-ce link system of the time- frequency as the typical one from the National Intelligence Standard Research Institute （NIST） of the United States, the article provides its block - diagram and technical indicators, reviews its aim and its task. The article also gives the important characters of the traceable source link of the time-frequency, which includes： having the high - accuracy cesium fountain primitive frequency benchmark （accuracy and steady degrees all reach to 1＂ E-15）, keeping ahead in the aspect of time - frequency transform method technology research and development, then reaching the advanced level in the frequency measurement and the analytical system of long - range calibration （FMAS）, so as in the cplality of the high integration, automatization, intelligent, lightweight of top- level equipment in the traceable source link system. At last, the article describes the importance and the key technical indicator achieved at present to the high- accuracy synchronous time- frequency system in the field of the astronomy measurement, the guided missile launch, navigation and orientation, etc.