Important Trait and Application of Time-frequency to Traceable Source Link

Taking the traceable source 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 quality 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.