百皮秒级不确定度的时间传递方法研究

项目名称： 百皮秒级不确定度的时间传递方法研究

项目编号： No.11303024

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 梁坤

作者单位： 中国计量科学研究院

项目金额： 28万元

中文摘要： 频率基标准和时间尺度（时标）的准确度和稳定度越来越高，且通常分布在不同地点，为验证它们不断提高的性能指标，须开发比GNSS时间频率传递和卫星双向时间频率传递更低不确定度的远程时间频率传递方法。基于更优良传播介质光纤的通信网络发展迅速，使得利用光纤进行更低不确定度的时频传递更具可能和吸引力。国外对光纤时频传递的研究开展较早，绝大部分集中在频率传递方面；时间传递方面研究较少，国际上尚无任何两家时间实验室时标之间的正式发表的比对结果。国内此方面的研究起步较晚，尚处于实验室试验阶段，无时间传递链路校准和不确定度评定方法的研究。基于扩频伪码调制解调技术及相关理论和码分多址技术，使用光纤替代空间及卫星作为传播介质，研究单双向时频传递，探索光纤时间传递链路校准方法，进而在实际的光纤链路中实现百皮秒级不确定度的光纤时间传递，同时得到高精度的频率传递结果，最终为未来我国光纤时间频率传递网建设积累技术基础。

中文关键词： 时间频率传递；光纤；双向；单向；

英文摘要： The accuracy and stability of the frequency standards and the time scales that are generally located on different sites is much higher and higher, and the transfer method with lower uncertainty than GNSS time and frequency transfer and two way satellite time and frequency transfer should be developed for verification of their performances.Since the communication networks based on optical fiber that is better transmission medium were developed quickly, time and frequency transfer through optical fiber with lower uncertainty has been more and more feasible and attractive. Studies on optical fiber time and frequency abroad have been started earlier and most of them have been focused on frequency transfer. Studies on time transfer are fewer, and there hasn't been international comparison results published formally between two time scales of national timing lab.Domestic researches have been initiated much more lately, and there has been some test results using the optical fibers inside the labs, and there hasn't been any studies on calibration of time transfer link and evaluation of transfer uncertainty. Based on the theories and technology of spread spectrum, modulation-demodulation,correlation and code division multiple access(CDMA), using optical fiber as the transmission medium instead of space and satellites, si

英文关键词： time and frequency transfer；optical fiber；two way；one way；