摘要
面向地下大空间定位基站站间时间同步需求,本文研究了基于White Rabbit(WR)的光纤时频同步技术.针对传统双波双向WR上下行时延不对称系数往往难以准确标定问题,本文使用单波双向技术,实现WR信道免标定.另外,对于单波双向WR,主从节点即使使用相同的商用通讯光模块,光模块产生的信号光中心波长仍然存在不一致性.为此,本文理论分析光纤色散对WR时间同步的影响,给出了时间同步误差模型,并提出了时间同步误差缓解策略.以研制的WR工程样机在50 km光纤链路上进行实验验证,结果显示WR可以为地下大空间定位基站提供优于10^(2) ps的站间时频同步结果.
Aiming at the problem of time synchronization among underground large-space positioning base stations,the optical fiber time-frequency synchronization technology based on White Rabbit(WR)is studied.In view of the difficulty to calibrate the delay asymmetry coefficient of traditional two-wave bidirectional WR,the single-wave bidirectional WR is studied to solve the problem.For the single-wave bidirectional WR,even if the WR master and slave nodes use the same optical module,the central wavelength of the optical module is still not guaranteed to be exactly the same.Therefore,we analyze the fiber dispersion influence on WR time synchronization performance,and construct a time synchronization error model.In addition,a corresponding mitigation strategy is given.Using the self-developed WR engineering prototypes,the experimental verifications are performed in 50 km fiber link.The results show that the single-wave bidirection WR can offer time synchronization accuracy better than 10^(2) ps for the underground large-space positioning base stations.
作者
张旭论
张京奎
蔚保国
盛传贞
易卿武
邓志鑫
ZHANG Xulun;ZHANG Jingkui;YU Baoguo;SHENG Chuanzhen;YI Qingwu;DENG Zhixin(The 54th Research Institute of CETC,Shijiazhuang 050081,China;State Key Laboratory of Satellite Navigation System and Equipment Technology,Shijiazhuang 050081,China)
出处
《全球定位系统》
2025年第3期8-13,共6页
Gnss World of China
基金
国家重点研发计划(2021YFB3900700)。
关键词
时频同步
地下大空间
单波双向
光纤光学
定位导航
time and frequency synchronization
large underground space
single-wavelength bi-direction
fiber optics
positioning and navigation
