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    • 基于UWB的无线网络精密时钟同步设计

    Qu Zhi, Zhang Huiqing,Chen Jianyun

    Foreign Electronic Measurement Technology（2023）

    中国人民解放军国防科技大学

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    Abstract
    针对无线集群网络对低代价精密时钟同步的需求,设计了基于恒温晶振(oven controlled crystal oscillator,OCXO)和超宽带(ultra wide band,UWB)的无线网络亚纳秒级时钟同步系统.系统能够测量与矫正UWB模块与OCXO模块之间的相位偏移,将UWB模块的时间基准精确地溯源到OCXO,降低了系统时钟相位的不确定性.同时,构建了低尺寸、重量、功耗和成本(size,weight,power and cost,SWaP-C)时钟的高阶模型,设计了动态双单向测量机制与基于Kalman滤波器的动态时频估计方法,从而减小了时钟频率偏差和漂移等动态特性对同步的影响,实现亚纳秒级的无线网络时钟同步.实验表明,系统时频同步方法收敛迅速,同步精度优于 0.15 ns.
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    Key words
    precision clock synchronization,UWB,high order clock model,dynamic time-frequency estimation
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