分布式网络时钟同步研究

为了实现分布式测控系统的时钟同步,提出了基于物理层物理介质无关接口的时钟同步方法。详细分析了分布式网络主从节点间实现时间同步的过程,提出了基于介质无关接口的时间服务单元的设计。在时间服务单元准确获取网络数据帧离开和到达时刻的基础上,实现了各从节点相对主节点的频率偏差修正,通过往返法测量链路时延,通过实时计算交换时延补偿交换时延的不确定性,从而实现了主节点到从节点的高精度时间同步。针对分步式网络的特点,在时间同步的基础上提出了基于时间信息的同步触发方法。试验证明,基于介质无关接口的开环时间传递能够实现25 ns的高精度时钟同步。

Research of c1ock synchronization in distributed network

In order to realize clock synchronization in distributed test system,a method for clock synchronization in distributed network is presented,which is based on MII(Medium Independent Interface)of physical layer.The process of clock synchronization between master clock and slave clock is analyzed in detail,and the TSU(time serv- ice unit)based on MII is put forward.By using TSU to accurately obtain the arrival and leaving time,the frequency offset correction between master clock and salve clocks is realized;an...