摘要
为了实现风电场SCADA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准确获取网络数据帧离开和到达时刻的时间同步方法,通过对各从节点相对主节点的频率偏差修正、往返法测量链路时延以及实时计算交换时延补偿交换时延的不确定性,实现了主节点到从节点的高精度时间同步。试验证明,基于介质无关接口的开环时间传递能够实现25ns的高精度时钟同步。
In order to realize clock synchronization in distribute SCADA system, the method for clock synchronization in distribute network is presented, which based on MII （Medium Indepent Interface） of physical layer. The process of clock synchronization between master clock and slave clock is analyzed detailed. To accurately gain arrived and left time on MII, the correction of rate drift between master clock and salve clocks is realized, and circuitry transmit delay is measured, the uncertain time delay of Ethernet switcher is measured in real-time. The experiment results indicate that the method based on MII can realize clock synchronization between master anti slave within 25 ns.
出处
《微计算机信息》
2009年第22期46-48,共3页
Control & Automation
