摘要
时间同步是无线传感网的一项重要支撑技术。针对无线传感网桥梁结构健康监测系统的结构特点,将整个系统的时间同步操作分为有线和无线两部分。对于有线部分,采用周期性的双向同步操作达到与时间服务器的时间同步。对于无线部分,在比较分析已有无线传感网时间同步算法基础上,提出一种适用于桥梁结构健康监测系统的绝对时间同步方案,此方案考虑节点线性时钟模型,结合节点间单向广播同步和双向同步方式,并在双向同步中采用邻近节点间广播方式减少同步操作次数,同步结果具有较好的稳定性和较低的通信开销。
Time Synchronization is an important middleware of wireless sensor networks （WSN）. Time synchronization of WSN for bridge structural health monitoring system is divided into two parts of wired and wireless based on the system architecture. As to the wired part, periodic pair-wise synchronization operation is adopted to get base station synchronized with the time server. As to the wireless part,a time synchronization scheme combining sender-receiver and pair-wise synchronization modes is proposed on the basis of comparing existing time synchronization protocols in WSN. The scheme acknowledges the linear relationship between node time and the resolute time. Broadcast transmission mode is used in pair-wise synchronization phase to reduce the number of synchronization operations. This time synchronization algorithm can adapt sensor node＇s time to world time with good synchronization stability and low communication overhead.
出处
《电子测量技术》
2013年第1期120-123,共4页
Electronic Measurement Technology
关键词
结构健康监测
无线传感网
时间同步
线性回归
structural health monitoring,wireless sensor network
time synchronization
linear regression
