基于自动校准的WSNs时间同步算法

摘要

针对无线传感器网络(WSNs)中时钟偏移问题,提出了一种基于自动校准的时间同步算法,采用修改的延迟测量时间同步(DMTS)算法,子节点将其本地时间同步到汇聚节点,并且在保证同步精度的前提下,结合一种极低复杂度的时间自动校准机制,子节点动态校准自己的时钟计数.相比无校准的同步算法,可以大幅度地降低节点间时间同步的频率,从而有效地降低传感器节点的能耗和其他开销.%Aiming at issue of clock skew in wireless sensor networks,a time synchronization algorithm based on self-calibration method is presented.Using modified delay measurement time synchronization (DMTS) algorithm,the time of the child nodes can be synchronized to the sink node.And on the premise of ensuring synchronization precision,combines a very low complexity time self-calibration scheme,the child nodes calibrate their clock counts dynamically.Compared with the synchronization algorithm of no calibration,it can greatly reduce the frequency of time synchronization and effectively reduce energy consumption and other overhead of sensor nodes.