论文部分内容阅读
在无线传感器网络(WSN)中,时间同步是测距定位的前提条件,直接影响着测距的精度。以变电站室内操作人员定位为特殊应用背景,研究具有微秒级同步精度、低功耗的时间同步方法。通过对RBS、TPSN、DMTS及FTSP等各种典型时间同步算法的比较,提出一种针对参考节点和目标节点采用不同时间同步算法,基站与目标节点采用双向通信,参考节点采用侦听方式来实现时间同步。在保证全网的高时间同步精度的同时,也大大降低了传感节点的能耗。实物测试结果表明,所提方法与经典同步方法RBS具有相同的时间同步精度,并且大幅降低了同步开销,可以满足仅携带少量有限能量传感节点的需求。
In Wireless Sensor Network (WSN), time synchronization is the prerequisite of ranging and positioning, which directly affects the accuracy of ranging. With substation indoor operator positioning as a special application background, time synchronization method with microsecond-level synchronization accuracy and low power consumption is studied. Based on the comparison of various typical time synchronization algorithms such as RBS, TPSN, DMTS and FTSP, this paper proposes a time synchronization algorithm for reference and target nodes. The base station and the target node adopt two-way communication, and the reference node adopts the interception method Time synchronization. While guaranteeing the high time synchronization accuracy of the whole network, it also greatly reduces the energy consumption of the sensing node. The physical test results show that the proposed method has the same time synchronization accuracy as the classical synchronization method RBS and significantly reduces the synchronization overhead to meet the requirement of carrying only a limited number of finite energy sensing nodes.