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Approach for energy-efficient time synchronization with high-accuracy in wireless sensor networks
Author(s): Xu Dingxin, Yi Weidong, Chen Yongrui, Sun Hao
Pages: 53-
57
Year: 2012
Issue:
6
Journal: Electronic Measurement Technology
Keyword: 无线传感器网络; 时间同步;
Abstract: 时间同步是无线传感器网络的一种关键支撑技术.针对面向数据采集的WSN应用场景提出了一种轻量级的基于数据采集树的低能耗,高精度时间同步方案LCTS(lightweight collection tree based synchronization).在Tmote-Sky硬件平台上实现了该方案.结合大量实验数据分析了同步时延的误差分布特性,以及时域变化特性.在此基础上提出了定值校正法和跟踪校正法2种估计同步时延的方法.理论分析及实验测试表明LCTS在保持低能耗和低开销的同时能实现微秒级的同步;跟踪校正法法相比定值校正法具有较高的同步精度,同步误差的平均值和均方差分别下降约57.5%和49%.
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