Adaptive temperature compensation time synchronization method for wireless sensor network

被引：0

作者：

Sun Y. ^{[1
]}

Yu J. ^{[1
]}

Wang X. ^{[1
]}

机构：

[1] Ministerial Laboratory of ZNDY, Nanjing University of Science and Technology, Nanjing

来源：

Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | 2019年 / 40卷 / 01期

关键词：

Adaptive interval; Frequency shift estimation; Time synchronization; Wireless sensor network;

D O I：

10.19650/j.cnki.cjsi.J1803835

中图分类号：

学科分类号：

摘要：

Time synchronization is the foundation for the cooperative work of multi-agent networks and has great significance. The clock of a low-cost wireless sensor network node is subject to the influence of the environment factors, which leads to the increasing of the node time synchronization error and network channel overhead. Aiming at this problem, a novel network time synchronization method with low clock re-synchronization interval and adaptive temperature compensation for WSNs is proposed. Firstly, a node frequency shift dynamic estimation model with temperature compensation is proposed based on the two-way message exchange time synchronization model. Then, the Almon function weighted summation method is adopted to fuse the temperature and frequency shift data, and solve the problems of data sampling rate un-matching and high model dimension; next, in order to further improve the time synchronization accuracy, a Kalman filter is used to filter the estimation values of the frequency shift and phase shift, and the system state posteriori estimation value is used to compensate the node local time. At last, an adaptive re-synchronization decision function with minimized failure risk is designed according to the time synchronization accuracy requirement of the IEEE 802.15.4 standard, which improves the node re-synchronization interval and decreases the channel overhead to the maximum extent. Experiments in high, low temperature chamber, indoor and outdoor environments were conducted to verify the proposed method. The experiment results show that compared with that of FTSP time synchronization protocol, the average time synchronization error of the proposed ATCTS method is reduced by 97.4%, and the average time synchronization interval is 324 minutes in outdoor environment. © 2019, Science Press. All right reserved.

引用

页码：132 / 141

页数：9

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