GPS辅助测距下的无线传感器网络时间同步误差分析  

Time Synchronization Error Analysis of Wireless Sensor Networks Based on GPS Assisted Ranging

作　　者：徐兰声 张雄 XU Lansheng;ZHANG Xiong(School of Artifical Intelligence&Information Engineering,West Yunnan University,Lincang Yunnan 677000,China;College of Teacher Education,West Yunnan University,Lincang Yunnan 677000,China)

机构地区：[1]滇西科技师范学院智能与信息工程学院,云南临沧677000 [2]滇西科技师范学院教师教育学院,云南临沧677000

出　　处：《传感技术学报》2023年第9期1467-1472,共6页Chinese Journal of Sensors and Actuators

基　　金：2022年度云南省教育厅科学研究基金教师类项目(2022J1024);地方高校联合专项基础研究计划-面上项目(202101BA070001-197)。

摘　　要：传感节点通过交互同步信号推算对应的参变量时,会出现不受控制的时延,影响误差上下限;对这种误差形成分析机制,是十分重要的。提出了一种无线传感器网络时间同步误差分析方法。通过GPS基站测量无线传感器网络信号的距离参数,利用用户接收器校正网络位置,获得矩阵信息;预测本地和物理时钟间相关性,或本地时钟自身的关联性,作为误差分析的基础条件。把时间同步误差分割成服从于正态分布的三个部分,通过线性时间误差在距离向加入相位项,获得网络误差的具体分析情况。通过仿真证明:300 s内子区间的时钟偏差低于200μs。即该方法能够准确计算出网络时间同步误差值,明确传感网络运行状况,以保证通信安全稳定。When the sensor node calculates the corresponding parameter variables through the interactive synchronization signal,there will be uncontrolled time delay,which will affect the upper and lower limits of the error.It is very important to analyze the error formation mechanism.A time synchronization error analysis method for wireless sensor networks is proposed.The distance parameter of wireless sensor network signal is measured by GPS base station,and the network position is corrected by user receiver to obtain matrix information.The correlation between the local and physical clocks,or the correlation of the local clock itself is predicted as the basic condition for error analysis.The time synchronization error is divided into three parts subject to the normal distribution,and the specific analysis of the network error is obtained by adding the phase term in the distance direction to the linear time error.The simulation shows that the clock deviation of sub interval within 300 s is less than 200μs.That is,this method can accurately calculate the network time synchronization error value and clarify the operation status of the sensor network to ensure the safety and stability of communication.

关 键 词：无线传感器网络 GPS模块 时间同步 误差分析 晶振频率 正态分布 

分 类 号：TP393.0[自动化与计算机技术—计算机应用技术]