无线传感器网络时钟同步中节点之间的延时分布  

Delay distribution between nodes in clock synchronization of wireless sensor networks

作　　者：伊德尔昆 孙锴[1] 王滨 张增平 YI Deerkun;SUN Kai;WANG Bin;ZHANG Zengping(College of Electronic Information Engineering,Inner Mongolia University,Hohhot Inner Mongolia 010020,China;College of Computer&Information Management,Inner Mongolia University of Finance and Economics,Hohhot Inner Mongolia 010070,China)

机构地区：[1]内蒙古大学电子信息工程学院,呼和浩特010020 [2]内蒙古财经大学计算机信息管理学院,呼和浩特010070

出　　处：《计算机应用》2020年第S02期85-89,共5页journal of Computer Applications

基　　金：内蒙古自治区自然科学基金资助项目(2019MS06009,2020MS06021);内蒙古自治区人才开发基金资助项目。

摘　　要：针对无线传感器网络中每个传感器节点传输前和接收后的时间信息记录间隔之间,无线电信号传递时存在多种不同的随机链路延迟的问题,通过实际实验平台的测试发现了随机延迟的分布情况。首先,利用双向信息交换模式进行理论建模,并分析上下行链路的随机延迟组成的理论部分;其次,通过搭建ZigBee网络平台使两个传感器节点交换时间戳信息,并进行数据采集;最后,利用Q-Q图分布检验拟合优度的方法对采样数据进行检验。理论分析和实验结果表明,基于ZigBee网络的传感器节点交换信息时上行链路和下行链路的随机延迟分布分别服从正态分布;随机延迟会影响时钟同步算法的精确度,因此可以利用该实验结果为前提来设计算法,补偿延迟提高同步精度。In the wireless sensor network,it is found that there are many different random link delays between the recording interval of each sensor node before transmission and after reception.Firstly,the two-way information exchange mode was used for theoretical modeling,and the random delay parts of uplink and downlink were analyzed.Secondly,the exchange of the timestamp information between the two sensor nodes was achieved by building a ZigBee network platform and the collection of data was done further.Finally,the sampling data were tested by using Quantile-Quantile plot distribution test to fit goodness.Theoretical analysis and experimental results show that the uplink and downlink random delay distributions obey normal distribution respectively when sensor nodes exchange information based on ZigBee network.The mentioned random delay will affect the accuracy of various clock synchronization algorithms,so the experimental results in this article can be used as the premise to design algorithm to compensate for the delay and improve the synchronization accuracy.

关 键 词：无线传感器网络 时间同步 时间戳 Q-Q图 随机延迟分布 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN926[自动化与计算机技术—控制科学与工程]