摘要
考虑到传统的时钟同步技术在信息交互过程中产生的延迟具有不确定性,为了消除其对时钟同步的影响,提出了面向无线传感网络的同步时钟技术研究。通过对任意一个网络节点在真实物理时间的本地时间进行变换处理,构建无线传感网络的线性时钟模型,根据高斯分布所具有的加减特性,计算两个连续同步轮次的动态响应时间差值,在离散形式下,构建无线传感网络观测模型。通过计算无线传感网络时钟差值的均值,得到无线传感网络节点的时间戳,将无线传感网络节点数据交互误差补偿的目标函数转换成向量的形式,补偿无线传感网络节点数据交互误差,实现无线传感网络的时钟同步处理。实验结果表明,在微秒级延迟下,该技术的同步精度仍较高,可以有效消除网络信息延迟的不确定性对同步时钟的影响。
Considering the uncertainty of the delay caused by traditional clock synchronization technology in the process of information interaction,in order to eliminate its influence on clock synchronization,a research on synchronous clock technology for wireless sensor networks is proposed.By transforming the local time of any network node in real physical time,the linear clock model of wireless sensor network is constructed.According to the addition and subtraction characteristics of Gaussian distribution,the dynamic response time difference between two consecutive synchronous rounds is calculated,and the observation model of wireless sensor network is constructed in discrete form.By calculating the average value of clock difference of wireless sensor network,the time stamp of wireless sensor network nodes is obtained,and the objective function of data interaction error compensation of wireless sensor network nodes is converted into vector form to compensate data interaction error of wireless sensor network nodes,thus realizing clock synchronization of wireless sensor network.The experimental results show that under microsecond level delay,the synchronization accuracy of this technology is still high,and it can effectively eliminate the impact of network information delay uncertainty on the synchronization clock.
作者
蔡云
CAI Yun(Faculty of Engineering,Anhui Sanlian University,Hefei Anhui 230601,P.R.China)
出处
《保山学院学报》
2024年第2期77-82,共6页
JOURNAL OF BAOSHAN UNIVERSITY
基金
安徽省高等学校省级自然科学研究重点项目“面向无线传感器网络的精准时钟同步技术研究”(项目编号:2022AH051983)。
关键词
无线传感网络
频率偏移
相位偏差
误差补偿
时钟同步
观测模型
Wireless sensor network
Frequency offset
Phase deviation
Error compensation
Clock synchronization
Observation model
