无线传感器网免时间戳双向混合时间同步算法  

Timestamp-Free Bidirectional Hybrid Time Synchronization Algorithm for Wireless Sensor Networks

作　　者：王威 郑鹏超 倪康婷 李红云 WANG Wei;ZHENG Pengchao;NI Kangting;LI Hongyun(Beijing Guowang Fuda Science and Technology Development Co.,Ltd.,Beijing 100070,China)

机构地区：[1]北京国网富达科技发展有限责任公司,北京100070

出　　处：《测控技术》2025年第3期25-32,共8页Measurement & Control Technology

基　　金：国家电网公司科技项目(5200-202155419A-0-0-00)。

摘　　要：为了解决依靠大量同步报文交互来实现时间同步导致的通信开销额外增加的问题,针对无线传感器网络,提出了一种基于免时间戳-双向信息交互机制的混合时间同步算法,无须构造特定的同步报文,节省了通信能耗和传输带宽。首先,建立免时间戳同步处理和主从节点间双向信息交互的混合模型;接着,基于最大似然准则对时钟相对频率和相位偏移进行估计并推导了克拉美罗下界;最后,通过卡尔曼滤波对无线传感器网络中的同步误差进行了优化。仿真结果表明,该算法不仅能够对节点时钟参数真实值进行准确的跟踪,而且实现了能耗与同步精度的平衡,其性能明显优于传统的免时间戳算法。To address the problem of additional communication overhead caused by relying on a large number of synchronous message interactions to achieve time synchronization,a hybrid time synchronization algorithm based on timestamp-free and bidirectional information exchange mechanism is proposed for wireless sensor networks,which does not require the construction of specific synchronization messages and saves communication energy consumption and transmission bandwidth.Firstly,a hybrid model for timestamp-free synchronous processing and bidirectional information exchange between master and slave nodes is established.Then,based on the maximum likelihood criterion,the relative frequency and phase offset of the clock are estimated and the Cramer\s lower bound is derived.Finally,the synchronization errors in wireless sensor networks are optimized by using Kalman filtering.The simulation results show that the algorithm can not only accurately track the true values of node clock parameters,but also achieve a balance between energy consumption and synchronization accuracy,and its performance is significantly better than the traditional timestamp-free algorithm.

关 键 词：免时间戳 双向信息交互 同步机制 卡尔曼滤波 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]