摘要
时间同步是水下传感器网络的关键技术,由于海洋中采用水声通信时传播时延高且存在多普勒频移,导致使用射频通信的陆上时间同步算法无法直接应用于水下环境。基于多普勒测速原理和节点在水下的移动性,提出一种新型的时间同步CD-Sync算法。利用具有聚类特性的分簇模型选择合理的簇首节点,并与水面信标节点进行簇内同步,且在同步过程中,同步节点利用多普勒原理估算节点间的相对移动速度,从而计算节点间的传播延迟。实验结果表明,与基于分簇时间同步MU-Sync算法和分布式时间同步NU-Sync算法相比,该算法可在缩短节点间距离并加快节点间同步收敛速度的同时,有效提高时间同步的精度。
Time synchronization is the key technology of underwater sensor networks.Due to the high propagation delay and Doppler frequency shift of underwater acoustic communication in the ocean,the land-based time synchronization algorithm using radio frequency communication can not be directly applied to the underwater environment.Based on the principle of Doppler velocity measurement and the mobility of nodes under water,this paper proposes a new time synchronization CD-Sync algorithm.The cluster model with clustering characteristics is used to select a reasonable cluster head node and synchronize with the water surface beacon node within the cluster.In the process of synchronization,the synchronization node uses Doppler principle to estimate the relative moving speed between nodes,so as to calculate the propagation delay between nodes.Experimental results show that,compared with MU-Sync algorithm based on clustering time synchronization and NU-Sync algorithm based on distributed time synchronization,this algorithm can shorten the distance between nodes and accelerate the convergence speed of synchronization between nodes,while effectively improving the accuracy of time synchronization.
作者
姚宇婕
刘广钟
孔维全
YAO Yujie;LIU Guangzhong;KONG Weiquan(College of Information Engineering,Shanghai Maritime University,Shanghai 201306,China)
出处
《计算机工程》
CAS
CSCD
北大核心
2021年第4期147-152,共6页
Computer Engineering
基金
中国博士后科学基金(2014M561512)
上海市教委科研创新项目(14YZ110)。
关键词
水下传感器
多普勒测速
分簇
传播延迟
时间同步
underwater sensor
Doppler velocity measurement
clustering
propagation delay
time synchronization
