水声传感节点数据低时延传输的时钟同步算法  

Clock Synchronization Algorithm for Underwater Acoustic Sensor Node Data Transmission with Low Delay

作　　者：李丽丽[1] 杨欣宇[1] 滕艳平[1] 陈久玲 LI Li-li;YANG Xin-yu;TENG Yan-ping;CHEN Jiu-ling(College of Computer and Control Engineering,Qiqihar University,Qiqihar Heilongjiang 161006,China)

机构地区：[1]齐齐哈尔大学计算机与控制工程学院,黑龙江齐齐哈尔161006

出　　处：《计算机仿真》2020年第12期189-192,198,共5页Computer Simulation

基　　金：黑龙江省教育厅面上项目(135209235);黑龙江省高等教育教学改革项目(SJGY20190710)。

摘　　要：传统的时钟同步算法是在不同网络层延时假设一致的情况下进行的,导致误差补偿过大、误差消除效果不够理想。提出水声传感节点数据低时延传输的时钟同步算法。首先通过时钟同步原理,分析误差产生原因,将正确预测链路的传播延迟作为时钟同步算法的核心;其次,对不同传感器节点时钟值采样,实现子样空间越大,同步精准率越高;然后记录并传输时间戳,获取本地时钟与参考时钟差值,计算时钟同步的累计误差,最后利用自回归积分滑动控制算法对同步累计误差补偿,从而实现低时延传输的时钟同步。仿真结果表明,所提时钟同步算法可以降低水下传感网络的延时性、提高通信效率,符合水下通信要求。Traditionally,the clock synchronization algorithm was based on the same delay assumption of different network layers,leading to excessive error compensation and unsatisfactory error elimination.Therefore,an algorithm of clock synchronization for underwater acoustic sensor node data transmission with low delay was presented.Firstly,the error cause was analyzed by the principle of clock synchronization.The correct prediction of link propagation de-lay was regarded as the core of clock synchronization algorithm.Secondly,the clock values of different sensor nodes were sampled,so that the larger the sub-sample space,the higher the synchronization accuracy rate.After that,the time stamp was recorded and transmitted to get the difference between local clock and reference clock.Moreover,the accumulated error of clock synchronization was calculated.Then,the autoregressive integral sliding control algorithm was used to compensate the accumulated synchronization error,and thus to realize the clock synchronization with low-delay transmission.Simulation results prove that the proposed algorithm can reduce the delay of underwater sensor network,improve the communication efficiency,which can meet the requirements of underwater communication.

关 键 词：水声传感节点 低时延传输 时钟同步 自回归积分滑动 误差补偿 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]