无线传感器网络一致性时间同步协议研究

发布时间：2018-02-11 08:59

本文关键词： 无线传感器网络时间同步一致性传输延迟 MATLAB仿真　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着微机系统、无线通信技术、数字电子技术的进步,低功耗、低成本、多功能的无线传感器网络设备得到了快速的发展,时间同步作为无线传感器网络的一项支撑技术也受到了广泛的关注,成为当下研究的热点,而基于一致性的时间同步协议由于其是完全分布式的且可补偿时钟的斜率和偏差,而受到了越来越多的关注。大部分的研究成果都是基于理想的情况下设计的。本文首先分析了无线传感器网络的现状;其次,介绍了一致性理论基础、图论知识、时钟模型以及一致性方面经典的时间同步算法;接着针对传感器节点交换信息的过程中存在传输延迟的情况,本文提出了带延时的一致性时间同步协议和基于最小二乘估计的时间同步协议,两种时间同步协议均是通过建立节点的逻辑时钟,然后分别进行逻辑时钟斜率和偏差的补偿来达到节点间的时间同步的。在节点的时钟更新过程中,相对时钟斜率的准确性直接决定了协议的性能,所以本文中两种时间同步协议分别利用了加权平均和最小二乘估计的方式提高了相对时钟斜率的准确性,从而使得在传输延迟满足特定分布的情况下,网络中节点间的时间同步仍然能够实现,其中在基于最小二乘估计的时间同步协议中引入了衰减因子。本文对衰减因子的作用进行了探究,接着对两种时间同步协议用MATLAB进行了仿真,验证了在存在传输延迟的情况下原始的时间同步协议不可行,提出的两种协议能够有效地降低延迟的影响,保证了时间同步的收敛性,最后利用CC2530模块搭建无线传感器网络的硬件平台,在该平台上对两种协议的可行性进行了验证。
[Abstract]:With the computer system, wireless communication technology, digital electronic technology, low power consumption, low cost, multi-function wireless sensor network equipment has been rapid development, time synchronization is a supporting technology of wireless sensor network has received extensive attention and become the focus of current research, and based on the consistency of time because of the synchronization protocol for slope and deviation of fully distributed and can compensate the clock, and has attracted more and more attention. The majority of research results are based on the ideal case design. This paper first analyzes the current situation of wireless sensor network; secondly, introduces consistency theory, graph theory, model and clock the consistency of the classical time synchronization algorithm; transmission delay is then process for the sensor node to exchange information, is proposed in this paper. The consistency with the delay The time synchronization protocol and the least squares estimation based on time synchronization protocol, two synchronization protocols are established by logical clock node, then the logic clock slope and deviation compensation to achieve time synchronization among nodes. The nodes of the clock update process, the relative accuracy of the clock slope is directly determined by the agreement the performance of two kinds of time, so this paper use synchronization protocol weighted average and least square estimation method to improve the accuracy of relative clock slope, which makes the transmission delay to meet the specific distribution, nodes in the network time synchronization is possible in which the attenuation factor into the least squares estimation of the time synchronization protocol based on this paper explored and analyzed the attenuation factors of the two kinds of time synchronization protocol using MATLAB simulation, test The time in the original transmission delay case synchronization protocol is not feasible, the two protocols proposed can effectively reduce the influence of delay, to ensure the convergence of time synchronization, and finally build a wireless sensor network using the CC2530 module of the hardware platform, the platform on the feasibility of the two protocols are verified.

【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP212.9;TN929.5

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