ZigBee-WiFi协同无线传感网络的节能技术  

Energy-saving technology of ZigBee-WiFi cooperative wireless sensor networks

作　　者：董哲[1] 宋红霞[1] 

机构地区：[1]北方工业大学现场总线与自动化技术北京市重点实验室,北京100144

出　　处：《计算机工程与设计》2015年第1期22-29,共8页Computer Engineering and Design

基　　金：国家自然科学基金项目(61174116);城市道路交通智能控制博士培养基金项目(PXM 2013_014212_000028)

摘　　要：为使无线传感网络实现高效节能,提出一种新颖的基于ZigBee-WiFi协同方式进行的时钟同步机制。ZigBee无线传感节点可以通过内置的接收信号强度寄存器(RSSI),感知同一频段下WiFi周期性发送的信标帧,并用其作为参考时钟,通过补偿校正本地的时钟,但此方法校正后时钟偏差较大;在此基础上提出一种基于状态空间的时钟模型,采用卡尔曼滤波器和离散线性定常系统的二次型最优控制校正算法跟踪并校正状态变量,获得很好的时钟校正精度。分析时钟同步误差与校正周期的关系,综合多方面因素,与工业中常用的异步时钟机制进行对比,比较结果表明,该时钟同步机制使ZigBee网络节能效果显著提高。To achieve efficient economy energy in the wireless sensor network, a novel ZigBee-WiFi eooprative synchronise power saving scheme was presented. ZigBee wireless sensor node sensed the periodical beacon frame of WiFi which worked in the same radio spectrum through the built-in receive signal strength register （RSS1）, and used it as a reference clock to adjust the local clock. However, the clock deviation was larger while using this method. A clock model based on the state space was proposed then, Kalman filter and DLQR regulator were adopted to trace and regulate the state variable. Finally, the trade-off between the clock synchronization error and correction cycle was analyzed. Considering comprehensive factors, compared with the asyn- chronous clock mechanism corrmlonly used in industry, the results show that the energy-saving effect of ZigBee network is signifi- cantly improved using the proposed clock synchronization mechanism.

关 键 词：无线传感网络 ZIGBEE WIFI 卡尔曼滤波 离散线性系统的二次型最优控制 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]