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基于IEEE 802.15.4/ZigBee协议的井下定位系统设计
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摘要
目前,国家对煤矿安全生产的重视程度已提升到前所未有的高度,但是矿难还在不断发生,而灾难发生后抢险救灾的不力暴露出目前监控系统的弊端:监控系统对入井人员管理困难,井上人员难以及时掌握井下人员的动态分布及作业情况。
     本文从网络构成、协议栈等角度深入研究了IEEE 802.15.4协议和ZigBee无线通信技术,将ZigBee技术与几种无线传输技术进行比较总结出了ZigBee技术优势。随后对目前的主流井下人员定位系统(包括基于RFID的井下定位系统和基于ZigBee技术的井下定位系统)进行介绍和比较,得出了ZigBee技术应用于井下人员定位系统具有低成本、安全可靠、低功耗等多种优势。在此基础上,设计了基于IEEE802.15.4/ZigBee协议的井下定位系统总体方案。本系统采用ZigBee无线网络与CAN总线结合的方式构建数据通信平台,将井下工作人员的定位数据和瓦斯浓度等信息传输到井上控制中心。
     本文介绍了基于IEEE 802.15.4/ZigBee协议的井下定位系统功能和结构。详细阐述了系统硬件设备的电路设计,包括基于CC2430/CC2431的节点、网关节点和CAN总线模块;介绍了系统设备软件设计,并展示了简单的演示系统以检验定位效果。本文中的ZigBee网络开发是基于TI的ZigBee协议栈Z-Stack和IAR Embedded Workbench集成开发环境。
     最后,对本课题未来的发展方向,ZigBee技术在其他领域的应用以及课题下一步开展的工作做了展望。
Mining safety is getting more important in China now. But the mining disaster happened over and over, dealing with the emergency doesn't work well due to absence of mining person position. Current monitor system has no dynamic distributing information of mining person.
     This paper in-depth studies upon IEEE802.15.4 protocol and ZigBee wireless network technology from the aspects of networking and protocol stack. The advantage of ZigBee which contains low-cost, security and low-power can be obtained compared with other technologies. Then the paper introduces the underground personal positioning system based on ZigBee and RFID technologies, which are the two mainstream systems. It can be seen clearly that ZigBee is more applicable. On this basis, the system designed the comprehensive positioning system of IEEE802.15.4 and ZigBee protocol. The data communication platform, transmitting the data of positioning and gas concentration to the surface controlling center, is built by the combination of ZigBee wireless network system and CAN bus.
     This thesis introduces the structure and function of the underground positioning system based on the IEEE 802.15.4/ZigBee protocol. The paper presents the electrical circuits designing of the hardware devices for the system, which includes CC2430/CC2431 nodes, gateway nodes and CAN bus modules, and also tests the reliability of positioning by a simple demonstrating system. The construction of the ZigBee network is fulfilled with the assistance of Z-Stack and IAR Embedded Workbench environment.
     In the end of the thesis, a prediction of the future research subjects is shown; the optimization of the positioning system and the latent application of the ZigBee technology in other areas are also demonstrated.
引文
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