基于ZigBee的旅客列车车内环境监测系统设计

Design of Interior Environment Monitoring System to passenger train based on ZigBee

针对有线列车通信网络的灵活性差、扩展范围窄,布线繁多等问题,提出应用ZigBee短距离无线通信技术,建立无线自组织树状拓扑网络,应用AODV路由协议算法,通过多级中继方式实现铁道客车车内环境监测和数据传输的解决方案。整个监测系统由协调节点、路由节点和终端传感器节点组成。详细介绍3种类型节点的硬件组成与自组织建网过程,采用Delphi编写上位机监控软件,并对系统进行实际测试。试验表明,监测系统在30 m通信范围内数据传输稳定可靠,维护方便,完全满足车内环境监测的应用需要。

In view of the disadvantages of poor-flexibility,narrow-area expandability and numerous of installing cables for the wired train communication network,a solution based on short area radio communications technology ZigBee was proposed.A wireless Ad Hoc Tree Topological Network was set up and AODV routing protocol algorithm was adopted.By the way of multi-level relay,the interior environment-monitoring and data-transmission of the passenger train were finally implemented.The Monitoring System was composed of coordination nodes,routing nodes and end sensor nodes.The hardware for three kinds of nodes and the process of setting up Ad Hoc Network were introduced in detail.Monitoring software was programmed by Delphi,then the System was tested.Pratical testing showed that the Monitoring System was reliable to transfer data in communication range of 30 meters,and easy to maintain,fully met the needs of train environment-monitoring application.