【作者】 张杰；

【导师】 殷礼胜；

【作者基本信息】 合肥工业大学 ， 电力电子与电力传动， 2015， 硕士

【摘要】 随着车联网技术的迅猛发展和在解决道路交通安全的作用日益凸显,本课题是在《基于车联网的汽车协同式碰撞预警系统关键技术研究》(编号：1408085ME102)安徽省自然科学基金项目的支持下,将车载Ad Hoc网络(VANET)技术应用到道路中设计车车、车路分布式通信的智能车载终端系统平台中,实现车车、车路通信,具有加强车辆行车安全,减少碰撞风险的意义。终端系统平台以S3C2440A处理器和嵌入式Linux操作系统为基础,结合GPS定位信息处理、ZigBee无线自组网络通信技术、以及信息分析处理完成车辆动态相对分布显示和安全隐患预警技术等,实现车辆行车安全监控。在硬件设计上,终端系统平台选择核心板与功能扩展板可插拔式结构搭接的模块化设计。功能扩展板利用Prote199SE制图软件完成原理图设计,扩展板拥有丰富的外部接口,包括了ZigBee无线通信、USB通信、串口通信、CAN总线通信、LCD显示以及GPS接收机等模块接口电路。在功能设计上,终端系统能够实现在平直角交叉口无红绿灯、急转弯、陡坡以及恶劣天气影响驾驶员视线的路口条件下,车辆行车安全预警提示,同时能够接收路侧节点的道路路况、交通禁止及警告标识信息,进一步减轻驾驶员的负担,不在因为注意力分散或者粗心遗漏交通标识信息而引起的意外事故的发生。通过对以上道路情景车车交会安全的研究,总结出基于GPS数据的车车交会安全隐患预警提示算法。在终端系统通信功能上,采用ZigBee技术无线短程通信通信模块选用TI公司CC2530射频芯片设计,利用TI公司开放的协议栈Z-Stack开发信息传输的应用程序,实现ZigBee通信节点间串口透传方式收发数据。ZigBee无线通信模块经过室外通信测试验证通信模块支持节点相对静止状态250m的通信,在移动环境下节点之间有效通信距离在200m。该通信模块支持实时收发不大于100字节的数据包,能够满足节点速度、位置、航向等状态信息传输。更多还原

【Abstract】 VANET technology has developed rapidly and become more and more important in addressing road safety. This paper is supported by "Key technology research in vehicular collaborative collision warning system based on VANET" (ID: 1408085ME102), which is supported Anhui Provincial Natural Science Foundation. Intelligent vehicular terminal platform takes the advantage of VANET to avoid vehicle collision and ensure driving safety by communication of V2V and V2R. We choose embedded Linux as the operation system based on S3C2440A, combining GPS positioning information processing, ZigBee wireless network transition, and LCD monitor.In the hardware, the core-board and the function-board are removable structure. With protel99SE software, we design the function-board to provide many external data interface, such as ZigBee data interface, USB interface, serial port, CAN bus interface, and LCD monitor interface.In the function, the vehicular terminal system can provide driving safety warnings at intersections without traffic lights, sharp turns, steep slopes and poor weather conditions when the above environment affect the driver’s sight. Meanwhile vehicular terminal can receive messages such as road condition, traffic prohibition, and warning signs from roadside nodes. The message can help driver reduce burden and avoid accidents caused by lack of attention and missing traffic signs. This paper proposes a algorithm based on GPS data for driving safety.Wireless short-range communication module make use of TI’s ZigBee wireless RF chip CC2530F256. The application program is developed based on TI’s ZigBee open protocol stack, Z-Stack, to achieve nodes communication between vehicular terminals. Through outdoor communication test, effective communication distance is 250 meters under static state between nodes,200 meters under mobile state between nodes. The maximum size of packet transmitted is 100 bytes, included nodes speed, position, transmission speed, position, course over ground, etc.更多还原