基于IEEE 802.11 p/1609的车辆防追尾碰撞终端系统设计与实现

Design and Implementation of the Vehicle Rear-End Collision Avoidance Terminal System Based on IEEE 802.11 p/1609

车辆追尾碰撞是道路交通最主要的事故形态,车辆防追尾碰撞技术受到国内外学者的广泛关注。文中基于IEEE 802.11p/1609标准设计了车辆防追尾碰撞终端系统。系统由Freescale硬件平台与嵌入式Linux软件平台构成,采用全球定位系统技术实时获取车辆位置等信息,通过WAVE技术使车辆间形成高速双向交互式通信,实现车辆防追尾碰撞实时预警。通过系统通信性能测试和防追尾碰撞预警测试。通信性能测试结果表明,所设计终端系统能够较好实现高效、可靠通信,在静态和动态条件下,车辆采用BPSK调制方式时丢包率不高于10%,可很好的满足车辆安全可靠性需求;而防追尾碰撞预警测试结果表明,该终端系统能比较真实地反映实际的驾车情形,及时给出预警,预警准确率高达97%,具有较好的可用性。

Rear-end collision is one of the main types of traffic collisions on the road.Therefore,rear-end collision avoidance technology has attracted extensive attention of numerous researchers around the world.This paper proposes a rear-end collision avoidance system based on the IEEE 802.11p/1609 protocols.The system consists of a Freescale hardware platform and a software platform based on an embedded Linux OS.Real-time location information of each vehicle is obtained by Global Positioning System(GPS).A wireless access in vehicular environments(WAVE)is used to provide a high-speed and two-way interactive communication between vehicles for real-time rear-end collision warnings.The performance of the system is tested.Test results show that the proposed system can provide high efficient and reliable communications between vehicles.The packet loss rate is less than 10% with Binary Phase Shift Keying(BPSK)under either static or dynamic vehicle operating state.And the results show that the system developed can effectively capture the different driving behaviors and provide warnings in a real time with a high accuracy of 97%.The study results indicate that the proposed system is effective for field implementation.