基于ZigBee的车载交通灯监视系统的研究与设计

发布时间：2018-11-22 06:56

【摘要】：城市交叉路口是交通系统的关键组成部分,路口交通秩序主要由交通灯来指挥,交通灯安装在各个路口,通过红、黄、绿三种颜色灯变换实现交叉路口交通的指挥。近年来,随着城市车流量不断增加,交通压力持续加大,对于驾驶员观察红绿信号灯,会出现被前车遮挡,被路边绿化、广告牌等障碍物遮挡,以及暴风雨、大雪、雾霾等恶劣天气造成能见度降低,都会阻碍驾驶人及时获取交通信号灯状态,极易造成交通事故,存在安全隐患。为了使驾驶员及时获取前方路口交通灯情况,减少安全隐患,更方便的驾驶车辆,结合近年来无线网络技术和传感器技术的发展,本文设计了一种基于无线网络ZigBee的车载交通灯监视系统,整个系统包括交通灯信号的产生部分,发射部分,接收部分,显示部分,完整地将路口信息及信号灯状态实时传输到车载终端上,使驾驶员对路口情况一目了然,避免干扰。本设计利用ZigBee的自组网的技术,路口建立ZigBee交通信号灯网络,携带车载终端的车辆进入网络覆盖范围内自动加入该网络。由于十字路口东西和南北方向信号灯状态相反,需结合指南针传感器判别车辆前进方向,实时获取当前行驶方向上的信号灯信息,在车载终端液晶屏上显示并伴有语音播报,帮助驾驶员及时获取前方道路交通信号灯情况,提前控制汽车做出应对,起到辅助驾驶的作用。在硬件方面,交通灯信号产生部分使用STC89C52单片机控制,ZigBee的发射和接收使用CC2530芯片+功率放大芯片RFX2401C构成的ZigBee模块,终端显示部分使用HMI智能串口屏,添加语音模块实现语音播报,使车载终端更加人性化。软件方面主要是对ZigBee协议栈Z-stack的移植和修改,传感器代码的移植,对各个接口的设计,以及人机交互界面的设计。最后对系统进行实测,该系统监视准确,能为驾驶员提供及时、准确的信号灯信息。
[Abstract]:Urban intersection is a key component of traffic system. Traffic order is mainly directed by traffic lights. Traffic lights are installed in all intersections to realize traffic command at intersections by changing red, yellow and green color lights. In recent years, with the increasing traffic flow and traffic pressure in cities, for drivers observing red and green traffic lights, there will be obstructions in front cars, roadside greening, billboards and other obstacles, as well as storms and heavy snow. Poor visibility caused by bad weather such as haze will prevent drivers from getting traffic lights in time. It is easy to cause traffic accidents and there are hidden dangers in safety. In order to make the driver get the traffic lights in front of the road in time, reduce the hidden danger of safety, and drive the vehicle more conveniently, combined with the development of wireless network technology and sensor technology in recent years, A vehicle traffic light monitoring system based on wireless network ZigBee is designed in this paper. The whole system includes the generating part of traffic light signal, the transmitting part, the receiving part and the displaying part. The information and signal state of the intersection are transmitted to the vehicle terminal in real time, so that the driver can understand the situation of the intersection at a glance and avoid interference. Based on the technology of ZigBee's ad hoc network, the ZigBee traffic light network is set up at the intersection, and the vehicle carrying the vehicle terminal enters the network coverage area automatically to join the network. Because of the opposite state of the signal light between the east and the south direction at the crossroads, it is necessary to distinguish the direction of the vehicle with the compass sensor, to obtain the signal light information of the current driving direction in real time, and to display and accompany the voice broadcast on the LCD screen of the vehicle terminal. Help the driver to get the traffic lights in time, control the car in advance and assist in driving. In the aspect of hardware, the traffic signal generation part is controlled by STC89C52 singlechip, the ZigBee module composed of CC2530 chip power amplifier chip RFX2401C is used to transmit and receive ZigBee, and the terminal display part uses HMI intelligent serial port screen. Add voice module to achieve voice broadcast, so that the vehicle terminal more humanized. The software is mainly about the transplantation and modification of ZigBee protocol stack Z-stack, the transplantation of sensor code, the design of each interface, and the design of man-machine interface. Finally, the system is monitored accurately and can provide the driver with timely and accurate signal light information.
【学位授予单位】：北方民族大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN92;TP277;U463.6

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