倒车雷达的设计精读.doc

天津工业大学 毕业设计（论文） 题目：基于单片机的倒车雷达设计 姓 名 马晓阳 学 院 电气工程与自动化学院 专 业 自动化 指导教师 陈奕梅 职 称 副教授 2015年 6月 1 日 摘 要 随着社会经济的发展和交通运输业日益兴旺，汽车的数量在大幅攀升。越来越多的人拥有了自己的汽车，同时由泊车和倒车所引发的事故也越来越多。针对这种情况，设计一种响应快，可靠性高且较为经济的汽车防撞预警系统势在必行。因此，有助于驾驶员泊车和倒车的倒车报警器应运而生。很多科研机构对倒车雷达做了深入研究，按工作方式主要有激光超声波红外毫米波等一系列测量方法。他们的工作原理虽然不完全相同，但最终作用都是通过不同的探测方法测量报警距离。 本设计主要以51单片机芯片为核心，利用超声波进行测距，并根据距离的远近进行相应的提示及显示。在倒车时，能对车后的目标进行准确地探测，并判断障碍物的距离，做出提示，在发现危险目标后报警，让驾驶者便于判断，从而确保车辆的安全倒车，降低交通事故发生率。设计系统主要由单片机主控模块、显示模块、报警模块、超声波测距模块、键盘模块组成。本设计运用二个不同方向的超声波传感器测量倒车距离，并在显示屏上显示最小的测量距离。当超过最小报警距离时，开始报警。且报警的频率随着距离的减小而增加。 关键词：倒车雷达； AT89C52单片机； 超声波测距； 报警系统 硬件电路； 软件设计 ABSTRACT With the development of social economy?and transportation industry is booming,?a sharp rise in the number of?cars.?More and more?people have their own cars,?at the same time caused by parking and reversing?accidents are also increasing.?In view of this situation,?the design of a?fast response,?be imperative?vehicle anti-collision warning system?with high reliability and?economical.?Therefore,?reverse alarm?help drivers parking and?reversing?the emerge as the times require.?Many scientific research institutions of reversing radar do in-depth research, according to work mainly laser ultrasonic infrared millimeter wave, a series of methods of measurement.?They work?although?not exactly the same,?but?the final?effect is?measured by the?detection method of?different alarm?distance. This design mainly to 51 single chip as the core using ultrasonic ranging, and according to the distance of the corresponding prompt and display.?In reverse, can accurately detect the targets on the rear of the car, and judgment the distance to the obstacle, make a prompt, alert after the discovery of dangerous targets, lets the driver for the judgment, so as to ensure the vehicle safety reversing, reduce the incidence of traffic accidents.?Design system consists of MCU