文档介绍：基于单片机的超声波倒车雷达系统设计
摘要
随着我国汽车产业的高速发展,我国开始进入私家车时代,汽车的数量逐年增加,造成公路、街道、停车场、车库等越来越拥挤。汽车驾驶员越来越担心车的安全了,其中倒车就是一个典型。倒车时,驾驶员疲于前瞻后顾,很容易就发生追尾等碰撞事故。因此,增加汽车的后视能力,研制汽车后部探测障碍物的倒车雷达便成为近些年来的研究热点。本文设计的倒车雷达预警系统主要是针对汽车倒车时人无法目测到车尾与障碍物体的距离而设计开发的。该系统将微计算机技术与超声波的测距技术、传感器技术等相结合,可检测到汽车倒车中,其障碍物与汽车的距离,通过LED数码管显示距离,并根据障碍物与车尾距离远近实时发出报警等级。工作时,超声波发射器不断发射出一系列连续脉冲,给测量逻辑电路提供一个短脉冲。最后由信号处理装置对接收的信号依据时间差进行处理,自动计算出车与障碍物之间的距离。本文介绍了基于AT89C51单片机的超声波测距器,其由超声波发射模块、信号接收模块、单片机处理模块、数码显示以及声光告警显示模块等部分组成。文中运用理论分析、计算机仿真等研究手段,完成了倒车测距仪硬件和软件的设计,并在测距算法上进行了改进,使测距速度更快。系统设计中采用了模块设计思想,简化了调试工作量,最终很好完成了超声波测距倒车雷达系统的硬件设计、软件设计及系统调试。
关键词:汽车倒车测距仪;超声波;AT89C51
DESIGN OF ULTRASONIC VEHICLE
REVERING SYSTEM WITH
ULTRASONIC BASEDON MCU
Abstract
With the rapid development of China's automobile industry, China began to enter into the era of private cars, the car number increases year by year, causing the highway, streets, parking lot, garage, more and more crowded. Car drivers are increasingly worried about the safety of the car, the reverse is a typical. Therefore, to increase the ability of the car after depending on and developing the back of my car detection of radar e obstacles back research topic in recent years. In this paper the reverse radar warning system design is mainly directed against the car back to the rear of the car and people can't visual obstacle the distance of the object and the design and development. This system makes bination of puter technology and the ultrasonic ranging technology, the sensor technology, etc. It can detect the car back to the obstacles and the automobile distance, through the LED shows distance,and according to the obstacle and thetailstock which far and near sends out real-time warning work, ultrasonic transmitters continuously launch a series of continuous pulse, to logic circuit provides a short pulses. Finally by signal processing device of received signal processing according to the time, calculating the distance between the car and the obstacles automatically. This paper intr