电气工程及其自动化专业【毕业设计 文献综述 开题报告】汽车倒车防撞报警系统软件设计.doc

电气工程及其自动化专业【毕业设计+文献综述+开题报告】汽车倒车防撞报警系统软件设计 （20_ _届） 本科毕业设计 汽车倒车防撞报警系统软件设计 摘 要 本文开始就此次选题的背景和意义做了说明，以及针对倒车雷达在国内外的研究现状作了较详细的分析。 本文详细介绍了此次基于AT89C51单片机的超声波脉冲测距倒车雷达系统，它是利用超声波在空气中的传播速度为已知条件，通过超声波反射回来的时间来测量距离。本文描述了系统设计的理论基础以及超声波传感器部分的电路设计。 论文简述了超声波测距的发展和基本原理，并且介绍了超声波传感器的原理及它所具有的特性，还对超声波的发射、接收信号电路及报警电路做了概述。在单片机方面论文介绍了AT89C51单片机的芯片结构和引脚功能，并对单片机与超声波测距结合作了有关介绍。 本文还论证了倒车雷达系统的实用性，分析了几种可能会影响超声波测距精度的因素，阐述了如何应对的一些方法。 关键词：单片机，超声波，测距 The Hardware Design of Anti-collision Alarm System for Auto Reversing Abstract The beginning of the topic to the background and significance of this was illustrated,and it made a more detailed analysis for reversing radar research status at home and abroad. This paper describes the AT89C51 microcontroller based ultrasonic pulse ranging reversing radar system, It is the use of ultrasonic propagation velocity in the air which path is known, reflected back by the time ultrasound to measure the distance. This article describes the theoretical basis of system design and the ultrasonic sensor part of the circuit design. Paper outlines the development and the basic principles of the ultrasonic distance measurement, And introduced the principle of ultrasonic sensors and it has the features, but also on the ultrasound transmitting and receiving signal circuits and alarm circuits were outlined. This paper introduces the SCM AT89C51 microcontroller chip architecture and pin functions, and the combination of microcontroller and ultrasonic distance measurement made on introduction. This article also demonstrates the practicality of reversing radar system, analysis of several that may affect the accuracy of ultrasonic ranging factors ,and it explained how to deal with the methods.朗读显示对应的拉丁字符的拼音Keywords: SCM,Ultrasonic, measure distance 目 录 摘 要 I Abstract II 1 绪论 1 1.1选题的背景与意义 1 1.2汽车雷达国内外发展现状 2 1.2.1 汽车雷达的历代变革 2 1.2.2 汽车雷达的国内研究 3 1.2.3 汽车雷达的国外研究 3 1.3课题研究的主要内容 4 2系统方案设计 5 2.1系统方案设计 5 2.2系统方案评价 5 3 超声波测距原理 7 3.1超声波及其基本性质 7 3.2 超声