汽车倒车雷达系统的设计与实现  

Design and Implementation of the Automobile Reversing Radar System

作　　者：吴琼[1] 封维忠[1] 马文杰[1] 

机构地区：[1]南京林业大学信息科学技术学院,江苏南京210037

出　　处：《现代电子技术》2009年第9期191-194,共4页Modern Electronics Technique

摘　　要：为避免汽车倒车过程中发生碰撞，设计一种基于单片机AT89C51的倒车雷达系统，介绍了超声波测距的基本原理，阐述了倒车雷达系统的结构组成、硬件电路设计以及软件设计，并在数据处理部分采用温度补偿消除温度对声速的影响，提高了测距精度。倒车距离采用LCD进行实时显示，并通过语音报警电路对不同距离段做出不同的语音提示。实验表明该倒车雷达系统在30－500cm范围内可实现准确测距，具有可靠性较高、外围电路简单、实用性强等优点。In order to avoid collision during car reversing,a system of reversing radar system based on AT89C51 single chip computer is designed. Basic principle of ultrasonic ranging is introduced. Detailed description on structure composition of the system and design of hardware circuit and software are presented. Temperature compensation is used to eliminate the effect of temperature on sound velocity and improve the ranging precision. Real - time display of distance is realized with LCD in the system and also voice prompt is different when distance changed. Experimental results shows that the measured data is accurate between 30-500 cm. There are several additional advantages of the automobile reversing radar system, such as high reliability, simple peripheral circuit, practical for use and so on.

关 键 词：倒车雷达 超声波测距 AT89C51 LM1812 语音报警 

分 类 号：TP23[自动化与计算机技术—检测技术与自动化装置]