超声波实现无接触测距的倒车雷达系统的设计与实现毕业设计.doc

超声波实现无接触测距的倒车雷达系统设计 摘 要 随着整个国家生活水平的提高，购车族也日益增多，汽车早已成为人们生活的必需品，然而汽车给人们带来方便快捷的同时，也出现了许许多多的交通事故，其中因倒车引起的剐蹭事件则数不胜数，给人们带来了许多不必要的经济损失，尽管每辆车都有后视镜，但是我们要知道后视盲区却不可避免，针对这一问题，设计出一个响应快、灵敏度高的倒车雷达势在必行。 本文利用超声波实现无接触测距，设计出一种倒车雷达系统，本文主要是利用超声波穿透性强，衰减小，反射能力强等特点利用超声波发射与接收电路实现无接触测距环境温度对超声波波速影响，使用DS18B20构成的温度测量电路，通过温度补偿法对速度进行校正直接读取温度值，得出超声波在某一温度下的波速，测得并显示距离，再根据显示的距离控制蜂鸣器的发声频率。 设计单片机的接口控制电路，对温度信号、超声波发射与接收信号进行采集与控制，实现温度补偿与距离报警 关键字：超声波测距；倒车雷达；STC89C52RC；温度补偿 Design to non-contact ultrasonic ranging reversing radar system Abstract With the improvement of living standards across the country, car buyers are increasing, car has become a necessity of life, cars bring the people convenient, but also appeared in many traffic accidents, which caused by reversing rub cut events are numerous, gave rise to a lot of unnecessary economic losses, even though vehicle has rear-view mirror, but we need to know blind Spot was inevitable, to solve this problem, design a fast response, high sensitivity reversing radar imperative. In this paper, the use of ultrasound to achieve non-contact distance measurement, design a reversing radar system, this paper is the use of ultrasound penetrating strong, low attenuation, high reflectance characteristics, the principle of ultrasonic distance measurement with STC89C52RC microcontroller combines the use of ultrasound the transmitter and receiver circuits to achieve non-contact distance measurement. Ultrasonic velocity of the ambient temperature influence on the use DS18B20 temperature measurement circuit constituted by the temperature compensation method of the speed correction value is directly read the temperature, and thus the velocity of the ultrasonic wave at a certain temperature, and display the measured distance, then control the buzzer sound frequencies depending on the distance display. On the basis of the principles and development of ultrasonic ranging presentation on the design STC89C52RC microcontroller interface control circuit of the temperature signal