超声波测距离在汽车上的应用.docVIP

目 录 IX Abstract X 第一章 绪论 1 1.1课题背景 1 1.2国内汽车倒车雷达预警系统的现状 1 1.3本课题研究内容 2 第二章 超声波倒车雷达测量仪的测量原理 3 2.1超声波 3 2.1.1超声波概念及特点 3 2.1.2超声波传播速度 3 2.1.3超声波频率 3 2.2超声波传感器 4 2.3超声波倒车雷达测量原理 5 第三章 系统硬件设计 7 3.1硬件电路整体结构说明 7 3.2电源设计 7 3.2.1 复位电路设计 8 3.3超声波发射电路 9 3.3.1 MSP430单片机 9 3.3.2发射电路方案选择 10 3.4超声波接收电路 12 3.4.1运算放大器NE5532简介 13 3.4.2 LM567及锁相环电路 13 3.4.3光电隔离电路及光耦6N136 15 3.5 温度补偿电路 16 3.5.1数字温度传感器DS18B20 16 3.5.2 DSl8B20工作过程及时序 20 3.5.3 DS18B20与单片机接口电路 22 3.6 LCD显示电路 23 3.6.1 LCD模块LCM12864H 23 3.6.2 LCM12864H与单片机接口电路 24 3.7 语音提示电路 25 第四章 系统软件设计 28 4.1系统软件整体结构 28 4.2超声波发射接收程序 28 4.3温度测量程序 29 4.3.1温度测量程序流程图 30 4.4液晶显示程序 31 4.5声音提示程序 31 第五章 系统误差分析 33 第六章 总结 34 参考文献 35 附录1：总电路图 36 附录2：翻译 37  超声波测距离在汽车上的应用 摘 要 关键词超声波；；温度补偿Ultrasonic distance measurement in automotive applications Abstract This article treats of ultrasonic pacing out distances in cars in which the application, we often say that a radar, reversing the car into reverse in the early warning radar system, in common the car into reverse warning apparatus on the basis of computer controlled by technology and ultrasound range of technical and obstacles to show the distance, according to its distance from far and near real-time a call the police, from parking and start when the vehicle and visit the trouble of driving security.  Based on the research vehicle reversing early warning radar system process, the use of theoretical analysis, design and computer simulation, and other research tools, completed a reverse early warning radar system hardware and software design.  Ranging module into the system, the system control module and display alarm module, respectively, and their program of construction of a reversing early warning radar system of systems architecture and design programs in the hardware circuit in detail the use of the SCM technology Visual reversing range early warning radar system to achieve the principle of a MSP430 MCU control unit for the system hardware and software design, and the system was test