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摘要汽车电子化被认为是汽车技术发展中的一次新革命，通过在汽车上安装各种电子设备，可以使汽车的性能进一步提高。超声波倒车雷达预警系统，是将超声波测距技术应用于汽车的一种电子设计，可以应用到高档汽车中。其不仅可以提高了汽车的智能化程度，也能减少由于倒车后视不良产生的事故，具有较高的实际意义。
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本文调研了国内外倒车雷达现状和发展情况，对超声测距的发展和原理，及所用超声波传感器的原理和特性进行了介绍。根据系统功能的要求，提出了系统的总体构成。倒车雷达部分分为发射接收模块、系统控制模块和显示报警模块。本文。研究了以PIC单片机为主控单元的系统硬件和软件设计硬件部分主要阐述了基于51内核结构的AT89S52单片机作为主控制器的汽车倒车雷达系统的硬件电路的设计过程。软件部分采用模块化设计思想，将系统的软件设计分为主程序、测温模块、超声波测距模块、LCD显示模块和语音报警模块等功能模块的程序设计，由主程序实现对各分模块的调度管理。本系统具有集成度高、测量范围广、成本低等特点，能满足驾驶员在实际倒车中的需求，达到了原设计要求，本课题的研究具有一定的理论和实用价值。9878
关键词 倒车雷达 超声波测距 单片机 语音报警 毕业设计说明书（论文）外文摘要
Title A Design of Car Reversing Radar System With Ultrasonic Wave
Abstract
The automobile electrification was considered to be a revolution in automobile technological development. We can install some equipment on the automobile to improve the automobile's function. The reversing radar alert system applies the ultrasonic distance measuring and the display on LCD screen technology in the automobile electron research.
The paper introduces a kind of Ultrasonic Pulse Distance-Measurement Parking Distance Control is system in detail based on microcontroller. The system could measure certain distance with the reflected wave on condition in which the speed of transmitting wave is fixed. It generally specifies the theoretical foundation of the system, the electronic design of the ultrasonic sensor, and the benefits of Jujutsu MB89F538 microcontroller for the system. It is limited in indoor range in advance. So the design of the system and the choice of the components are decided according to this reason. This paper summarizes the development and fundamental principle of ultrasonic detection. Then it presents the theory and characters of ultrasonic sensor. Moreover, it proposes the whole structure of the system by introducing the function of ultrasonic Distance-Measurement. And then the transmission, receiver, detection, channel control, display scheme of this Distance-Measurement system is brought out. The design theory of the thesis takes practicability for principal objective, use transmitting-receipting transducer, by means of Optical Time Division Multiplexing (OTDM). Overcome the disadvantages of drive voltage too high, bad delicacy and needing add insulation to control transmitting-receipting. Also, this system may work at terribly abominable condition, author take some hardware design for anti-jamming.
Keywords Car Reversing Aid-System Ultrasonic Distance-Measuring microcontroller voice alarming system
目 次
1 绪论 1
1.1 课题的研究背景 1
1.2 倒车雷达的发展 1
1.3 课题研究的内容及意义 2
2 超声波理论基础 3
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