《毕业论文：基于AT89C52单片机倒车防撞报警系统设计》.doc

毕业设计说明书 毕业生姓名 ： 专业 ： 学号 ： 指导教师 ： 所属系（部） ： 二〇一〇年六月  摘 要 本文设计了一种汽车倒车雷达预警系统。该系统在常见的汽车倒车预警装置的基础上采用计算机控制技术和超声波测距技术，通过显示障碍物与汽车的距离并根据其距离远近实时发出报警，解除了驾驶员泊车和起动车辆时前后左右探视所引起的困扰，提高了驾驶安全性。 本文在设计汽车倒车雷达预警系统过程中，运用理论分析、电路设计等手段，完成了倒车雷达预警系统硬件和软件的设计。 本文在查阅、分析国内外倒车雷达系统相关技术的基础上，结合必威体育精装版研究成果，对基于超声波测距的倒车雷达预警系统的研制进行了深入探讨。该系统分为测距模块、系统控制模块和显示报警模块，并分别对其进行方案分析，构建了倒车雷达预警系统的系统构架和设计方案；在硬件电路中，详细阐述了运用单片机技术实现的可视倒车雷达预警系统的测距实现原理，分析了以AT89C52单片机为主控单元的系统硬件和软件设计，并对该系统进行了误差分析，给出了本系统的稳定性指标。 试验结果显示，该系统对室内有限距离的距离测量具有较高的精度，实现了倒车提示和距离报警功能，同时保证系统的可靠性和可行性。 关键词：倒车雷达；超声波测距 ABSTRACT The thesis introduces a kind of Car Reversing Aid-System in detail.The system adopted the technology of computer controll and Ultrasonic Distance-Measurement based on the currently Car Reversing Aid-System.The system alarmed in time through displaying the distances between obstacles and cars.It soluted the puzzle problem because the drivers looked around through the mirrors when they stopped or started the vehicle.The system would greatly solve the difficulties and meanwhile improve the driving safety. In this thesis analysis in theory,design of electronic circuit and experimental investigation on real time simulation system are employed to carry out the research.It realized the design of hardware and software. The thesis mainly analyzed deeply the research on the design of Car Reversing Aid.System.Firstly,according to the latest researches in domestic and foreign countries.the system consisted of the Distanee-Measurgment Module,Control Module mad Display or Alarm Module.The paper discussed the scheme of three module and selected the best system scheme in the paper.Secondly,it presented the theory and characters of Ultrasonic Distance-Measurement and analyzed in detail design of the hardware and sottware based on the AT89C52 mierocontroller.Thirdly the fuzzy control algorithm is proposed,the simulation is introduced into the system.At last,through the experiment and eITor analysis,it proved the stability of the system. To monitor it