毕业设计-基于单片机的超声波倒车雷达系统的设计.doc

超声波倒车雷达系统的设计 工 学 部 工学一部 专 业 班 级 学 号 姓 名 指导教师 负责教师 沈阳航空工业学院2009年月摘 要 倒车雷达是针对日益拥挤的道路交通状况、以及在停车场、车库、街道等比较狭窄区域，避免车与车，车与人以及车与墙壁等障碍物发生碰撞，摩擦而出现的一种着眼于倒车防护的汽车防撞系统。16位单片机SPCE061A为核心，分别控制三个超声波模块，每一个超声波测距模块都被设定面向不同方向，以探测不同方向的障碍物。本系统采用单片机控制时间计数和超声波的发射和接收，利用超声波回波的间隔时间，得出实测距离。结果表明该系统具有结构简单、工作可靠、精度高等特点。关键词：SPCE061A；；；LCDAbstract The back-draft radar is aims at day by day the crowded road traffic condition, as well as in the parking lot, the garage, the street and so on the quite narrow region, avoids automobile and automobile, obstacle and so on Automobile and person as well as vehicle and wall has the collision, one kind which the friction appears focuses to the back-draft protection automobile collision avoidance system.As well as the high-tech products gradually integrated into the daily life, the Parking Distance Control system has undergone tremendous changes. The Parking Distance Control system has been given the new direction of the research and significance by the developed of the Bionics, Acoustic, etc. This article describes a Parking Distance Control system which contains three ultrasonic ranging modules and the results can be pronounced in real-time. The three ultrasonic ranging modules are set to three different directions to detect the roadblock .This three modules are control by the system which is based on sunplus SPCE061A microprocessor. The time counting and both the transmitting and receiving of the ultrasonic wave are controlled by the microprocessor. The measured distance can be calculated and displayed by the echo time by the code. The features of the simple hardware, stable operation and high precision are incarnated in the proposed system. Keywords: SPCE061A microprocessor; ultrasonic ranging; voice prompts; LCD display 目 录 1 绪 论 1 1.1 课题背景 1 1.1.1 倒车雷达的发展历史 1 1.1.2 倒车雷达的发展方向与展望 3 1.2 课题任务及要求 3 1.3 课题的主要内容及目的 4 2 超声波倒车雷达系统的总体方案论证 5 2.1 超声波测距PWM信号方案论证 5 2.1.1 超声波测距PWM信号硬件实施方案 5 2.1.2 超声波测距PWM信号软件实施方案 6 2.1.3 超声波测距PWM信号实施方案比较