基于嵌入式可视倒车雷达系统的设计与实现

【作者】 张斌；

【导师】 李洪亮；

【作者基本信息】 曲阜师范大学 ， 控制理论与控制工程， 2009， 硕士

【摘要】 随着电子技术、嵌入式系统技术、汽车工业的快速发展,汽车工业的自动化、信息化水平不断提高,嵌入式系统被越来越广泛的应用在汽车行业中。计算机技术、通信技术和控制技术的进步,嵌入式技术的不断提高,选择一个合适的嵌入式操作系统将显著提高系统的性能和开发速度,为工业的现代化,信息化提供一个支持平台。Linux操作系统的内核高效稳定、可移植性强,再加上其公开源代码、资料丰富的特点,因此在嵌入式领域得到了广泛应用。针对汽车行业中倒车雷达现状,本文提出了一种以ARM9处理器ARM920T和Linux操作系统为软硬件平台的视频数据采集方案、LCD液晶显示模块、超声波发射接收装置、语音报警模块等多模块设计,完成了对倒车系统复杂情况的判断、测距、视频采集、语音报警等功能。从测试的准确行,可观性、稳定性上对可视倒车雷达系统的组成取得了新的突破。本系统采用超声波换能器产生超声波,当超声波碰到障碍物后因阻挡而被反射,系统通过CSB40R接收,然后通过超声波的发射和接收之间的时间差而测出距离;测距的同时运用USB接口的摄像头捕获车后障碍物的情况,司机可以直观的通过LCD液晶显示器看到车后的状况;通过语音报警系统通知司机具体的距离及危险程度。该系统的有效运用可使我们更好的避免交通事故,有效的利用高端科技为日常生活服务。系统在研制过程中牢牢把握住产品的实用性及易于实现的原则,在硬件方面选用了市面上常用的硬件,对系统的实现方式和关键技术进行了多次的验证和改进。大量实践表明,该系统性能可靠,测试准确,是完善车载系统实现无故障倒车的有效技术。更多还原

【Abstract】 With the development of the technology of the electronic,auto,embed and information in recent years,the embed system has been widely applied in each field.Thanks to the progress of the computer,communication and automation,especially the improvement of the embed technology,selecting a embed operating system will be a very effective thing that will improve the capability and the empolder rate,which will supply a support platform for the modernization and informatization of the industry.In connection with the current situation of reversing radar,the paper puts forward a design of modules which is based on ARM9 processor named ARM920T and the Linux control system, which has all the functions including:data gather module of vidio,LCD module,ultrasonic send/incept module,alarm module of sound etc.The system can complete the functions of judgement,measure distance,gather video,audio alert and so on.The reversing radar breaks through in terms of veracity、observabitity、stability.In order to produce the ultrasound the system adopts the device of ultrasonic transducer which has the feature of echoing when the ultrasonic touching the barrier.The reflected wave will be taken over by CSB40R,then ARM can test the time from sending to receiving,from which the controller can measure the distance from barrier to car.At the same time the pickup camera captures the scene of the back of the car based on the serial data of USB transfer;and then the driver can watch the states of the back situation through the LCD.according to the judgement the controller can also alarm the driver of the distance from the barrier to the car with the dangerous circumstances.If the controller system is used effectively,it can better serve our daly life,for example it can reduce the traffic accidents drastically.The practicability and the actualization are emphasized in the research course.With respect to hardwares,we choose the common ones.And we also have done much work in improving and verifying the gordian technique.The practical results show that the reversing radar system with accuracy test and dependable performance will play an important role in reversing without barrier.更多还原