【作者】 张永健；

【导师】 张永强；

【作者基本信息】 河北工程大学 ， 计算机应用技术， 2008， 硕士

【摘要】 随着经济的发展,汽车市场不断壮大,私家车数量越来越多,但同时汽车被盗给人们带来了巨大的经济损失,汽车盗窃己成为世界一大公害。目前,微电子技术、全球定位系统和无线通信技术的不断发展,使得基于GPS和GPRS的网络式汽车防盗系统,成为汽车防盗领域研究的热点。本文首先研究了嵌入式GPS/GPRS车载定位系统基本理论,并且对其在国内外的研究和应用现状进行了分析。针对当前汽车防盗方式存在诸如误报率高、安装维护不便、声光污染和费用昂贵等缺点,提出以车载定位终端和用户为主、监控中心为补充的车辆定位跟踪策略:采用手机短消息的方式,车载终端监测车体状态并向车主发送报警信息,用户也可以向车载终端发送控制消息;根据用户需求,建立车载终端和监控中心的通信连接,对车辆进行实时定位和跟踪。基于以上思想,本文以嵌入式ARM9微处理器、GPS模块、GPRS模块和加速度传感器等硬件单元为基础,设计了嵌入式车载定位系统的硬件结构方案,详细介绍了系统的硬件电路设计过程。采用嵌入式Linux操作系统的实时特性实现了多路实时数据采集,利用Linux的多线程技术解决了GPS定位数据处理、车体状态检测和数据通信等多个任务的并发执行。最后实现了软件系统的裁剪和移植。试验证明本系统用于车辆状态查询和定位跟踪时,具有通信费用低、操作方便等优点,较好地达到了预定的目标要求。更多还原

【Abstract】 While people owning their private cars nowadays, they will also be subject to high risks if they have their cars been stolen, thus along with huge economical losses. Cars-stolen has become a major public jeopardize across the world. At present, the researches on car anti-theft system based on GPS/GPRS and network have become a hot pot because of the increasing development of micro-electronic technology, GPS and wireless communications technology.Firstly, the basic theory of embedded GPS/GPRS vehicle positioning system, and its research and application conditions in home and foreign were detailedly expounded. In view of the current car anti-theft device’s shortcomings such as: high rate of false alarms, installation and maintenance inconvenience, sound and light pollution and high cost, then proposed a vehicle positioning and tracking strategy that mainly composed by the vehicle positioning terminals and the vehicle owner, and supplemented by monitoring center. In this strategy, vehicle positioning terminals and the vehicle owner exchange the alarm and control information by using short message. According to the vehicle owner’s needs, established the data communication between the vehicle terminal and the monitoring center, and put real-time vehicle positioning and tracking in practice.Based on the above ideas, this paper designed the hardware framework based on the ARM9 microprocessor, GPS module, GPRS module and acceleration sensor, and elaborated on the system’s hardware circuit design process. The paper presents an application of real time and multithread characteristic of embedded Linux. It briefly introduced the method and the program of real time sampling from multi-sensors, and resolved the multi-mask running concurrent. Finally configurate the software systems and transplanting them to the hardware system based on S3C2410A.Case study have proved out that this vehicle terminal is suitable for inquire the vehicle status, positioning and tracking, and achieve predetermined requirements because of low-cost of communication and easy to operate.更多还原