电子公交站牌发射模块设计.doc

目 录 摘要 I Abstract II 引言 1 1 方案论证 1 1.1 通信网络 1 1.2无线传输网络的对比 1 1.2.1 蓝牙技术 2 1.2.2 全球移动通信(GSM) 2 1.2.3 ZigBee技术 2 1.2.4 通用分组无线业务(GPRS) 3 2 理论基础 3 2.1 ZigBee协议解析 3 2.1.1 ZigBee技术的体系结构 3 2.1.2 ZigBee技术的网络拓扑结构 4 2.1.3 ZigBee技术优势 5 2.2 无线射频识别技术 6 2.3 串口通信的基本概念 7 2.3.1 串口通信 7 2.3.2 串行通信工作模式 7 2.3.3 异步传输与同步传输 8 3 电子公交站牌系统设计 10 3.1 系统运行流程 10 3.2 模块间传输的信息 11 3.3 公交站台模块 12 3.3.1 电子站牌 12 3.3.2 对车载发送信息的接收 13 3.3.3 站台信息更新 14 3.4 调度中心模块 14 3.4.1 计算机系统 14 3.4.2 公交车辆运行基础信息数据库 14 4 发射模块设计 16 4.1 通信参数 16 4.1.1 数据的传输速度 17 4.1.2 数据的传送单位 17 4.1.3 起始位与停止位 17 4.1.4 校验位 17 4.2 通信界面 18 4.3 信息收发 19 4.4 数据传输过程的误码排除 20 4.5 握手信号 21 总结 23 致谢 24 参考文献 25 译文 26 摘要 电子公交站牌是对以往公交体系的一种革新，它利用现有的无线网络，实现了移动车载与公交站台、公交站台与调度中心间的相互通信，从而达到对公交车的运行管理和车辆调度。基于IEEE802.15.4无线网络收Abstract Electronic bus station Logo is an innovative to past public transport system, which uses existing wireless network to have realized the communication between the mobile vehicle and bus stations, bus stations and inter-control center, so that the operation of bus management and vehicle scheduling have been realized, also the vehicle conditions operator can be acquired in real time, which reflect better waiting service. Transmitter module is mainly to realize the communication between mobile vehicle and fixed-mobile bus platform. Platform and vehicle are installed IEEE802.15.4-based wireless data transmission network to send and receive data terminal equipment, terminal equipment in the vehicle store the vehicle information, when the car is running into the scope of ZigBee communication network, vehicle information will be transmitted to the bus station through ZigBee wireless transmission network, bus station in the added information on the site and then send it to control center by using GPRS network, control center will process information after receiving information , and then feedback it to the bus station. In the site, the location of vehicle can be shown through electronic bus stop in real-time. Keywords：Electronic bus stati