【作者】 金辉；

【导师】 谢胜利；

【作者基本信息】 华南理工大学 ， 通信与信息系统， 2011， 硕士

【摘要】 随着我国铁路线路的不断提速,列车临时限速的安全性已经成为列车控制系统中的一个重要问题。传统的临时限速依靠了司机人工瞭望限速标示牌,这种方式存在比较大的安全隐患,不利于列车的安全运输。由于射频识别技术具有识别速度快,识别距离远,可适应相对恶劣环境等明显优点,因此非常适合应用于列车临时限速系统中。利用电子标签作为限速信息载体,利用车载设备与之通信,以获取限速信息,并进行相关控制,以及利用基于射频识别技术的便携终端进行限速信息的地面维护不失为一种很好的临时限速解决方案。在采用电子标签作为信息载体的临时限速系统中,由于地面电子标签根据已有的传统限速标示分为多种类型,容易产生混淆,导致限速标签的错误摆放,给行车带来潜在的危害。同时,为满足对已安装电子标签的日常维护,结合实际应用环境,临时限速便携终端成为临时限速系统中必不可少的组成部分之一,并且需要提供一种有效的维护方法。维护工作包括利用便携终端布控,检测,解除和修改限速标签。本文针对上述问题对所选课题进行了深入研究和探讨。本文的目的是设计一款基于射频识别和嵌入式技术的临时限速便携终端,并进行相关的技术研究。基于该目的,本课题的主要研究内容为:研究临时限速便携终端的工作流程,硬件组成和软件设计;研究临时限速后台系统的设计及其与终端的通信协议;研究基于动态帧时隙ALOHA的防碰撞算法及系统低功耗技术。更多还原

【Abstract】 With the constant acceleration of railway line, the safety of Temporary Speed Restriction has become a very important issue in train control system. The method which relied on artificial outlook of drivers to reach Temporary Speed Restriction information in traditional way has large potential safety problems, and it is not conducive to safe transport of train. There are many obvious advantages of Radio Frequency Identification technology like high recognition speed, long recognition distance, can be adapted to relatively harsh environment and so on, as a result of this, it is great suitable for the applications of Temporary Speed Restriction. It is a good solution that using RFID tag as information carrier of Temporary Speed Restriction information, using car equipment to communicate with RFID tag, as well as using portable terminal based on RFID technology to maintain RFID tag. Tag is dispatched on the railway, and when it is been past by train, the train automatically read, parsed and do some associate control.When using RFID tag in a Temporary Speed Restriction system, because of the ground RFID tag has been divided into several types according to the tradition of the speed limit, this may lead to confusion, Speed Restriction tag misplaced, and bring traffic Potential hazards. At the same time, in order to meet the daily maintenance of installed electronic tags, combined with the practical application environment, a portable, energy-efficient terminal become one necessary part of Temporary Speed System. And we need some maintenance methods. The maintenance work include dispatch, detect, remove and modify RFID tags.Based on those problems mentioned above, we have researched this topic deeply, in expectation of providing supplementation of technique on Temporary Speed Restriction and promoting the application of RFID techonology. The purpose of this paper is to design a Temporary Speed Restriction Portable Terminal Based on RFID and Embedded Technology. For this reason, this paper has concentrated on the following topics: research and design workflow, hardware and software of Portable Terminal; research Temporary Speed Restriction Background system and its communication protocol with Terminal; research the anti-collision algorithm simulation based on the dynamic framed slot ALOHA algorithm; research the low power technology.更多还原