摘要：在电信中，应答器可以是两种类型的设备之一。 在空中导航或射频识别中，飞行应答器是飞机中的自动收发器，其响应于询问的接收信号发出编码的识别信号。 在通信卫星中，卫星转发器通常通过卫星地面站的上行链路频率范围接收信号，放大它们，并将它们以不同的一组下行链路频率重新发射到地球上的接收机，通常不改变接收信号或信号。但是在日益发展的今天，应答器广泛的应用于客运专线和高速列车线路上．应答器在欧洲已经应用多年，是高速列车可靠、有效的信息传输工具．在国内，应答器借鉴国外技术，尚处在研究、革新阶段，在CTCS标准中，点式应答器作为在特定地点为列车定位和传递地面信息的关键和基础而存在，具有不可替代的作用。本课题的内容也主要从应答器设备的功能、组成和工作原理出发，通过基于单片机芯片AT89S51与MF RC500的电路与软件流程设计，以及对应答器中报文编解码系统的研究来从中了解应答器的主要原理和功效流程。并且在设计中，主要运用MS232电平转换器、看门狗复位程序以及RFID技术，从而使整个设计完整合理安全。硬件部分可以使用软件来画出框图，并在此基础上试着搭建自己的系统电路，把各个功能模块组成一个系统，继而完成设计。目前，应答器在国内并没有成品和相应的测试环境，也有许多棘手的问题等待去解决。

关键词：应答器；列车控制系统； AT89S51；MF RC500

Design of microcontroller-based vehicle transponder

Abstract：In telecommunications, transponders can be one of two types of devices. In air navigation or radio frequency identification, the flight responder is an automatic transceiver in the aircraft, which responds to the received signal sent by the query and sends out the coded recognition signal. In communication satellites, satellite transponders usually receive signals through the uplink frequency range of satellite ground stations, magnify them, and retransmit them to the earth's receivers on a different set of downlink frequencies, usually without changing the received signals or signals. But in the day of growing development,, the transponder device has become important foundation equipment for high-speed train control system, and it is also the new equipment which was introduced by the signal system. Many of them include a high-tech; including radio frequency identification (RFID).The topics research the 

function, composition and working principle of the transponder device.Then through the design of hardware circuitry and software process, which based on the singlechip AT89S51 and MF RC500, weunderstand the main principles and processes of transponder from the research of message encoding and decoding system.And in the design, I mainly use the MS232 level converter; the watchdog reset procedures and RFID technology to entire the whole design completely, reasonablyand safely. In the part of the hardware,we can use Protel to draw the schematic of the hardware connection.I try to build my own systemcircuit on this basis and to compose a system with these various functional modules.Then I will complete the design.While transponder is still in its infancy in China's research and application, so the project has great research and development space.

Keywords: transponde

目录

Keywords: transponde 1

1 绪论 3

1.1 课题的目的与意义 3

1.2 应答器在国外的历史、发展及工作状态 3

1.3 应答器在国内的历史、现状及发展前景 4

2 应答器设备的原理及功能