应用RFID技术实现地铁列车精确定位的研究

本文提出了一种基于射频识别RFID技术的地铁列车跟踪与定位系统,用以实时、精确、高效的确定地铁列车在线路上的位置,并在综合站场表示图上展现出来,为地铁调度系统提供数据支持。采用的RFID(射频识别)系统,使用铁路专用RFID无线识别阅读器,有极可靠的设计、极佳的性能和极灵活的用户适应性。能识别0-6m的物体,能准确识别时速达400公里的车辆,且极可靠,误读率几乎为零,能满足地铁方面将阅读器固定在轨道上或列车上的要求。系统的工作原理:将无源标签每隔一定间隔(如1.5m)依次固定安放在列车运行线路上,标签读写器及通讯设备安装于车上,并联至车载微机。当列车通过一枚定位标签时,车载读写装置(射频主动天线RF-Active Antennas,安装在列车底部)读取标签内的精确位置信息数据,从而实现精确定位(精度0.5m)。通过对地铁列车的跟踪定位,提高了地铁运行的自动化水平,对地铁运输具有重大意义。

This text put forward a kind of subway railroad train that identifies technique RFID （Radio Frequency Identification） according to the radio frequency to follow the system with fixed position technique. It uses to follow and make sure the position of subway railroad train＇s on-line road. The combining adjusts one degree system and provides data support for subway railroad train.The RFID system of this text adoption, uses railroad appropriation the RFID wireless identify a reader, there are the most dependable design, the best function and the most vivid customer＇s adaptability.It can identify the object of 0-6 meters, the ability is accurate to identify speed per hour to reach to 400 kilometers of vehicles, and the most dependable, the mistake reads rate almost is zero, can satisfy subway railroad train reader fixed]y in the request on the railroad train.The work principle of system：Will have no source label to separate a sleepers to one by one in order fix to put on the sleepers each time, the label reads and writes machine and communication equipments to install on the subway railroad train and merge into subway railroad train calculator.When local iron railroad train passed a fixed position label, read and write device （radio frequency active antenna RF-Active Antennas, install at subway railroad train bottom） to read the accurate position information inside the label data, carry out a precision fixed position thus.（low speed is smaller than lcm）.Pass the on the trail of fixed position to the subway railroad train, raised the automation level that the subway railroad train circulates, have great significance to the subway conveyance.