利用单片机的捕获功能自动识别铁路RFID标签数据

摘要

After the railway tags divided into lorry tag and locomotive tag are activated by RF energy from reader, the data frames in the tags are reterned to a reader endlessly and periodically. The tag signal demodulated by the reader is transmitted to MCU, which employs the edge capture function to decode the data of tag from the circuit of demodulation, Sinse the locomotive tags, lorry tags and their data waveforms are all different, they can be identified accurately according to their own signal features. Therefore, wherever the locomotive tag is in a train, the error recognition or missing recognition can not occur.%铁路标签分为机车标签和货车标签.2种标签被阅读器发射的射频能量激活后,将连续不断、周而复始返回标签中的数据帧发送给阅读器.阅读器将标签信号解调后送给单片机,单片机采用边沿捕获功能完成解码.机车标签帧头和货车标签帧头,以及它们的数据波形均是不相同的,正是利用它们各自信号的特征,可以自适应地识别出是机车标签还是货车标签,这样无论机车处于列车的什么位置,均不会出现误识别或漏识别现象.