摘要
铁路标签分为机车标签和货车标签,两种标签被读写器发射的射频能量激活后,将连续不断、周而复始地返回标签中的数据帧给读写器,但两种标签返回的信号波形是不同的;利用机车标签帧头(特征值为0xE6D)与货车标签帧头(特征值为0x555555A)的不同,可转入不同的解码程序,达到自适应地识别出机车标签数据或货车标签数据;当列车运动时,货车标签返回给读写器的信号受多径效应的影响,出现衰落现象,使读写器不能正确识别标签数据,而且标签信号出现衰落的时间是随机的;利用同步特征信号可以采集到残缺的数据,并利用三帧残缺的数据拼接出一帧完整的标签数据。即使列车速度达到80km/h,也能正确识别出标签数据。
Railway tags can be divided into lorry tag and locomotive tag. Powered up by the RF energy of a reader, these two kinds of tag transmit the data in the tags to a reader endlessly and periodically. The waveforms type of two tags backscattered to a reader are different. Utilizing the different frame head between locomotive tag （characteristic value is 0xE6D） and lorry tag （characteristic value is 0x555555A）, the different decoding program can be carry, the lorry tag data or locomotive tag data can be identified accurately. When the lorry moves, the signals of a moving tag backscattered to a reader are faded under the influence of multi--path effect, so that the reader can＇ t identify the da- ta backscattered by the lorry tag, and the time when the faded signals happen is stochastic. Base on the character of signals, some remainder bits in a frame of data can be collected, and a complete frame of data can be spelled by utilizing three frames of the remainder data of the tag. With this arithmetic the lorry tags can be identified even though they move at 80km/h.
出处
《计算机测量与控制》
CSCD
北大核心
2011年第11期2807-2809,共3页
Computer Measurement &Control
关键词
单片机
射频识别
铁路标签
波形特征
残缺数据
多径效应
micro controller unit
RFID
railway tag
characteristic wave
remainder data
multi--path effect
