无线射频识别装置的设计

为了提高超市商品的识别效率，针对超市中不能自动快速识别多个条形码的问题，采用电子标签来代替条形码，设计了一种无线射频识别装置．通过无线射频识别通道、阅读器勘误（中间层）以及自动计费系统来实现超市中商品自动识别的功能．以凌阳61单片机作为主控器，配合常用编码解码芯片PT2262／2272实现阅读器对应答器的识别，编码数据的收发控制，以及信息的存储读写功能；采用模拟开关TS5A3166完成负载调制；使用变压器耦合方式较好地实现了应答器和阅读器之间的数据传输和能量交换．该无线识别装置实现了阅读器对应答器预置信息的识别，实现了较远距离的无线能量传输和极低误码率的二进制数码传输，及对应答器存储芯片的读写以及存储器内容显示的功能．结果表明：每250ms便可从射频标签中读出商品的相关数据，误码率极低，阅读器的收发距离大于20cm．

Design of radio frequency identification devices

To solve the problems that multiple barcodes can not be identified automatically with high speed and to improve the efficiency of commodity identification, electronic label was used to replace the bar code. A kind of radio frequency identification device was designed to realize the automatic recognition of supermarket goods through the radio frequency identification channel, reader differential （middle layer） and automatic billing system. The SUNPLUS 61 microchips was used as the controller, and the coding and de-coding chip PT2262/2272 was used to realize the identification of the reading machine to the transponder, the transmit-receive controlling of the coding data, and the writing, reading and storing of the information; the analog switch TS5A3166 was used to finish load modulation; transformer coupled mode was used to realize the data transmission and energy exchanging between the transponder and the transceiver well. The reader to transponder preset information recognition, a remote wireless energy transmission and low error rate of binary digital transmission were realized in the wireless identification device. The obtained results indicate that the related data about goods is read from radio frequency tags every 250 ms, the error rate is extremely low, the transit-receive distance of the reader is more than 20 cm.