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Design of Real Time Location System for UHF RFID

机译:UHF RFID实时定位系统的设计

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摘要

Radio frequency identification (RFID) technology for Real Time Location System (RTLS) is one of the current research focus. This paper applies RFID technology, TDOA location algorithm and CDMA mechanism and designs the location command format and response mode based on the 18000-6C protocol. Based on the above mentioned, we complete a prototype design, including RFID tags and reader. The reader sends customized location command. Then tags will respond to command, generate configurable gold code and send it back to the reader. Because gold codes of different tags are orthogonal or quasi-orthogonal, the reader can receive echoes of multiple tags at the same time, do correlation respectively and locate tags by time difference of arrival (TDOA) simultaneously. Measured results show that the time difference accuracy is within 150ps by using correlation method. Therefore, the prototype has good function and performance, which meets the requirements of design.
机译:实时定位系统(RTLS)的射频识别(RFID)技术是当前的研究重点之一。本文采用RFID技术,TDOA定位算法和CDMA机制,并基于18000-6C协议设计了定位命令格式和响应模式。基于以上所述,我们完成了原型设计,包括RFID标签和读取器。阅读器发送自定义的位置命令。然后标签将响应命令,生成可配置的金码并将其发送回阅读器。由于不同标签的金码是正交的或准正交的,因此阅读器可以同时接收多个标签的回波,分别进行相关,并同时通过到达时间差(TDOA)来定位标签。测量结果表明,采用相关法时差精度在150ps以内。因此,该原型具有良好的功能和性能,可以满足设计要求。

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