一种基于相控阵列天线的超高频射频识别相对定位方法  

A relative positioning method of UHF RFID based on phased array antenna

作　　者：史伟光[1] 刘鹏辉 SHI Weiguang;LIU Penghui(School of Electronics and Information Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学电子与信息工程学院,天津300387

出　　处：《天津工业大学学报》2024年第5期82-88,共7页Journal of Tiangong University

基　　金：天津市自然科学基金青年项目(19JCQNJC03300);天津市研究生科研创新项目(人工智能专项)(2020YJSZXS29)。

摘　　要：针对已有相对定位方法存在环境依赖程度大、定位精度低等问题,提出一种基于相控阵天线的超高频(UHF)射频识别(RFID)相对定位方法,该方法通过调节相控阵天线的激励参数来改变天线的辐射方向,以获取目标标签的收信场强轮廓,有效降低了系统对环境和场地的依赖程度;同时,提出一种基于轮廓陡峭程度的相对位置估计方法,该方法首先利用轮廓最高点的时间戳信息将目标标签分为两组,然后计算每一组标签的整体轮廓陡峭程度进而估计其相对位置。仿真结果表明:相比于传统相对定位方法,所提相对定位方法能够有效提高定位精度,降低排序偏差;在信噪比为20~30 dB时,性能提高了7.7%~21.6%。上述结果证实了本文方法的有效性。Aiming at the problems of the existing relative positioning methods,such as high environment dependence and low positioning accuracy,a phased array antenna based ultra high frequency radio frequency identification relative positioning method is proposed.By adjusting the excitation parameters of the phased array antenna,the radiation direction of the antenna is changed to obtain the received field strength profile of the target tag,which effectively reduces the system′s dependence on the environment and venue.Meanwhile,a relative position estimation method based on the steepness of the contour is proposed.The method first divides the targets into two groups based on the timestamp information of the highest point of the contour,and then calculates the overall contour steepness of each group of labels for sorting.The simulation results show that compared with the traditional relative positioning method,the proposed relative positioning method can effectively improve the positioning accuracy and reduce the sorting deviation.When the signal-to-noise ratio is 20-30 dB,the performance is improved by 7.7%-21.6%.The above results confirm the effectiveness of the method prepare in this paper.

关 键 词：射频识别 相对定位 相控阵天线 定位精度 超高频 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]