基于RFID载波相位的室内EKF定位算法

doi:10.11959/j.issn.1000-436x.2022048

通信学报 ›› 2022, Vol. 43 ›› Issue (3): 124-134.doi: 10.11959/j.issn.1000-436x.2022048

基于RFID载波相位的室内EKF定位算法

谢良波, 刘西西, 王勇, 周牧, 田增山

重庆邮电大学通信与信息工程学院，重庆 400065

修回日期:2022-02-16 出版日期:2022-03-25 发布日期:2022-03-01
作者简介:谢良波（1986- ），男，四川成都人，博士，重庆邮电大学副教授、硕士生导师，主要研究方向为射频识别技术、室内定位技术等
刘西西（1997- ），女，河南周口人，重庆邮电大学硕士生，主要研究方向为RFID定位
王勇（1987- ），男，云南昭通人，博士，重庆邮电大学副教授、硕士生导师，主要研究方向为室内定位、深度学习等
周牧（1984- ），男，重庆人，博士，重庆邮电大学教授、博士生导师，主要研究方向为无线定位、参数估计、机器学习等
田增山（1968- ），男，河南固始人，博士，重庆邮电大学教授、博士生导师，主要研究方向为蜂窝网无线定位、数据压缩、数据融合等
基金资助:
国家自然科学基金资助项目(61704015);国家自然科学基金资助项目(61771083);重庆市自然科学基金资助项目(cstc2019jcyj-msxmX0108);重庆市自然科学基金资助项目(cstc2020jcyj-msxmX0842)

Indoor EKF localization algorithm based on RFID carrier phase

Liangbo XIE, Xixi LIU, Yong WANG, Mu ZHOU, Zengshan TIAN

School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Revised:2022-02-16 Online:2022-03-25 Published:2022-03-01
Supported by:
The National Natural Science Foundation of China(61704015);The National Natural Science Foundation of China(61771083);Chongqing Natural Science Foundation Project(cstc2019jcyj-msxmX0108);Chongqing Natural Science Foundation Project(cstc2020jcyj-msxmX0842)

摘要/Abstract

摘要：

为解决现有超高频射频识别定位方法受室内环境干扰导致定位精度不高的问题，提出了一种基于跳频辅助的 RFID 载波相位室内扩展卡尔曼滤波（EKF）定位算法。利用跳频获取的虚拟大带宽进行距离粗估计以实现多径抑制，并通过多径抑制后的相位完成可靠双频点选择以及参数优化，最终采用 EKF 算法实现高精度快速定位。实验结果表明，所提算法平均定位误差为9.35 cm，定位解算实时性比传统的基于中国剩余定理（CRT）的解整周方法提高了近10倍。

关键词: 室内定位, 射频识别, 载波相位, 扩展卡尔曼滤波

Abstract:

In order to solve the problem of low localization accuracy caused by indoor environment interference in the existing UHF RFID localization methods, an indoor extended Kalman filter (EKF) localization algorithm based on frequency hopping assisted RFID carrier phase was proposed.The virtual large bandwidth obtained by frequency hopping was used for rough distance estimation to realize multipath suppression, and the reliable dual frequency point selection and parameter optimization were completed through the phase after multipath suppression.Finally, EKF algorithm was used to realize high-precision and fast localization.Experimental results show that the average localization error of the proposed algorithm is 9.35 cm, and the real-time performance of the localization solution is nearly 10 times higher than the traditional integer solution method based on Chinese remainder theorem (CRT).

Key words: indoor localization, RFID, carrier phase, EKF

中图分类号:

TN92

谢良波, 刘西西, 王勇, 周牧, 田增山. 基于RFID载波相位的室内EKF定位算法[J]. 通信学报, 2022, 43(3): 124-134.

Liangbo XIE, Xixi LIU, Yong WANG, Mu ZHOU, Zengshan TIAN. Indoor EKF localization algorithm based on RFID carrier phase[J]. Journal on Communications, 2022, 43(3): 124-134.

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设备	用途
英频杰R420	与标签建立通信，频点为924.125 MHz
无源标签	英频杰H47反射信号
USRP N210	共4台，一台用于发射780~900 MHz的跳频纯载波信号，3台用于接收标签反射信号
PC主机	控制发射和接收设备、处理实验数据
时钟源	（OctoClock-G CDA-2990）用于USRP发射端和接收端时钟源同步
射频天线	采用圆极化天线

基于RFID载波相位的室内EKF定位算法

Indoor EKF localization algorithm based on RFID carrier phase

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