UHF RFID Indoor Localization Based on Phase Difference

Abstract

An indoor positioning system, with ultra-high frequency radio frequency identification based on phase difference (PD), is presented in this paper. Several groups of phases are obtained by setting reader’s different transmitting frequency to reduce the phase ambiguity. Two positioning algorithms are proposed with rough PDs, which are pattern matching based on PD correction and machine learning based on without PD correction. The experiments of two methods, in which machine learning gets a better positioning precision of 0.43 m, are also presented and discussed.

KEYWORDS:

• Indoor positioning
• Machine learning
• Pattern matching
• Phase difference

ACKNOWLEDGEMENT

This work was supported by the Key Field R&D Program Project of Guangdong Province, China (grant number 2020B0101050001), Science and Technology Project of Guangzhou, China (grant number 201804010464) and Scientific Research Project of Guangzhou University (grant number YK2020001).

Additional information

Funding

This work was supported by the Key Field R&D Program Project of Guangdong Province, China [grant number 2020B0101050001], Science and Technology Project of Guangzhou, China [grant number 201804010464] and Scientific Research Project of Guangzhou University [grant number YK2020001].

Notes on contributors

Yanhan Zeng

Yanhan Zeng received the BS and PhD degrees in electronic engineering from South China University of Technology, Guangzhou, China, in 2010 and Sun Yat-sen University, Guangzhou, China, in 2015, respectively. Since 2015, he has been an associate professor with School of Electronics and Communication Engineering, Guangzhou University, Guangzhou, China. His current research interests include power management IC, energy harvesting and RFID systems. Corresponding author. Email: [email protected]

Yuxing Liao

Yuxing Liao was born in Guangdong, China in 1993. He received his BC in electronic information engineering from Guangdong Polytechnic Normal University and his MS in electronics and communication engineering from Sun Yat-sen University. His research interests include RFID positioning algorithms and RFID positioning system design. Email: [email protected]

Xiheng Chen

Xiheng Chen was born in Guangdong, China in 1994. He received his BC in communications engineering from Sun Yat-sen University. His research interests include RFID positioning algorithms and RFID positioning system design. Email: [email protected]

Hong-zhou Tan

Hong-zhou Tan received the PhD degree in electronic engineering from the City University of Hong Kong, Hong Kong, and South China University of Technology, Guangzhou, China, in 1998. He was with several universities and IT companies in Hong Kong, Singapore, and Canada, from 1998 to 2004. Since 2004, he has been full professor with the Department of Information Science and Technology, Sun Yat-Sen University, Guangzhou. He served as the director of the Institute of Sysung-Etri, Guangzhou. His current research interests include signal integrity, RFID and IC design. Email: [email protected]