Phase-Based UHF RFID Tracking With Nonlinear Kalman Filtering and Smoothing

Author

Särkkä, Simo ; Viikari, Ville V. ; Huusko, Miika ; Jaakkola, Kaarle

Author_Institution

Aalto Univ., Espoo, Finland

Volume

12

Issue

5

fYear

2012

fDate

5/1/2012 12:00:00 AM

Firstpage

904

Lastpage

910

Abstract

In this paper, we present an UHF RFID location tracking system, which is based on measuring the phases of back scattered signals from RFID tag using multiple spatially distributed antennas at a single carrier frequency. The wavelength ambiguity of the phase measurements is resolved by using the extended Kalman filter (EKF) and the Rauch-Tung-Striebel (RTS) smoother, where the state includes the position, velocity and the phase offsets of antennas. The performance of the method is experimentally verified at 890 MHz using a commercially available RFID reader.

Keywords

Kalman filters; UHF antennas; radiofrequency identification; smoothing methods; RFID reader; RFID tag; Rauch-Tung-Striebel smoother; UHF RFID location tracking system; back scattered signals; extended Kalman filter; frequency 890 MHz; multiple spatially distributed antennas; nonlinear Kalman filtering; phase measurements; phase-based UHF RFID tracking; single carrier frequency; wavelength ambiguity; Antenna measurements; Antennas; Phase measurement; Radar tracking; Radiofrequency identification; Trajectory; Extended Kalman filter; RFID; RTS smoother; tracking; transponders; wireless sensors;

fLanguage

English

Journal_Title

Sensors Journal, IEEE

Publisher

ieee

ISSN

1530-437X

Type

jour

DOI

10.1109/JSEN.2011.2164062

Filename

5978173