Exploiting phase measurements of EPC Gen2 RFID tags

Author

Huiting, Jordy ; Flisijn, Hubert ; Kokkeler, A.B.J. ; Smit, Gerard J. M.

Author_Institution

Dept. of Electr. Eng., Math. & Comput. Sciencem, Univ. of Twente, Enschede, Netherlands

fYear

2013

fDate

4-5 Sept. 2013

Firstpage

1

Lastpage

6

Abstract

This paper presents a 2d localization system for UHF RFID tags. By measuring the phase between the transmitted continuous wave and received backscatter from the tag at different frequencies, it is possible to estimate the distance between the reader and tag. By determining distance estimates to three antennas it is possible to determine a location of a tag with the help of trilateration. The location of the antennas has to be known and any error in distance measurement influences the location estimate. Mainly to overcome the expected impact of the environment on the distance estimate, we opt for the use of reference tags and the K-Nearest Neighbor (KNN) algorithm to derive a location. An experiment is done and results are compared with an KNN algorithm based on received signal strength. Furthermore some experiments are done to verify the use of phase measurements for the detection of stationary tags in a portal application.

Keywords

UHF antennas; distance measurement; information retrieval; pattern classification; radiofrequency identification; telecommunication computing; 2D localization system; EPC Gen2 RFID tags; KNN algorithm; UHF RFID tags; distance measurement; k-nearest neighbor algorithm; received backscatter; reference tags; stationary tags; transmitted continuous wave; Calibration; RFID tags; UHF measurements;

fLanguage

English

Publisher

ieee

Conference_Titel

RFID-Technologies and Applications (RFID-TA), 2013 IEEE International Conference on

Conference_Location

Johor Bahru

Electronic_ISBN

978-1-4799-2114-0

Type

conf

DOI

10.1109/RFID-TA.2013.6694503

Filename

6694503