Analysis of an UHF RFID System for interior position sensing

Conference: RFID SysTech 2008 - 4th European Workshop on RFID Systems and Technologies
06/10/2008 - 06/11/2008 at Freiburg, Germany

Proceedings: RFID SysTech 2008

Pages: 5Language: englishTyp: PDF

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Schönegger, Christoph; Stadlmann, Burkhard (Fachhochschule FH Wels, Stelzhamerstraße 23, A-4600 Wels, Austria)
Wernle, Michael E. (Meshed Systems GmbH, Alte Landstrasse 21, D-85521 Ottobrunn, Germany)

This paper presents a new concept for determining the location of an RFID-tag without any additional hardware. For this positioning system standard RFID components within the UHF range are used. The measurement is based on a location algorithm which makes use of the RSSI value of the UHF reader. The RSSI value is the return signal strength indicator and, as it is shown in the paper in hand, this signal correlates to the distance between the RFID tag and the antenna of the reader. This positioning system is especially useful indoors, where other positioning systems may not work. For this reason it could prove very useful in various logistics applications. The maximum distance from antenna to the tag is approximately between 0.5 m and 3 m. To this end a special algorithm is used to obtain stable calculation results. A minimum of two antennas is needed to get a two-dimensional location.