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Multi reader/multi-tag SAW RFID systems combining tagging, sensing, and ranging for industrial applications

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4 Author(s)
Stelzer, A. ; Inst. for Commun. & Inf. Eng., Johannes Kepler Univ., Linz ; Scheiblhofer, S. ; Schuster, S. ; Brandl, M.

In this paper hardware and software aspects for the precise wireless interrogation of SAW delay line sensors by means of frequency-modulated continuous-wave (CW) interrogators are summarized. The generation of the interrogation signal as well as concepts for the frontend are treated. Advanced concepts, namely switched variants of CW based interrogators are introduced. The signal model and the appropriate maximum likelihood estimators (MLEs) for the unknown parameters are derived, as well as achievable evaluation accuracies by means of the Cramer-Rao bounds stated. Finally, a multi-antenna reader system is used for SAW interrogation by means of digital beamforming (DBF). Beside the basic DBF principles, measurement results of the interrogation of spatially separated tags will be shown.

Published in:
Frequency Control Symposium, 2008 IEEE International

Date of Conference: 19-21 May 2008

Page(s):
263 - 272
ISSN :
1075-6787
E-ISBN :
978-1-4244-1795-7
Print ISBN:
978-1-4244-1794-0
INSPEC Accession Number:
10204895
Conference Location :
Honolulu, HI
Digital Object Identifier :
10.1109/FREQ.2008.4623002
Product Type:
Conference Publications

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