TY - GEN
T1 - Multi reader/multi-tag SAW RFID systems combining tagging, sensing, and ranging for industrial applications
AU - Stelzer, Andreas
AU - Scheiblhofer, Stefan
AU - Schuster, Stefan
AU - Klaffenböck, Maria Anneliese
PY - 2008/5
Y1 - 2008/5
N2 - 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.
AB - 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.
UR - http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4623002
U2 - 10.1109/FREQ.2008.4623002
DO - 10.1109/FREQ.2008.4623002
M3 - Conference proceedings
SN - 9781424417957
T3 - Proceedings of the IEEE International Frequency Control Symposium
SP - 263
EP - 272
BT - Frequency Control Symposium, 2008 IEEE International
ER -