Multi-Frequency Continuous-Wave Radar Approach to Ranging in Passive UHF RFID

Daniel Arnitz; Klaus Witrisal; Ulrich Mühlmann

doi:10.1109/TMTT.2009.2017320

Multi-Frequency Continuous-Wave Radar Approach to Ranging in Passive UHF RFID

Daniel Arnitz, Klaus Witrisal, Ulrich Mühlmann

Institute of Signal Processing and Speech Communication (4420)

Research output: Contribution to journal › Article › peer-review

Abstract

In this paper, we present the extension of a recently published two-frequency continuous-wave (CW) ultra-high-frequency RF identification ranging technique to multiple carriers. The proposed system concept relies on exact phase information; hence, the passive tag cannot be accurately modeled as a frequency-flat linear device. A linearized model of the tag's reflection coefficient is devised to bridge the gap between the nonlinear reality and the linear CW radar theory. Estimation error bounds are derived and effects caused by noise and multipath propagation are analyzed in detail. It has been found that systematic errors introduced by the tag's reflection characteristic cannot be compensated by using multiple carriers due to large variations caused by detuning. Nonetheless the system, while being vulnerable to multipath propagation effects, still performs well under line-of-sight conditions; mean average errors below 15% of the true distance are possible in typical fading environments..
Published in: IEEE Transactions on Microwave Theory and Techniques ( Volume: 57, Issue: 5, May 2

Original language	English
Pages (from-to)	1398-1405
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	57
Issue number	5
DOIs	https://doi.org/10.1109/TMTT.2009.2017320
Publication status	Published - 2009

Treatment code (Nähere Zuordnung)

Basic - Fundamental (Grundlagenforschung)

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10.1109/TMTT.2009.2017320

PARIS - Position Aware RFID Systems
Kubin, G., Arnitz, D. & Witrisal, K.
1/08/07 → 31/12/10
Project: Research project
Wireless Communications
Dizdarevic, V., Tampubolon Baringbing, J. W., Arnitz, D., Gigl, T., Meissner, P., Alemseged Demessie, Y., Witrisal, K., Krall, C. & Geiger, B.
1/07/03 → 31/12/23
Project: Research area

Cite this

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title = "Multi-Frequency Continuous-Wave Radar Approach to Ranging in Passive UHF RFID",

abstract = "In this paper, we present the extension of a recently published two-frequency continuous-wave (CW) ultra-high-frequency RF identification ranging technique to multiple carriers. The proposed system concept relies on exact phase information; hence, the passive tag cannot be accurately modeled as a frequency-flat linear device. A linearized model of the tag's reflection coefficient is devised to bridge the gap between the nonlinear reality and the linear CW radar theory. Estimation error bounds are derived and effects caused by noise and multipath propagation are analyzed in detail. It has been found that systematic errors introduced by the tag's reflection characteristic cannot be compensated by using multiple carriers due to large variations caused by detuning. Nonetheless the system, while being vulnerable to multipath propagation effects, still performs well under line-of-sight conditions; mean average errors below 15% of the true distance are possible in typical fading environments..Published in: IEEE Transactions on Microwave Theory and Techniques ( Volume: 57, Issue: 5, May 2",

author = "Daniel Arnitz and Klaus Witrisal and Ulrich M{\"u}hlmann",

year = "2009",

doi = "10.1109/TMTT.2009.2017320",

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pages = "1398--1405",

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TY - JOUR

T1 - Multi-Frequency Continuous-Wave Radar Approach to Ranging in Passive UHF RFID

AU - Arnitz, Daniel

AU - Witrisal, Klaus

AU - Mühlmann, Ulrich

PY - 2009

Y1 - 2009

N2 - In this paper, we present the extension of a recently published two-frequency continuous-wave (CW) ultra-high-frequency RF identification ranging technique to multiple carriers. The proposed system concept relies on exact phase information; hence, the passive tag cannot be accurately modeled as a frequency-flat linear device. A linearized model of the tag's reflection coefficient is devised to bridge the gap between the nonlinear reality and the linear CW radar theory. Estimation error bounds are derived and effects caused by noise and multipath propagation are analyzed in detail. It has been found that systematic errors introduced by the tag's reflection characteristic cannot be compensated by using multiple carriers due to large variations caused by detuning. Nonetheless the system, while being vulnerable to multipath propagation effects, still performs well under line-of-sight conditions; mean average errors below 15% of the true distance are possible in typical fading environments..Published in: IEEE Transactions on Microwave Theory and Techniques ( Volume: 57, Issue: 5, May 2

AB - In this paper, we present the extension of a recently published two-frequency continuous-wave (CW) ultra-high-frequency RF identification ranging technique to multiple carriers. The proposed system concept relies on exact phase information; hence, the passive tag cannot be accurately modeled as a frequency-flat linear device. A linearized model of the tag's reflection coefficient is devised to bridge the gap between the nonlinear reality and the linear CW radar theory. Estimation error bounds are derived and effects caused by noise and multipath propagation are analyzed in detail. It has been found that systematic errors introduced by the tag's reflection characteristic cannot be compensated by using multiple carriers due to large variations caused by detuning. Nonetheless the system, while being vulnerable to multipath propagation effects, still performs well under line-of-sight conditions; mean average errors below 15% of the true distance are possible in typical fading environments..Published in: IEEE Transactions on Microwave Theory and Techniques ( Volume: 57, Issue: 5, May 2

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DO - 10.1109/TMTT.2009.2017320

M3 - Article

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JO - IEEE Transactions on Microwave Theory and Techniques

JF - IEEE Transactions on Microwave Theory and Techniques

IS - 5

ER -

Multi-Frequency Continuous-Wave Radar Approach to Ranging in Passive UHF RFID

Abstract

Treatment code (Nähere Zuordnung)

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Projects

PARIS - Position Aware RFID Systems

Wireless Communications

Cite this