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RFID landslide monitoring : long-term outdoor signal processing and phase unwrapping
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  • Arthur Charléty ,
  • Mathieu Le Breton ,
  • Laurent Baillet ,
  • Eric Larose
Arthur Charléty
Institut des Sciences de la Terre (ISTerre)

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Mathieu Le Breton
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Laurent Baillet
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Eric Larose
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Abstract

Localization of passive Radio-Frequency Identification (RFID) tags has been used to monitor landslide surface displacement since 5 years. This method, applied on slow displacements lower than 1cm per day, allows a high spatiotemporal resolution at a relatively low cost. With the feedback of the previous years, this paper proposes to summarize the various challenges encountered with the long-term outdoor RFID localization method, and presents data-processing solutions that were implemented to overcome these challenges. We propose a complex-smoothing unwrapping algorithm, a multi-frequency merging operation, as well as multi-tag and multi-antenna phase combining method. The concept of an unwrapping reference guide is presented and applied with groups of tags showing coherent displacements, or with absolute reference measurements. These approaches allow a higher data availability up to 38% for one site over multiple years, and a better phase unwrapping. Earth surface displacement monitoring with RFID proves to be a robust and accurate solution, with four equipped sites across France and Switzerland.
2023Published in IEEE Journal of Radio Frequency Identification volume 7 on pages 319-329. 10.1109/JRFID.2023.3256560