Pohl, T. M., Arthaber, H., & Mecklenbrauker, C. F. (2023). Reconstruction of Passive UHF RFID Tag Trajectories with a Distributed Antenna Reader System. In Proceedings: 2023 IEEE International Conference on RFID (RFID) (pp. 7–12). https://doi.org/10.1109/RFID58307.2023.10178462
We report on Ultra High Frequency (UHF) Radio Frequency Identification (RFID) phase measurements for the re-construction of passive RFID tag trajectories in an experimental setup. The setup consists of a UHF RFID reader connected to eight distributed antennas in a lab room. The antennas are multiplexed in time by phase-stable coaxial switches. The techniques of Gaussian processes are used to estimate missing phase values in the trajectory. The final tag's position in a two-dimensional space is estimated via an evaluation of the maximum phase difference in the trajectory, followed by a grid search to find the most probable position. For test measurements, this algorithm provides over a traveled distance of 15 m an Root-Mean-Square (RMS) error of approximately 50 cm.
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Project title:
Christian Doppler Labor für Ortssensitive Elektronische Systeme: CD-Labs für "Ortssensitive Elektronische Systeme" (Christian Doppler Forschungsgesells)
