Polarization-Diversity-Based Rotation Sensing Methodology Using COTS UHF RFID Tags

Abstract

Phase-based sensing using ultra high frequency (UHF) radio frequency identification (RFID) has, in recent years, yielded numerous additions to the Internet of Things (IoT). This work presents a polarization diversity based rotation sensing methodology using common-off-the-shelf (COTS) UHF RFID tags identified with a software defined radio (SDR) UHF RFID reader. The proposed methodology uses the tag-to-reader message after fully coherent demodulation to calculate a difference signal of the backscatter load modulation states. This sequence is then used to compute the rotation speed by evaluating its phase change over time. Experimental results are used to validate the theoretical model and to evaluate the performance and limitiations of the proposed system.