Journal
IEEE TRANSACTIONS ON MOBILE COMPUTING
Volume 20, Issue 2, Pages 634-646Publisher
IEEE COMPUTER SOC
DOI: 10.1109/TMC.2019.2949412
Keywords
RFID; tracking; orientation; polarization
Funding
- National Key R&D Program of China [2017YFB1003000]
- NationalNatural Science Foundation of China [61772306, 61672240]
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The research proposes an orientation-aware RFID tracking approach, OmniTrack, to address the accuracy degradation issue caused by existing orientation-oblivious models. Experimental results demonstrate that OmniTrack has significant advantages in tracking the location and orientation of a mobile tag.
RFID tracking attracts a lot of research efforts in recent years. Most of the existing approaches, however, adopt an orientation-oblivious model. When tracking a target whose orientation changes, those approaches suffer from serious accuracy degradation. In order to achieve target tracking with pervasive applicability in various scenarios, in this article, we propose OmniTrack, an orientation-aware RFID tracking approach. Our study presents a generic model that discribes the linear relationship between the tag orientation and the phase change of the backscattered signals. Based on this finding, we propose an orientation-aware phase model to explicitly quantify the respective impact of the read-tag distance and the tag's orientation. OmniTrack addresses practical challenges in tracking the location and orientation of a mobile tag. Our experimental results demonstrate that OmniTrack achieves centimeter-level location accuracy and has significant advantages in tracking targets with varing orientations, compared to the state-of-the-art approaches.
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