Synthetic aperture radar
Tracking moving devices with the cricket location system
Proceedings of the 2nd international conference on Mobile systems, applications, and services
LANDMARC: indoor location sensing using active RFID
Wireless Networks - Special issue: Pervasive computing and communications
Fundamentals of wireless communication
Fundamentals of wireless communication
Indoor localization without the pain
Proceedings of the sixteenth annual international conference on Mobile computing and networking
Zee: zero-effort crowdsourcing for indoor localization
Proceedings of the 18th annual international conference on Mobile computing and networking
ArrayTrack: a fine-grained indoor location system
nsdi'13 Proceedings of the 10th USENIX conference on Networked Systems Design and Implementation
PinPoint: localizing interfering radios
nsdi'13 Proceedings of the 10th USENIX conference on Networked Systems Design and Implementation
RF-compass: robot object manipulation using RFIDs
Proceedings of the 19th annual international conference on Mobile computing & networking
3D tracking via body radio reflections
NSDI'14 Proceedings of the 11th USENIX Conference on Networked Systems Design and Implementation
Hi-index | 0.00 |
RFIDs are emerging as a vital component of the Internet of Things. In 2012, billions of RFIDs have been deployed to locate equipment, track drugs, tag retail goods, etc. Current RFID systems, however, can only identify whether a tagged object is within radio range (which could be up to tens of meters), but cannot pinpoint its exact location. Past proposals for addressing this limitation rely on a line-of-sight model and hence perform poorly when faced with multipath effects or non-line-of-sight, which are typical in real-world deployments. This paper introduces the first fine-grained RFID positioning system that is robust to multipath and non-line-of-sight scenarios. Unlike past work, which considers multipath as detrimental, our design exploits multipath to accurately locate RFIDs. The intuition underlying our design is that nearby RFIDs experience a similar multipath environment (e.g., reflectors in the environment) and thus exhibit similar multipath profiles. We capture and extract these multipath profiles by using a synthetic aperture radar (SAR) created via antenna motion. We then adapt dynamic time warping (DTW) techniques to pinpoint a tag's location. We built a prototype of our design using USRP software radios. Results from a deployment of 200 commercial RFIDs in our university library demonstrate that the new design can locate misplaced books with a median accuracy of 11~cm.