Demo: Tracking Orientation of Batteryless Internet-of-Things using RFID Tags

Orientation tracking is an essential ingredient for many Internet-of-Things applications. In this work, we introduce Tagyro, which attaches an array of passive RFID tags as orientation sensors on everyday objects. Tagyro uses a closed-form model to transform the run-time phase offsets between tags into orientation angle, and addresses the unexpected deviation of phase measurement distorted by imperfect radiation pattern of practical tags. We have implemented a real-time version of Tagyro on a commodity RFID system. In this demo, we show that Tagyro can handle the phase distortion by sensing the effective layout tag array, and use the sensed layout to track the orientation of objects in high accuracy.