Self-Locating RFID Robot for Tag Localization in Retails

This paper presents a RFID-based mobile robot able of self-locating within an indoor scenario and to estimate the position of target UHF-RFID tags. To locate itself, the robot exploits a sensor-fusion method which combines data from an infrastructure of passive reference RFID tags arranged in known locations and data from rotary wheel encoders. Besides, during its motion it is able of measuring the target tag locations through a synthetic-array approach. The knowledge of the reader antenna trajectory is here achieved from the RFID-based sensor-fusion method which exhibits a localization error lower than 0.27 m for 20-m long paths in a real office environment. Then, the estimated trajectory is exploited for target tag localization with high accuracy by using the synthetic-array approach.

Automated summary

This paper presents a RFID-based mobile robot capable of self-locating within an indoor scenario and estimating the position of target UHF-RFID tags by combining sensor-fusion method and synthetic-array approach. The system exhibits a localization error lower than 0.27 m for 20-m long paths in a real office environment, and achieves high accuracy in target tag localization using the estimated trajectory.