MagSerea: Fingerprinting Magnetic Field of Specified Area with Wearable Sensors

In environments where GPS is impractical for indoor positioning, magnetic information has emerged as a promising alternative. This study proposes a novel location fingerprinting method called "MagSerea ((Magnetic Field of Specified aREA))," which utilizes time-series data of three-axis magnetic information obtained by a wearable device attached to the arm when opening a door. Experimental results indicate that the door-opening motion restricts the deviations in the device’s position and angle, thereby maintaining high identification accuracy despite aging and changes in user’s possessions. These findings suggest that MagSerea demonstrates high identification accuracy in real-world conditions, offering lower installation costs and fewer constraints on reference points compared to existing methods, and thus holds potential for a wide range of applications.