Indoor Dynamic Positioning Method Exploiting Passive RFID System

In this paper, we propose a novel method for dynamic positioning using a single passive RFID tag to obtain its position through phase. This method addresses the phase integer ambiguity by introducing a robust phase unwrapping algorithm, solves the initial position problem using the maximum probability algorithm, and achieves accurate dynamic positioning through linear intersection. Experimental results demonstrate that our proposed method supports both static and dynamic positioning (speed <8.32 m/s) with an average positioning error of only 2.56%. Compared with existing RFID positioning methods, the proposed method can achieve competitive localization performance and enable high sampling frequency and fast processing on local computers, ensuring its suitability for dynamic indoor positioning applications.