An Effective Phase-Based Localization Approach Under Multipath Environments

Multipath channel has always been a big challenge in accurate indoor localization based on Radio Frequency Identification (RFID) technique. To mitigate this problem, we present a simple but effective localization approach which utilizes Phase of Arrival (POA) as the measurement information and linear least squares as geometrical localization estimation algorithm. In this approach, we make an accurate phase extracting criterion and also propose a reasonable line of sight (LOS) computation method which depends on the addition of the reference tags. Experimental results show that the proposed approach can achieve a position error of about 1 m under multipath environments and is robust to the environmental dynamics.