A Synthetic Aperture Based Method for Reflector Positioning via Moving Tag in UHF RFID System

摘要

As a general rule, the multipath propagation will reduce the reliability of radio frequency identification (RFID) based localization technologies. In this paper, we investigate the reflection of electromagnetic waves and the polarization characteristics of commonly used reader antennas and tag antennas, and model the multipath superposition of signals, so that the multipath effect can be calculated using known environmental information. Based on the multipath superposition model, a novel reflector positioning algorithm is proposed, which can estimate the orientation, length and location of a planar reflector. The proposed algorithm leverages the synthetic aperture radar (SAR) RFID localization idea, that is, from the relative movement of tag and reader antenna, we can obtain more correlated information to enhance the localization reliability. The performance of the proposed reflector localization algorithm is evaluated by simulations.