A Map-Free Indoor Localization Method Using Ultrawideband Large-Scale Array Systems

In this letter, we propose a novel map-free indoor localization method using ultrawideband large-scale array systems in high-frequency bands. The proposed localization method comprises two stages, namely a channel-estimation stage and a target-localization stage. Due to the large array aperture, the locations of the scatterers associated to the multipath components can be estimated with the spherical wavefront model. The estimated scatterers are further used as virtual anchors to estimate the location of the target through trilateration. Since the scatterer locations are obtained from channel measurements, the map of the environment is not needed for localization. The proposed method is also assessed with measurements conducted in a cluttered indoor environment with line-of-sight (LoS) and non-LoS scenarios. Results show that the proposed algorithm attains good localization accuracy in both scenarios.