TOA localization for multipath and NLOS environment with virtual stations

An effective geometrical method which can locate a source based on the time-of-arrival (TOA) measurements and the floor plan information is proposed in simple non-line-of-sight (NLOS) indoor environment where the multiplebound scattering signal paths can be ignored. The novelty of our work resides in converting the NLOS problem into line-of-sight (LOS) problem based on the virtual stations (VSs), so that the localization algorithm for LOS conditions can be applied in simple NLOS conditions. The performance bound of the proposed method is also analyzed. Simulation results demonstrate the effectiveness of the proposed method.