Indoor Localization Algorithm Based on Unsynchronized Phase Error Elimination

Many previous localization systems employ multiple receivers to localize a target in indoor environments by measuring the differences of time of flight of propagation paths from a target to each receiver. However, these systems demand strict time synchronization among receivers, which is laborious to deploy in indoor scenarios. To tackle this problem, we propose a novel localization scheme that can achieve target localization without the need for time synchronization. By utilizing a master-slave archi-tecture, the proposed scheme calculates the difference of carrier phase to derive the target's location accurately. Simulation results show that the proposed scheme can achieves high localization accuracy with a median error of 51.6 cm under a asynchronous condition.