Indoor 3D localization of moving users based on the displacement vector

In an indoor environment, where GPS signal is not available, localization typically relies on triangulation or fingerprint (or radio map) algorithms. These algorithms require the availability of three or more anchor points (or reference points). In this paper, we propose a novel localization algorithm, which can derive the location of moving users with high accuracy based on measuring the technologically feasible displacement vector in an environment where only one anchor point is needed. The proposed localization algorithm can locate a user in a 3dimensional space and has been tested on a smartphone to verify its feasibility and accuracy.