An Initialization Method for Ultra-Precise Holographic Wireless Local Positioning

Indoor localization is a current research field with the potential to impact many aspects of everyday life. For this purpose, the iterated holographic extended Kalman filter (IHEKF) was supposed, which iteratively evaluates the phase difference measurements at spatially distributed antennas of several receivers to achieve unambiguous and accurate positioning. It is able to precisely localize beacons with arbitrary modulated transmit signals due to the evaluation of phase differences and, hence, is well suited for use in communication systems. In this paper, an initialization method for the IHEKF is proposed, that is able to cope with the hindering phase ambiguity of sparse arrays. The method is demonstrated using a 24 GHz experimental setup, providing 3D localization results with an outstanding accuracy in the sub-cm range.