Wireless-Signal Map-Matching for Non-Line-Of-Sight Error Calibration

This paper proposes a new wireless-signal map-matching technique for calibrating non-line-of-sight positioning error in urban environments. Compared with conventional map-matching methods that utilise a continuously-tracked single user trajectory, the proposed map-matching method utilises a considerable number of different user locations for comparison with ideal map information. By appying the proposed technique to the sampled network measurements, non-line-of-sight error correction maps for the distorted position domain are generated. Once the non-line-of-sight error correction maps are constructed they can be thereafter applied to the same type of measurements. Since the proposed wireless-signal map-matching algorithm can be installed either inside or outside the core network structure, and is applicable to any type of network measurements such as time-of-arrival, time-difference-of-arrival, and angle-of-arrival, it exhibits good implementation flexibility. A simulation result, assuming a typical dense urban environment, demonstrates the benefits of the proposed wireless-signal map-matching technique.