A Study of Reference Node Placement based on 4- quadrant Node Selection in Ultra Wideband Indoor Positioning System

This paper investigated the impact of the reference node (RN) placement on the localization performance of Ultra wideband (UWB) indoor positioning system. Different RN- placement patterns based on 4-quadrant node selection strategy were experimented. The accuracy performance of UWB indoor positioning systems was evaluated with 3D trilateration algorithm. Experimental results showed that the RN placement with a crossing pattern (Pattern A) provided the highest location accuracy performance in which an average error distance was less than 0.24 m. Moreover, we found that the RN placement with a sloping pattern (Pattern B) could cause the accuracy performance degradation up to 66%. In particular, the positioning error of y- and z-coordinate of the tag placed in the middle for Pattern B was almost 1 m.