Abstract

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.

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