Abstract
Ultra-wideband (UWB) is a widely used technology in wireless indoor positioning. However, Non-line-of-sight (NLOS) and complex multipath fading introduce positioning errors to the UWB system. In order to alleviate the influence of non-line-of-sight (NLOS) and multipath fading, a channel-quality-evaluation-based method is proposed in this paper. In the proposed method, the qualities of the channel between unknown nodes and anchor nodes are evaluated by a weighted equation related to the channel impulse response (CIR) characteristics. Anchor nodes with higher quality are selected adaptively for positioning. The experiments showed that this method can reduce the root-mean-squared error (RMSE) of the positioning results by 40.4% on average and 95.78% in some strongly degraded cases.
Highlights
Ultra-wideband (UWB) technology is popular in indoor positioning because of its high resolution and accuracy
The channel impulse response (CIR) is used as the input of the system, which passes through three modules of channel quality evaluation, anchor node selection, and positioning
The experiments were divided into two steps: firstly, the ranging experiment showed the effectiveness of the channel quality evaluation algorithm; secondly, the positioning experiment showed that the accuracy of positioning could be improved by the proposed channel-quality-evaluation-based anchor node selection method
Summary
Ultra-wideband (UWB) technology is popular in indoor positioning because of its high resolution and accuracy. Regarding the method of anchor node selection, some literature has proposed the method based on the dilution of precision (DOP) [11,12]; due to the geometric relationship, using different anchor nodes for the position solution will cause different degrees of error [13], and the combination of anchor nodes with a smaller DOP can obtain better positioning accuracy [14] This solves the problem of the high manual calibration workload, but because NLOS has a very strong influence on ranging in indoor environments, station selection by the DOP alone does not effectively improve the positioning accuracy in the NLOS condition.
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