Feasibility Assessment and Enhancement of TOF-Based UWB RTLS for Non-Line-of-Sight Conditions on Construction Sites
Publication: Construction Research Congress 2022
ABSTRACT
Studies in the past decades have shown that Real-Time Location Systems (RTLS) have strong potential in improving safety and enhancing productivity on construction sites. Ultra-Wide Band (UWB) RTLS in particular, has demonstrated high suitability for construction site conditions due to its higher accuracy, lower dependency on the Line-Of-Sight (LOS), and less signal attenuation and multipath effect. However, higher tolerance to Non-Line-Of-Sight (NLOS) is not equivalent to not having impacts on the accuracy of location estimation. To reduce the impact of NLOS, typically standardized residual analysis of Least Square or Kalman Filter are used (to detect and remove the outliers). However, these methods can only be functional with a minimum of five anchors. The objective of this study is to determine and mitigate the impact of NLOS on location estimation accuracy of TOF-based UWB RTLS when only four anchors are utilized. The proposed mitigation methodology provides an accuracy improvement of more than 60%, which is significant especially for applications such as safety where accuracy is paramount on construction sites.
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Construction Research Congress 2022
Pages: 344 - 353
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Published online: Mar 7, 2022
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