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A Succinct Method for Non-Line-of-Sight Mitigation for Ultra-Wideband Indoor Positioning System
Ultra-wideband (UWB) is a promising indoor position technology with centimetre-level positioning accuracy in line-of-sight (LOS) situations. However, walls and other obstacles are common in an indoor environment, which can introduce non-line-of-sight (NLOS) and deteriorate UWB positioning accuracy t...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9657962/ https://www.ncbi.nlm.nih.gov/pubmed/36365945 http://dx.doi.org/10.3390/s22218247 |
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author | Liu, Ang Lin, Shiwei Wang, Jianguo Kong, Xiaoying |
author_facet | Liu, Ang Lin, Shiwei Wang, Jianguo Kong, Xiaoying |
author_sort | Liu, Ang |
collection | PubMed |
description | Ultra-wideband (UWB) is a promising indoor position technology with centimetre-level positioning accuracy in line-of-sight (LOS) situations. However, walls and other obstacles are common in an indoor environment, which can introduce non-line-of-sight (NLOS) and deteriorate UWB positioning accuracy to the meter level. This paper proposed a succinct method to identify NLOS induced by walls and mitigate the error for improved UWB positioning with NLOS. First, NLOS is detected by a sliding window method, which can identify approximately 90% of NLOS cases in a harsh indoor environment. Then, a delay model is designed to mitigate the error of the UWB signal propagating through a wall. Finally, all the distance measurements, including LOS and NLOS, are used to calculate the mobile UWB tag position with ordinary least squares (OLS) or weighted least squares (WLS). Experiment results show that with correct NLOS indentation and delay model, the proposed method can achieve positioning accuracy in NLOS environments close to the level of LOS. Compared with OLS, WLS can further optimise the positioning results. Correct NLOS indentation, accurate delay model and proper weights in the WLS are the keys to accurate UWB positioning in NLOS environments. |
format | Online Article Text |
id | pubmed-9657962 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-96579622022-11-15 A Succinct Method for Non-Line-of-Sight Mitigation for Ultra-Wideband Indoor Positioning System Liu, Ang Lin, Shiwei Wang, Jianguo Kong, Xiaoying Sensors (Basel) Article Ultra-wideband (UWB) is a promising indoor position technology with centimetre-level positioning accuracy in line-of-sight (LOS) situations. However, walls and other obstacles are common in an indoor environment, which can introduce non-line-of-sight (NLOS) and deteriorate UWB positioning accuracy to the meter level. This paper proposed a succinct method to identify NLOS induced by walls and mitigate the error for improved UWB positioning with NLOS. First, NLOS is detected by a sliding window method, which can identify approximately 90% of NLOS cases in a harsh indoor environment. Then, a delay model is designed to mitigate the error of the UWB signal propagating through a wall. Finally, all the distance measurements, including LOS and NLOS, are used to calculate the mobile UWB tag position with ordinary least squares (OLS) or weighted least squares (WLS). Experiment results show that with correct NLOS indentation and delay model, the proposed method can achieve positioning accuracy in NLOS environments close to the level of LOS. Compared with OLS, WLS can further optimise the positioning results. Correct NLOS indentation, accurate delay model and proper weights in the WLS are the keys to accurate UWB positioning in NLOS environments. MDPI 2022-10-27 /pmc/articles/PMC9657962/ /pubmed/36365945 http://dx.doi.org/10.3390/s22218247 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Liu, Ang Lin, Shiwei Wang, Jianguo Kong, Xiaoying A Succinct Method for Non-Line-of-Sight Mitigation for Ultra-Wideband Indoor Positioning System |
title | A Succinct Method for Non-Line-of-Sight Mitigation for Ultra-Wideband Indoor Positioning System |
title_full | A Succinct Method for Non-Line-of-Sight Mitigation for Ultra-Wideband Indoor Positioning System |
title_fullStr | A Succinct Method for Non-Line-of-Sight Mitigation for Ultra-Wideband Indoor Positioning System |
title_full_unstemmed | A Succinct Method for Non-Line-of-Sight Mitigation for Ultra-Wideband Indoor Positioning System |
title_short | A Succinct Method for Non-Line-of-Sight Mitigation for Ultra-Wideband Indoor Positioning System |
title_sort | succinct method for non-line-of-sight mitigation for ultra-wideband indoor positioning system |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9657962/ https://www.ncbi.nlm.nih.gov/pubmed/36365945 http://dx.doi.org/10.3390/s22218247 |
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