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Distance Measurements in UWB-Radio Localization Systems Corrected with a Feedforward Neural Network Model

An ultra-wideband (UWB) localization system is an alternative in a GPS-denied environment. However, a distance measurement with UWB modules using a two-way communication protocol induces an orientation-dependent error. Previous research studied this error by looking at parameters such as the receive...

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Detalles Bibliográficos
Autores principales: Krapež, Peter, Vidmar, Matjaž, Munih, Marko
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8036969/
https://www.ncbi.nlm.nih.gov/pubmed/33806012
http://dx.doi.org/10.3390/s21072294
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author Krapež, Peter
Vidmar, Matjaž
Munih, Marko
author_facet Krapež, Peter
Vidmar, Matjaž
Munih, Marko
author_sort Krapež, Peter
collection PubMed
description An ultra-wideband (UWB) localization system is an alternative in a GPS-denied environment. However, a distance measurement with UWB modules using a two-way communication protocol induces an orientation-dependent error. Previous research studied this error by looking at parameters such as the received power and the channel response signal. In this paper, the neural network (NN) method for correcting the orientation-induced distance error without the need to calculate the signal strength, obtain the channel response or know any parameters of the antenna and the UWB modules is presented. The NN method utilizes only the measured distance and the tag orientation, and implements an NN model obtained by machine learning, using measurements at different distances and orientations of the two UWB modules. The verification of the experimental setup with 12 anchors and a tag shows that with the proposed NN method, 5 cm better root mean square error values (RMSEs) are obtained for the measured distance between the anchors and the tag compared to the calibration method that did not include orientation information. With the least-square estimator, 14 cm RMSE in 3D is obtained with the NN model corrected distances, with a 9 cm improvement compared to when raw distances are used. The method produces better results without the need to obtain the UWB module’s diagnostics parameters that are required to calculate the received signal strength or channel response, and in this way maintain the minimum packet size for the ranging protocol.
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spelling pubmed-80369692021-04-12 Distance Measurements in UWB-Radio Localization Systems Corrected with a Feedforward Neural Network Model Krapež, Peter Vidmar, Matjaž Munih, Marko Sensors (Basel) Article An ultra-wideband (UWB) localization system is an alternative in a GPS-denied environment. However, a distance measurement with UWB modules using a two-way communication protocol induces an orientation-dependent error. Previous research studied this error by looking at parameters such as the received power and the channel response signal. In this paper, the neural network (NN) method for correcting the orientation-induced distance error without the need to calculate the signal strength, obtain the channel response or know any parameters of the antenna and the UWB modules is presented. The NN method utilizes only the measured distance and the tag orientation, and implements an NN model obtained by machine learning, using measurements at different distances and orientations of the two UWB modules. The verification of the experimental setup with 12 anchors and a tag shows that with the proposed NN method, 5 cm better root mean square error values (RMSEs) are obtained for the measured distance between the anchors and the tag compared to the calibration method that did not include orientation information. With the least-square estimator, 14 cm RMSE in 3D is obtained with the NN model corrected distances, with a 9 cm improvement compared to when raw distances are used. The method produces better results without the need to obtain the UWB module’s diagnostics parameters that are required to calculate the received signal strength or channel response, and in this way maintain the minimum packet size for the ranging protocol. MDPI 2021-03-25 /pmc/articles/PMC8036969/ /pubmed/33806012 http://dx.doi.org/10.3390/s21072294 Text en © 2021 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 (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ).
spellingShingle Article
Krapež, Peter
Vidmar, Matjaž
Munih, Marko
Distance Measurements in UWB-Radio Localization Systems Corrected with a Feedforward Neural Network Model
title Distance Measurements in UWB-Radio Localization Systems Corrected with a Feedforward Neural Network Model
title_full Distance Measurements in UWB-Radio Localization Systems Corrected with a Feedforward Neural Network Model
title_fullStr Distance Measurements in UWB-Radio Localization Systems Corrected with a Feedforward Neural Network Model
title_full_unstemmed Distance Measurements in UWB-Radio Localization Systems Corrected with a Feedforward Neural Network Model
title_short Distance Measurements in UWB-Radio Localization Systems Corrected with a Feedforward Neural Network Model
title_sort distance measurements in uwb-radio localization systems corrected with a feedforward neural network model
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8036969/
https://www.ncbi.nlm.nih.gov/pubmed/33806012
http://dx.doi.org/10.3390/s21072294
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