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Simulating Signal Aberration and Ranging Error for Ultrasonic Indoor Positioning

Increasing efforts toward the development of positioning techniques testify the growing interest for indoor position-based applications and services. Many applications require accurate indoor positioning or tracking of people and assets, and some market sectors are starting a rapid growth of product...

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Autores principales: Carotenuto, Riccardo, Merenda, Massimo, Iero, Demetrio, G. Della Corte, Francesco
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7348884/
https://www.ncbi.nlm.nih.gov/pubmed/32585908
http://dx.doi.org/10.3390/s20123548
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author Carotenuto, Riccardo
Merenda, Massimo
Iero, Demetrio
G. Della Corte, Francesco
author_facet Carotenuto, Riccardo
Merenda, Massimo
Iero, Demetrio
G. Della Corte, Francesco
author_sort Carotenuto, Riccardo
collection PubMed
description Increasing efforts toward the development of positioning techniques testify the growing interest for indoor position-based applications and services. Many applications require accurate indoor positioning or tracking of people and assets, and some market sectors are starting a rapid growth of products based on these technologies. Ultrasonic systems have already been demonstrating their effectiveness and to possess the desired positioning accuracy and refresh rates. In this work, it is shown that a typical signal used in ultrasonic positioning systems to estimate the range between the target and reference points—namely, the linear chirp—due to the effects of acoustic diffraction, in some cases, undergoes a shape aberration, depending on the shape and size of the transducer and on the angle under which the transducer is seen by the receiver. In the presence of such signal shape aberrations, even one of the most robust ranging techniques, which is based on cross-correlation, provides results affected by a much greater error than expected. Numerical simulations are carried out for a typical ultrasonic chirp, ultrasonic emitter, and range technique based on cross-correlation and for a typical office room, obtained using the academic acoustic simulation software Field II. Spatial distributions of the ranging error are provided, clearly showing the favorable low error regions. The work demonstrates that particular attention must be paid to the design of the acoustic section of the ultrasonic positioning systems, considering both the shape and size of the ultrasonic emitters and the shape of the acoustic signal used.
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spelling pubmed-73488842020-07-22 Simulating Signal Aberration and Ranging Error for Ultrasonic Indoor Positioning Carotenuto, Riccardo Merenda, Massimo Iero, Demetrio G. Della Corte, Francesco Sensors (Basel) Article Increasing efforts toward the development of positioning techniques testify the growing interest for indoor position-based applications and services. Many applications require accurate indoor positioning or tracking of people and assets, and some market sectors are starting a rapid growth of products based on these technologies. Ultrasonic systems have already been demonstrating their effectiveness and to possess the desired positioning accuracy and refresh rates. In this work, it is shown that a typical signal used in ultrasonic positioning systems to estimate the range between the target and reference points—namely, the linear chirp—due to the effects of acoustic diffraction, in some cases, undergoes a shape aberration, depending on the shape and size of the transducer and on the angle under which the transducer is seen by the receiver. In the presence of such signal shape aberrations, even one of the most robust ranging techniques, which is based on cross-correlation, provides results affected by a much greater error than expected. Numerical simulations are carried out for a typical ultrasonic chirp, ultrasonic emitter, and range technique based on cross-correlation and for a typical office room, obtained using the academic acoustic simulation software Field II. Spatial distributions of the ranging error are provided, clearly showing the favorable low error regions. The work demonstrates that particular attention must be paid to the design of the acoustic section of the ultrasonic positioning systems, considering both the shape and size of the ultrasonic emitters and the shape of the acoustic signal used. MDPI 2020-06-23 /pmc/articles/PMC7348884/ /pubmed/32585908 http://dx.doi.org/10.3390/s20123548 Text en © 2020 by the authors. 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/).
spellingShingle Article
Carotenuto, Riccardo
Merenda, Massimo
Iero, Demetrio
G. Della Corte, Francesco
Simulating Signal Aberration and Ranging Error for Ultrasonic Indoor Positioning
title Simulating Signal Aberration and Ranging Error for Ultrasonic Indoor Positioning
title_full Simulating Signal Aberration and Ranging Error for Ultrasonic Indoor Positioning
title_fullStr Simulating Signal Aberration and Ranging Error for Ultrasonic Indoor Positioning
title_full_unstemmed Simulating Signal Aberration and Ranging Error for Ultrasonic Indoor Positioning
title_short Simulating Signal Aberration and Ranging Error for Ultrasonic Indoor Positioning
title_sort simulating signal aberration and ranging error for ultrasonic indoor positioning
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7348884/
https://www.ncbi.nlm.nih.gov/pubmed/32585908
http://dx.doi.org/10.3390/s20123548
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