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Measuring Time-of-Flight in an Ultrasonic LPS System Using Generalized Cross-Correlation

In this article, a time-of-flight detection technique in the frequency domain is described for an ultrasonic Local Positioning System (LPS) based on encoded beacons. Beacon transmissions have been synchronized and become simultaneous by means of the DS-CDMA (Direct-Sequence Code Division Multiple Ac...

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Autores principales: Villladangos, José Manuel, Ureña, Jesús, García, Juan Jesús, Mazo, Manuel, Hernández, Álvaro, Jiménez, Ana, Ruíz, Daniel, De Marziani, Carlos
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Molecular Diversity Preservation International (MDPI) 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3274287/
https://www.ncbi.nlm.nih.gov/pubmed/22346645
http://dx.doi.org/10.3390/s111110326
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author Villladangos, José Manuel
Ureña, Jesús
García, Juan Jesús
Mazo, Manuel
Hernández, Álvaro
Jiménez, Ana
Ruíz, Daniel
De Marziani, Carlos
author_facet Villladangos, José Manuel
Ureña, Jesús
García, Juan Jesús
Mazo, Manuel
Hernández, Álvaro
Jiménez, Ana
Ruíz, Daniel
De Marziani, Carlos
author_sort Villladangos, José Manuel
collection PubMed
description In this article, a time-of-flight detection technique in the frequency domain is described for an ultrasonic Local Positioning System (LPS) based on encoded beacons. Beacon transmissions have been synchronized and become simultaneous by means of the DS-CDMA (Direct-Sequence Code Division Multiple Access) technique. Every beacon has been associated to a 255-bit Kasami code. The detection of signal arrival instant at the receiver, from which the distance to each beacon can be obtained, is based on the application of the Generalized Cross-Correlation (GCC), by using the cross-spectral density between the received signal and the sequence to be detected. Prior filtering to enhance the frequency components around the carrier frequency (40 kHz) has improved estimations when obtaining the correlation function maximum, which implies an improvement in distance measurement precision. Positioning has been achieved by using hyperbolic trilateration, based on the Time Differences of Arrival (TDOA) between a reference beacon and the others.
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spelling pubmed-32742872012-02-15 Measuring Time-of-Flight in an Ultrasonic LPS System Using Generalized Cross-Correlation Villladangos, José Manuel Ureña, Jesús García, Juan Jesús Mazo, Manuel Hernández, Álvaro Jiménez, Ana Ruíz, Daniel De Marziani, Carlos Sensors (Basel) Article In this article, a time-of-flight detection technique in the frequency domain is described for an ultrasonic Local Positioning System (LPS) based on encoded beacons. Beacon transmissions have been synchronized and become simultaneous by means of the DS-CDMA (Direct-Sequence Code Division Multiple Access) technique. Every beacon has been associated to a 255-bit Kasami code. The detection of signal arrival instant at the receiver, from which the distance to each beacon can be obtained, is based on the application of the Generalized Cross-Correlation (GCC), by using the cross-spectral density between the received signal and the sequence to be detected. Prior filtering to enhance the frequency components around the carrier frequency (40 kHz) has improved estimations when obtaining the correlation function maximum, which implies an improvement in distance measurement precision. Positioning has been achieved by using hyperbolic trilateration, based on the Time Differences of Arrival (TDOA) between a reference beacon and the others. Molecular Diversity Preservation International (MDPI) 2011-10-31 /pmc/articles/PMC3274287/ /pubmed/22346645 http://dx.doi.org/10.3390/s111110326 Text en © 2011 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 license (http://creativecommons.org/licenses/by/3.0/).
spellingShingle Article
Villladangos, José Manuel
Ureña, Jesús
García, Juan Jesús
Mazo, Manuel
Hernández, Álvaro
Jiménez, Ana
Ruíz, Daniel
De Marziani, Carlos
Measuring Time-of-Flight in an Ultrasonic LPS System Using Generalized Cross-Correlation
title Measuring Time-of-Flight in an Ultrasonic LPS System Using Generalized Cross-Correlation
title_full Measuring Time-of-Flight in an Ultrasonic LPS System Using Generalized Cross-Correlation
title_fullStr Measuring Time-of-Flight in an Ultrasonic LPS System Using Generalized Cross-Correlation
title_full_unstemmed Measuring Time-of-Flight in an Ultrasonic LPS System Using Generalized Cross-Correlation
title_short Measuring Time-of-Flight in an Ultrasonic LPS System Using Generalized Cross-Correlation
title_sort measuring time-of-flight in an ultrasonic lps system using generalized cross-correlation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3274287/
https://www.ncbi.nlm.nih.gov/pubmed/22346645
http://dx.doi.org/10.3390/s111110326
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