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A Robust High-Accuracy Ultrasound Indoor Positioning System Based on a Wireless Sensor Network

This paper describes the development and implementation of a robust high-accuracy ultrasonic indoor positioning system (UIPS). The UIPS consists of several wireless ultrasonic beacons in the indoor environment. Each of them has a fixed and known position coordinate and can collect all the transmissi...

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Autores principales: Qi, Jun, Liu, Guo-Ping
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5713469/
https://www.ncbi.nlm.nih.gov/pubmed/29113126
http://dx.doi.org/10.3390/s17112554
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author Qi, Jun
Liu, Guo-Ping
author_facet Qi, Jun
Liu, Guo-Ping
author_sort Qi, Jun
collection PubMed
description This paper describes the development and implementation of a robust high-accuracy ultrasonic indoor positioning system (UIPS). The UIPS consists of several wireless ultrasonic beacons in the indoor environment. Each of them has a fixed and known position coordinate and can collect all the transmissions from the target node or emit ultrasonic signals. Every wireless sensor network (WSN) node has two communication modules: one is WiFi, that transmits the data to the server, and the other is the radio frequency (RF) module, which is only used for time synchronization between different nodes, with accuracy up to 1 [Formula: see text] s. The distance between the beacon and the target node is calculated by measuring the time-of-flight (TOF) for the ultrasonic signal, and then the position of the target is computed by some distances and the coordinate of the beacons. TOF estimation is the most important technique in the UIPS. A new time domain method to extract the envelope of the ultrasonic signals is presented in order to estimate the TOF. This method, with the envelope detection filter, estimates the value with the sampled values on both sides based on the least squares method (LSM). The simulation results show that the method can achieve envelope detection with a good filtering effect by means of the LSM. The highest precision and variance can reach [Formula: see text] mm and [Formula: see text] mm, respectively, in pseudo-range measurements with UIPS. A maximum location error of [Formula: see text] mm is achieved in the positioning experiments for a moving robot, when UIPS works on the line-of-sight (LOS) signal.
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spelling pubmed-57134692017-12-07 A Robust High-Accuracy Ultrasound Indoor Positioning System Based on a Wireless Sensor Network Qi, Jun Liu, Guo-Ping Sensors (Basel) Article This paper describes the development and implementation of a robust high-accuracy ultrasonic indoor positioning system (UIPS). The UIPS consists of several wireless ultrasonic beacons in the indoor environment. Each of them has a fixed and known position coordinate and can collect all the transmissions from the target node or emit ultrasonic signals. Every wireless sensor network (WSN) node has two communication modules: one is WiFi, that transmits the data to the server, and the other is the radio frequency (RF) module, which is only used for time synchronization between different nodes, with accuracy up to 1 [Formula: see text] s. The distance between the beacon and the target node is calculated by measuring the time-of-flight (TOF) for the ultrasonic signal, and then the position of the target is computed by some distances and the coordinate of the beacons. TOF estimation is the most important technique in the UIPS. A new time domain method to extract the envelope of the ultrasonic signals is presented in order to estimate the TOF. This method, with the envelope detection filter, estimates the value with the sampled values on both sides based on the least squares method (LSM). The simulation results show that the method can achieve envelope detection with a good filtering effect by means of the LSM. The highest precision and variance can reach [Formula: see text] mm and [Formula: see text] mm, respectively, in pseudo-range measurements with UIPS. A maximum location error of [Formula: see text] mm is achieved in the positioning experiments for a moving robot, when UIPS works on the line-of-sight (LOS) signal. MDPI 2017-11-06 /pmc/articles/PMC5713469/ /pubmed/29113126 http://dx.doi.org/10.3390/s17112554 Text en © 2017 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
Qi, Jun
Liu, Guo-Ping
A Robust High-Accuracy Ultrasound Indoor Positioning System Based on a Wireless Sensor Network
title A Robust High-Accuracy Ultrasound Indoor Positioning System Based on a Wireless Sensor Network
title_full A Robust High-Accuracy Ultrasound Indoor Positioning System Based on a Wireless Sensor Network
title_fullStr A Robust High-Accuracy Ultrasound Indoor Positioning System Based on a Wireless Sensor Network
title_full_unstemmed A Robust High-Accuracy Ultrasound Indoor Positioning System Based on a Wireless Sensor Network
title_short A Robust High-Accuracy Ultrasound Indoor Positioning System Based on a Wireless Sensor Network
title_sort robust high-accuracy ultrasound indoor positioning system based on a wireless sensor network
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5713469/
https://www.ncbi.nlm.nih.gov/pubmed/29113126
http://dx.doi.org/10.3390/s17112554
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