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      Ultrasonic Multiple-Access Ranging System Using Spread Spectrum and MEMS Technology for Indoor Localization

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          Abstract

          Indoor localization of persons and objects poses a great engineering challenge. Previously developed localization systems demonstrate the use of wideband techniques in ultrasound ranging systems. Direct sequence and frequency hopping spread spectrum ultrasound signals have been proven to achieve a high level of accuracy. A novel ranging method using the frequency hopping spread spectrum with finite impulse response filtering will be investigated and compared against the direct sequence spread spectrum. In the first setup, distances are estimated in a single-access environment, while in the second setup, two senders and one receiver are used. During the experiments, the micro-electromechanical systems are used as ultrasonic sensors, while the senders were implemented using field programmable gate arrays. Results show that in a single-access environment, the direct sequence spread spectrum method offers slightly better accuracy and precision performance compared to the frequency hopping spread spectrum. When two senders are used, measurements point out that the frequency hopping spread spectrum is more robust to near-far effects than the direct sequence spread spectrum.

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          Most cited references21

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          The anatomy of a context-aware application

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            DOLPHIN: an autonomous indoor positioning system in ubiquitous computing environment

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              A Novel Broadband Ultrasonic Location System

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                Author and article information

                Journal
                Sensors (Basel)
                Sensors (Basel)
                Sensors (Basel, Switzerland)
                Molecular Diversity Preservation International (MDPI)
                1424-8220
                February 2014
                18 February 2014
                : 14
                : 2
                : 3172-3187
                Affiliations
                [1 ] Department of Industrial Sciences and Technology (INDI), Vrije Universiteit Brussel, Pleinlaan 2, Elsene 1050, Belgium; E-Mails: an.braeken@ 123456vub.ac.be (A.B.); abdellah.touhafi@ 123456vub.ac.be (A.T.)
                [2 ] Department of Electronics and Informatics (ETRO), Vrije Universiteit Brussel, Pleinlaan 2, Elsene 1050, Belgium; E-Mail: jelmer.tiete@ 123456etro.vub.ac.be
                Author notes

                Author Contributions: All contributions to this work are made by the authors and the individual tasks were divided as follows: Laurent Segers made the main contribution by making the original implementation and doing the accompanying measurements. Jelmer Tiete provided technical background and knowledge on the ultrasound transducers and theory. An Braeken helped with the statistical analysis of the measurement results, while Abdellah Touhafi was the official advisor of this work.

                [* ] Author to whom correspondence should be addressed; E-Mail: laurent.segers@ 123456vub.ac.be ; Tel.: +3-225-591-528.
                Article
                sensors-14-03172
                10.3390/s140203172
                3958221
                24553084
                de172caf-e857-4afb-8519-8140340a29f4
                © 2014 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/).

                History
                : 25 December 2013
                : 17 January 2014
                : 08 February 2014
                Categories
                Article

                Biomedical engineering
                ultrasound wideband indoor localization,ultrasound multiple-access ranging,ultrasound fhss using finite impulse response filtering,ultrasound dsss

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