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    Improvement of Cover Area in Ultrasonic Local Positioning System Using Cylindrical PVDF Transducer.

    TítuloImprovement of Cover Area in Ultrasonic Local Positioning System Using Cylindrical PVDF Transducer.
    Tipo de publicaciónConference Paper
    Año de publicación2007
    AutoresVilladangos, JM, Ureña, J, Mazo, M, Hernández, Á, Marzziani, CD, Jimenez, A, Álvarez, FJ
    Idioma de publicaciónEnglish
    Conference NameIEEE Internacional Symposium on Industrial Electronics (ISIE'07).
    Volumen1
    Numero de volúmenes1
    Páginas1473 - 1477
    EditorialIEEE
    Conference LocationVigo, España
    Fecha de publicación04/06/2007
    Numero ISBN1-4244-0755-9
    Palabras claveCylindrical PVDF Transducer, Ultrasonic Local Positioning
    DOI10.1109/ISIE.2007.4374819
    URLhttp://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4374819&isnumber=4374555
    Resumen

    This work describes the design of a reflector for a
    PVDF-based ultrasonic transducer (Piezofilm transducer) to
    carry out a ultrasonic beacon system, where the covered area be
    improved and a 3D indoor positioning be guaranteed. The
    proposed Local Positioning System (LPS) for Mobile Robots (MR)
    uses simultaneous emissions from ultrasonic beacons. In order to
    solve the problem of simultaneous emissions from ultrasonic
    beacons, the well-known technique Direct Sequence Code
    Multiple Division Access (DS-CDMA) is used. This technique
    encodes the ultrasonic signal with a 127-bit Gold code for every
    beacon. It implies the emitted signal by every beacon to have a
    wide bandwidth. PVDF-based transducers suitably guarantee this
    requirement. Their cylindrical or semi-cylindrical shape makes
    the emission pattern not suitable when using them as ultrasonic
    beacons, often located in the ceiling of an indoor room. To adapt
    the emission pattern and to increase the covered area in the
    ground, the design process of a conical reflector is described.

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