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    High reliability outdoor sonar prototype based on efficient signal coding

    TitleHigh reliability outdoor sonar prototype based on efficient signal coding
    Publication TypeJournal Article
    Año de publicación2006
    AutoresÁlvarez, FJ, Ureña, J, Mazo, M, Hernández, Á, Garcia, JJ, Marzziani, CD
    Idioma de publicaciónEnglish
    JournalIEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
    Volumen53
    Número10
    Páginas1862-1872
    Fecha de publicación01/2006
    Lugar de publicaciónUSA
    EditorialIEEE
    ISSN0885-3010
    Abstract

    Many mobile robots and autonomous vehicles designed for outdoor operation have incorporated ultrasonic sensors in their navigation systems, whose function is mainly to avoid possible collisions with very close obstacles. The use of these systems in more precise tasks requires signal encoding and the incorporation of pulse compression techniques that have already been used with success in the design of high-performance indoor sonars. However, the transmission of ultrasonic encoded signals outdoors entails a new challenge because of the effects of atmospheric turbulence. This phenomenon causes random fluctuations in the phase and amplitude of traveling acoustic waves, a fact that can make the encoded signal completely unrecognizable by its matched receiver. Atmospheric turbulence is investigated in this work, with the aim of determining the conditions under which it is possible to assure the reliable outdoor operation of an ultrasonic pulse compression system. As a result of this analysis, a novel sonar prototype based on complementary sequences coding is developed and experimentally tested. This encoding scheme provides the system with very useful additional features, namely, high robustness to noise, multi-mode operation capability (simultaneous emissions with minimum cross talk interference), and the possibility of applying an efficient detection algorithm that notably decreases the hardware resource requirements

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