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    Doppler-tolerant receiver for an ultrasonic LPS based on Kasami sequences

    TítuloDoppler-tolerant receiver for an ultrasonic LPS based on Kasami sequences
    Tipo de publicaciónJournal Article
    Año de publicación2012
    AutoresÁlvarez, FJ, Hernández, Á, Moreno, JA, Pérez, CM, Ureña, J, Marziani, DC
    Idioma de publicaciónEnglish
    Revista académicaSensors and Actuators A: Physical
    Páginaspp. 238-253
    Fecha de publicación10/2012

    This paper presents the design of a novel receiver for a broadband ultrasonic Local Positioning System (LPS). As in other devices based on matched filtering of the transmitted encoded signals, this receiver features high robustness to noise and multiple access capability. Unlike previous solutions, the proposed
    receiver is capable of detecting beacons emissions despite being installed in a fast moving device, and it also provides estimation of its velocity. The system has been implemented in an FPGA-based architecture.
    An experimental analysis of performance has been carried out. Firstly using a set of test signals synthetically generated to simulate different positions and velocities of the receiver. Secondly, a set of real signals obtained with a prototype have been used. The simulated results show the capability of the system to detect the encoded signals emitted by the LPS infrastructure when the device is moving at velocities of up to 3 m/s under low SNR conditions. The real results confirm the improved system capability, but also make evident the negative influence that phenomena such as the transducers response and multipath propagation can have on system performance.


    Escuela Politecnica Superior


    University of Extremadura
    University of Alcala


    Department of Electronics