TESA laboratory works simultaneously on two projects: FIL (Information Fusion for Localization) and TRANSCONTROL (control and follow-up of dangerous goods transportation). This paper shows how it is possible to increase satellite-based positioning systems performances, at least in terms of accuracy and availability by using hybridization with wireless telecommunication systems (such as GSM, Wifi, UWB and DVB television signals) that are often widely deployed in urban and indoor environments. Rather than simply transmitting to the receiver information easing satellite signals acquisition as Assisted GPS (A-GPS) does, the purpose is to use information given in GSM and Wifi beacon frames (such as timestamps, emitted and received power) and triangulation techniques. Main scientific issues are ambitious as problems of synchronization with the DTOA method (measured values are of the order of the nanosecond); multipath effects and possible difficulties in identifying the direct path; hybridization brings a complex theoretical problem: find a way to best mix several kinds of measurements (such as GNSS pseudoranges, received powers or times of arrival) by automatically assigning a reliability index to these measurements. The aim of this paper was to propose a way of improving the positioning performance of the GNSS system through hybridization with distances derived from GSM power measurements. Both GNSS and GSM measurements were generated using simulation models. The algorithm chosen to perform the hybridization is a particle filter. Simulations showed that while accuracy can only be slightly improved, a position solution can be obtained even when the GNSS system is not available, thus considerably improving availability. Urban scenarios are now under study. In such a context, GSM channel becomes more complex since multipath cannot be disregarded but this drawback can be mitigated by a higher density of BTS in urban environment.


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    Title :

    Improving vehicles positioning using wireless telecommunication media and GNSS hybridization


    Additional title:

    Verbesserung der Erkennung des Fahrzeugstandortes mit Hilfe drahtloser Telekommunikations- und GNSS-Hybridsystem


    Contributors:
    Bonacci, D. (author) / Chauvet, W. (author) / Paimblanc, P. (author) / Castanie, F. (author)


    Publication date :

    2008


    Size :

    6 Seiten, 8 Bilder, 9 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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