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Communication Dans Un Congrès Année : 2009

Systemic interference mitigation with a combined repeater/pseudolite approach for indoor positioning

Résumé

Indoor positioning is a very challenging technical issue. It is also an economical issue in the development of the Location Based Services whose applications have to integrate indoor navigation. In the paper, the proposed approach consists of using kinds of GNSS transponders (called Repealites) deployed as a local GNSS constellation around the considered environment. The idea, first presented in [1]-[2], is to delay the emission in each repealite in such a way that the signals transmitted on each transponder do not theoretically interfere with each other. This means a very light infrastructure deployed since it only consists of an outdoor antenna (or a GNSS signal generator) for the source and cables to provide the transmission of the signal towards the antennas of the local constellation The constellation of Repealites thus obtained has a lower cost than a pseudo-satellite constellation since it does not require synchronization. Moreover, the multipath, second source of error mentioned above, can be mitigated by carrier phase measurement, as it has already been achieved successfully with the pseudolites [3]. However one of the limitation of the pseudolite system remains: the systemic interferences due to the difference of power levels between signals coming from two sources (the so called "near far problem") can be important indoors. So it has to be mitigated. In the pseudolite case, the most common method carried out in order to mitigate the systemic interference consists of pulsed emissions according to techniques developed in [4]. The Repealites give an alternative to pulsed emission: it consists of exploiting the very specific structure of the signal. In the case of the use of a single satellite generator, it is indeed interesting to exploit the fact that the transmitted signal is the same on each repealite of the local constellation. The goal of this paper is to show that accurate indoor positioning (1 to 2 m) can be carried out through code measurement with a very low cost infrastructure, simply by a clever use of the very specific signal structure that delayed transmissions induce.
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Dates et versions

hal-00445860 , version 1 (11-01-2010)

Identifiants

  • HAL Id : hal-00445860 , version 1

Citer

Alexandre Vervisch-Picois, Nel Samama. Systemic interference mitigation with a combined repeater/pseudolite approach for indoor positioning. ITM '09 : The 2009 International Technical Meeting of the Institute of Navigation, Jan 2009, Anaheim, Ca, United States. pp.157-166. ⟨hal-00445860⟩
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