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Communication Dans Un Congrès Année : 2009

Indoor carrier phase measurements through GNSS transmitters : theory and first experimental results

Résumé

The repeater indoor positioning system is based on the use of GNSS repeaters in order to provide GNSS availability indoors through the way of an amplification of the signals received on an outdoor (typically on the roof) antenna. The complete system, already described in previous conferences, uses four repeaters in order to provide a full 3D 1 to 2 meter accuracy indoor positioning. The measurements, at the receiver end, are the pseudo-ranges at the instant of transition from one repeater to the next, the transmission being achieved through a sequential scheme (only one repeater transmitting at any given time). This approach implements a sort of "time differential" approach that provides such a good positioning accuracy. Unfortunately, it is not possible to improve this accuracy since the sequential scheme does not allow for carrier phase measurements. The pseudolite system allows such measurements but has the problems of synchronisation (not present in the case of repeaters since we are using the GNSS constellation time) and near-far. Repealites (a shortcut between repeater and pseudolite) is a recent concept under consideration. We still use an identical signal transmitted from all the so-called repealites but which is slightly delayed for each transmitter. The correlation function, at the receiver end, now shows N primary peaks in the case of N transmitting repealites. Interference problems and near-far effects have been addressed in previous papers and we are now interested in the positioning accuracy resulting from carrier phase measurements. The multipath problem, very acute indoors, is dealt with through the use of the SMICL (Short Multipath Insensitive Code Loop) design. Ambiguity resolution and resulting accuracies are presented through both the theoretical and experimental aspects
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Dates et versions

hal-01314871 , version 1 (12-05-2016)

Identifiants

  • HAL Id : hal-01314871 , version 1

Citer

Alexandre Vervisch-Picois, Nel Samama. Indoor carrier phase measurements through GNSS transmitters : theory and first experimental results. IAIN 2009 : 13th World Congress of the International Association of Institutes of Navigation, Oct 2009, Stockholm, Sweden. pp.1 - 9. ⟨hal-01314871⟩
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