Method for improved determination of a vehicle attitude...

Details Method for improved determination of a vehicle attitude... Method for improved determination of a vehicle attitude...

G - Physics

01

S

G01S 19/54 (2010.01)

Patent

CA 2470550

The invention concerns a method using at least a pair of antennae, which consists in carrying out: a standardized spectral analysis before intercorrelation of the demodulated signals (I, Q), by the code and the carrier, resetting phase coherence of the signals before recombination, measuring phase difference carried out by a true intercorrelation of homologous satellite paths by interferometry of two signals derived from a common satellite and received respectively by a pair of antennae, then in reducing the search domain of the initial ambiguity removal to determine a vehicle attitude by interferometric GPS measurement and implementing a statistical test for ambiguity selection.

Le procédé conforme à l~invention, mis en oeuvre à l~aide d~au moins une paire d~antennes, consiste à effectuer : une analyse spectrale normalisée avant intercorrélation des signaux démodulés (I, Q), par le code et la porteuse, une remise en cohérence de phase des signaux avant recombinaison, une mesure d~écart de phase réalisée par une vraie intercorrélation des voies satellites homologues par interférométrie des deux signaux issus d~un même satellite et reçus respectivement par une paire d~antennes, puis à effectuer une réduction du domaine de recherche du lever d~ambiguïté initial pour la détermination d~attitude d~un véhicule par mesure GPS interférométrique et mettre en oeuvre un test statistique pour la sélection de l~ambiguïté.

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