Navigation system using hybridization by phase measurements

Details Navigation system using hybridization by phase measurements Navigation system using hybridization by phase measurements

G - Physics

01

S

G01S 5/14 (2006.01)

Patent

CA 2715963

The invention relates to a navigation system for aircraft comprising inertial sensors, a GNSS receiver and potentially a baro-altimeter. The measurements from the inertial sensors are hybridized with the code and phase measurements from the receiver within a main Kalman filter and, possibly, secondary filters. The said measurements are corrected for several types of errors, notably those due to the passage of the satellite signals through the ionospheric layers. The precision of the determination of the position of the aircraft is greatly improved, both in the horizontal plane and in the vertical direction. This is also the case for the corresponding protection radii, which allows margins to be created in order to satisfy the integrity constraints for the navigation solution.

L'invention concerne un système de navigation pour aéronef comprenant des capteurs inertiels, un récepteur GNSS et éventuellement un baro-altimètre. Les mesures des capteurs inertiels sont hybridées avec les mesures de code et de phase du récepteur au sein d'un filtre de Kalman principal et, éventuellement de filtres secondaires. Les dites mesures sont corrigées de plusieurs types d'erreurs, notamment celles dues à la traversée des couches ionosphériques des signaux satellites. La précision de la détermination de la position de l'aéronef est grandement améliorée, tant dans le plan horizontal que dans la direction verticale. C'est également le cas des rayons de protection correspondant, ce qui permet de créer des marges pour la satisfaction des contraintes d'intégrité de la solution de navigation.

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