Redundant system for the indication of heading and attitude...

G - Physics – 01 – C

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G01C 23/00 (2006.01) B64D 43/00 (2006.01) B64D 45/04 (2006.01)

Patent

CA 2605709

A method and an arrangement for synthetically calculating redundant attitude and redundant heading by means of existing data in an aircraft. In one embodiment the heading of the aircraft is available and in another embodiment the heading is calculated from a magnetic heading sensor. When the heading is available (redundant heading) attitude is calculated by weighting together the signals from and angular rate gyros (2) in the aircraft's flight control system, information from air data (altitude, speed, angle of attack) as well as information about heading (redundant heading). When the heading is not available, attitude and heading are calculated in one embodiment with the aid of Kalman filters (11, 22) by weighting together the signals from the angular rate gyros in the aircraft's control system, information from air data (altitude, speed, angle of attack and sideslip angle) as well as information from a magnetic heading detector existing in the aircraft.

Il s'agit d'une méthode et d'un montage pour calculer de manière synthétique l'assiette redondante et le cap redondant, au moyen des données existantes dans un aéronef. Dans une version, le cap de l'aéronef est disponible et dans une autre version, le cap est calculé à partir d'un détecteur de cap magnétique. Lorsque le cap est disponible (cap redondant), l'assiette est calculée en pondérant ensemble les signaux provenant des gyroscopes de vitesse angulaire (2) dans le circuit de commandes de vol, l'information de données aérodynamiques (altitude, vitesse, angle d'attaque), ainsi que l'information de cap (cap redondant). Lorsque le cap n'est pas disponible, l'assiette et le cap sont calculés dans une version, à l'aide de filtres de Kalman (11, 12), en pondérant ensemble les signaux provenant des gyroscopes de vitesse angulaire dans le circuit de commandes de vol, l'information de données aérodynamiques (altitude, vitesse, angle d'attaque et angle de dérapage), ainsi que l'information provenant d'un détecteur de cap magnétique existant dans l'aéronef.

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