Hybrid inertial navigation unit with enhanced integrity in...

G - Physics – 01 – C

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G01C 21/16 (2006.01) G01C 5/00 (2006.01)

Patent

CA 2468237

The invention concerns inertial navigation units for aircraft. In order to improve altitude measurement accuracy, it consists in associating with the inertial unit (C_INERT) a radio sonde supplying the aircraft altitude (HAUT_ALT) relative to the ground and a terrain database (DTED) supplying a ground altitude (ALT_GND) at the aircraft horizontal position delivered by the inertial unit. The inertial unit supplies an altitude (ALT_HYB) which is corrected on the basis of values supplied by the radio sonde and the terrain database. A protecting radius (RPalt_hyb_cor) of the thus corrected altitude is calculated. For said calculation of the protection radius, it consists in calculating in particular the dispersion of the terrain altitude around the aircraft horizontal position, in a circle delimited from the protection radius of the horizontal position (RPpos_hor_hyb), supplied by the inertial unit simultaneously with the horizontal position.

L'invention concerne les centrales de navigation inertielles pour aéronefs. Pour améliorer la précision de mesure d'altitude, on associe à la centrale inertielle (C_INERT) une radiosonde fournissant une hauteur (HAUT_ALT) de l'aéronef par rapport au sol et une base de données de terrain (DTED) fournissant une altitude du sol (ALT_GND) à la position horizontale (POS_HOR_HYB) de l'aéronef délivrée par la centrale inertielle. La centrale inertielle fournit une altitude (ALT_HYB) qui est corrigée à partir des valeurs fournies par la radiosonde et la base de données de terrain. Un rayon de protection (Rpalt_hyb_cor) de l'altitude ainsi corrigée est calculé. Pour ce calcul de rayon de protection, on utilise en particulier un calcul de la dispersion d'altitude du terrain autour de la position horizontale de l'aéronef, dans un cercle délimité à partir du rayon de protection de la position horizontale (Rppos_hor_hyb) , fourni par la centrale inertielle en même temps que la position horizontale.

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