Dynamic bias for orbital yam steering

B - Operations – Transporting – 64 – G

Patent

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B64G 1/28 (2006.01) B64G 1/36 (2006.01) G05D 1/08 (2006.01)

Patent

CA 2194252

A method and apparatus for steering a low-earth- orbit communication satellite requiring sun-orientation for solar-power accumulation is disclosed. Momentum-bias both maintains nadir pointing and adds yaw-steering moments for sun-tracking attitude control, simultaneously. The method has two principal steps: 1) open-loop momentum decoupling, for correcting the calculated steering torque, and *closed-loop attitude compensation, to correct for perturbations about the calculated attitude in accordance with one of two control law definitions. This combines the advantage of stable gyroscopic attitude control with those of open-loop yaw steering.

L'invention divulguée porte sur une méthode et un appareil servant à piloter un satellite de communication à orbitre terrestre basse qui doit être orienté vers le soleil pour son alimentation en énergie solaire. L'application d'impulsions permet de maintenant le pointage nadiral tout en a joutant simultanément des moments de politage en lacet pour contrôler l'attitude de poursuite du soleil. La méthode comporte deux opérations principales : 1) un découplage des impulsions en bouche ouverte pour corriger le couple de pilotage calculé, et 2) une correction d'attitude en boucle fermée pour compenser les perturbations par rapport à l'attitude corrigée selon l'une de deux définitions de loi de commande. La méthode permet donc d'obtenirune commande gyroscopique stable de l'attitude tout en conservant les avantages du pilotage en lacet en bouche ouverte.

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