Query - based Attitude Controlof

In August 1993, heavy meteor activity caused the Olympus telecommunications satellite (S/C) to lose Earth pointing attitude. Automatic emergency reacquisition maneuvers consumed so much propellant that the mission had to be terminated one year ahead of schedule. This paper reexamines the Olympus scenario using a recently proposed adaptive control scheme. The proposed method is a \query-based" adaptive control scheme which uses a cutting-plane algorithm known as the ellipsoid method to identify stabilizing controller gains. This paper demonstrates the query-based adaptation scheme in a detailed simulation of the Olympus satellite. The results show that the proposed method is able to autonomously identify nominal controller gains for the Olympus scenario outlined above.