Abstract
Abstract CARINA is a new retrievable unmanned capsule designed by ALENIA SPAZIO under ASI (Agenzia Spaziale Italiana) contract. This paper deals with the operative attitude acquisition phase and the operative phase of its life cycle. In the operative phase the control system must assure microgravity requirements. Two different type of actuators are used for the two different phases: 20N hydrazine thrusters for the first, magnetic coils and a reaction wheel for the second, and, consequently, two control systems techniques are used. The former is based on a new discrete time modeling of the system due to the PWM-like behaviour of the thrusters and results in a discrete controller able to guarantee robustness against parameter uncertainties. The latter is a scheduling technique based on a LOR approach and guarantees the fulfilling of microgravity requirements. All the simulations, performed on the ESA-MIDAS dynamics simulator, take into account atmospheric drag, solar pressure and gravity gradient disturbances, and show the effectiveness of the adopted approach.
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