This paper describes the detailed investigations on control matters regarding simultaneous translational and rotational 6 degree of freedom relative motion between two spacecraft with an arbitrary pointing. The controller design and analysis have been based on modern Multi-Input Multi-Output (MIMO) control methods, which have two clear advantages: first, the controller can be designed such the stability and robustness of the system are ensured and, second, the controller characteristics can be analyzed using the powerful state-of-the-art MIMO tools. After reviewing different MIMO control design techniques, four were selected as the most promising ones, trying to cover, as much as possible, the complete spectrum of possible MIMO techniques: Pole-placement and LQG/LTR as representative of the 'classical' MIMO and LQG/LTR as representative of the 'classical' MIMO techniques and H(vers infinity) Synthesis and my-Synthesis as the state-of-the-art MIMO design techniques. For the investigations, the ATV-ISSA RVD mission was selected as baseline. This paper describes the application of these MIMO design techniques to two representative GNC modes, covering different motions (forced approach and station keeping), references (with respect to the target local orbital frame and docking frame) and target attitudes (Earth pointing, Sun-pointing).
MIMO control for 6DoF relative motion
MIMO-Steuerung für ein Stellsystem mit 6 Freiheitsgraden zur Bestimmung der Position zweier Raumfahrzeuge zueinander
1997
11 Seiten, 20 Bilder, 1 Tabelle, 7 Quellen
Conference paper
English
MIMO Control for 6DoF Relative Motion
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