Abstract
The European cargo transfer vehicle ATV will perform an autonomous docking to the International Space Station (ISS). This mission represents from position control point of view a very complex problem, that gather huge constraints on performances but also on safety and validation level.This paper shall focus on the design and validation of the ATV position control loop used for final approach and it is organised as follows. The general problem of ATV to ISS docking is first described, and especially the different Guidance, Navigation and Control (GNC) functions requirements as well as the environmental perturbations likely to disturb it. In a second part, discrete H∞ control approach is applied to the position control loop. Methodology, design and tuning are then fully described and illustrated with ATV application. At last, frequencial validation is presented. Then, GNC algorithms performances are presented to show their compliance with the requirements.
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