The Airborne Wind Energy paradigm proposes to generate energy by flying a tethered aircraft across the wind flow. Accurate models for tethered flight are essential for the control and optimization of airborne wind energy systems. This paper proposes an estimation of the aerodynamic roll damping of a tethered aircraft based on Inertial Measurement Unit data only, gathered at a high aircraft angular velocity. The resulting system dynamics are nonlinear and the estimation problem is non-convex. Because the aircraft is subject to disturbances, the perturbations are estimated alongside the uncertain parameters. In order to handle the unstable aircraft dynamics, a discretization of the model equations based on multiple-shooting is proposed.
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