Testing agile satellite attitude control systems in the FACE laboratory

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Verifying attitude control systems on ground is not an easy task. The free motion of satellites in space can only be simulated for the rotational degrees of freedom. The trick is done by using a spherical air bearing. It allows an almost torque-free, frictionless rotation of a rigid platform which emulates the body of a spacecraft.

If the platform is equipped with sensors and actuators for satellite attitude control, function and performance of the control system can be tested on-ground. Helmholtz coils simulate a magnetic field as in orbit. A spot light simulates the Sun. Balance masses allow to zero the torque from gravity and are used to tune the moments of inertia of the platform.

The video introduces FACE, the Facility for Attitude Control Experiments. It shows a sequence of attitude maneuvers with high angular acceleration and high angular velocity as required from agile satellite attitude control systems. These maneuvers are needed e.g. in Earth observation missions when slewing between different observation targets or when tracking an object on ground while passing over it.

The measurements taken during the maneuvers are also used for determining the moments of inertia of the satellite (platform). For that purpose the change of angular rate of platform with reference to the change of speed of the reaction wheels is observed and interpreted.

German Aerospace Center (DLR)
Institute of Space Systems
Department of Guidance, Navigation and Control Systems

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And what kind of connection is used to connect the "table" to the fixed support?

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