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Attitude Determination and Control (ADCS)

Attitude Determination and Control (ADCS). Space Systems Product Development Spring 2001. Olivier L. de Weck Department of Aeronautics and Astronautics Massachusetts Institute of Technology ADCS Motivation Motivation Sensors: GPS, star trackers, limb In order to point and slew optical sensors, rate gyros, inertial systems, spacecraft Attitude Control measurement units provides coarse pointing while Control Laws optics Control provides fine Spacecraft Slew Maneuvers pointing Euler Angles Spacecraft Control Quaternions Spacecraft Stabilization Spin Stabilization Key Question.

Quaternions Pluses If given φ,ψ,θ then a unique orientation is defined Orientation defines a unique dir-cos matrix R Vector properties, commutes w.r.t addition Computationally robust Ideal for digital control implement Minuses Given orient then Euler non-unique Singularity 6 constraints must be met, non-intuitive Integration w.r.t

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