Attitude Determination and Control - AGI

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Outline • What is attitude • Representations of Attitude • DCM • Quaternions • How we determine attitude • Absolute attitude sensors • Relative attitude sensors • How we control attitude • Actuators • Stabilization • How this relates to IlliniSat-2 2/14/2011 2
Attitude • Attitude is the orientation of one reference frame with respect to another reference frame. • There are 3 independent quantities in any attitude representation: • Can be represented by a series of three rotations • Can be represented by one rotation about one axis 2/14/2011 3
Page 1: ENG 491CU1 Spring 2011 Erik Kroeker
Page 5 and 6: Direct Cosine Matrix • Direction
Page 7 and 8: Properties of DCM Rotations • DCM
Page 9 and 10: Quaternions • Quaternions are rep
Page 11 and 12: Quaternions • Quaternions can be
Page 13 and 14: Properties of Quaternion • More c
Page 15 and 16: What information is available • O
Page 17 and 18: Absolute Attitude Sensors • Sun-s
Page 19 and 20: Relative Attitude Sensors • Gyros
Page 21 and 22: Errors in Sensing • Pointing Know
Page 23 and 24: Triad Method • In order to take s
Page 25 and 26: Attitude Control • Once we have e
Page 27 and 28: Control Actuators • Momentum Whee
Page 29 and 30: Stabilization • Passive Stabiliza
Page 31 and 32: Attitude Determination and Control

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