Reference Frames for Spacecraft Dynamics and Control
Reference Frames for Spacecraft Dynamics and Control
Reference Frames for Spacecraft Dynamics and Control
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Earth-Centered Inertial (ECI)• Also called “CelestialCoordinates”• The I-axisis in vernalequinox direction• The K-axisis Earth’srotation axis,perpendicular toequatorial plane• The J-axisis in theequatorial plane <strong>and</strong>finishes the “triad” of unitvectorsÎKˆTowards vernalequinoxĴ
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