SPECS 2004 Dynamics and Control Control modes: (1)

SPECS 2004 Dynamics and Control Control modes: (1)

SPECS 2004 Dynamics and Control Control modes: (1) Orbit insertion (2) Acquisition (3) On-station Determined by: mission requirements, mission geometry, insertion type Design Issues: - How are control modes related to spacecraft configuration, deployment, etc. - Must quantify control needed in each option to compare with others. SPECS 2004

Dynamics and Control 2 Main spacecraft configurations: Side Mirror Spacecraft (MSC) Side Central Spacecraft (CSC)

Top Top SPECS 2004 Dynamics and Control 2 Main spacecraft configurations: Stack SPECS 2004 Dynamics and Control 2 Main spacecraft configurations: Hinge

SPECS 2004 Dynamics and Control Control modes: (1) Orbit insertion Upper stage does transfer burn If 3-axis control: If Spin stabilized: Upper stage despins (yo-yos) and separates

Upper stage separates Can further reduce spin by deploying solar panels, etc. Can control spin by deploying solar panels, etc. SPECS now 3-axis controlled SPECS now spin stabilized SPECS 2004

Dynamics and Control Advantages of spinning: - formation must spin for most of life. - almost constant mission geometry from Earth region to L2. - potential control savings? Disadvantages of spinning: - Earth/Sun pointing during early mission phase more difficult (Acquisition). - deployment while spinning more difficult

(Stack) SPECS 2004 Dynamics and Control Spinning? Minor axis? Probably Major axis Major or Minor axis?

SPECS 2004 Dynamics and Control Spinning? Most of life at L2 Sun and Comm directions Possible situation during transfer Comm. vector Sun vector

SPECS 2004 Dynamics and Control Design combinations? 1) Direct transfer, spin stabilized, early deployment or augmented control, likely Hinge type. 2) Phasing loops, 3-axis control, late deployment, Hinge or Stack type, spin-up at L2. 3) Same as (2) but direct transfer

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