Statistics – Computation
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992git..reptq....m&link_type=abstract
Final Technical Report Georgia Inst. of Tech., Atlanta. School of Aerospace Engineering.
Statistics
Computation
Aeroassist, Dynamic Control, Nonlinear Feedback, Nonlinearity, Orbit Transfer Vehicles, Spacecraft Guidance, Atmospheric Models, Boundary Conditions, Drag, Fuel Consumption, Lift, Orbital Elements, Planetary Atmospheres, Thrust, Transfer Orbits, Transferring
Scientific paper
Aero-assisted orbit transfer vehicles have the potential for significantly reducing the fuel requirements in certain classes of orbit transfer operations. Development of a nonlinear feedback guidance law for performing aero-assisted maneuvers that accomplish simultaneous change of all the orbital elements with least vehicle acceleration magnitude is discussed. The analysis is based on a sixth order nonlinear point-mass vehicle model with lift, bank angle, thrust and drag modulation as the control variables. The guidance law uses detailed vehicle aerodynamic and the atmosphere models in the feedback loop. Higher-order gravitational harmonics, planetary atmosphere rotation and ambient winds are included in the formulation. Due to modest computational requirements, the guidance law is implementable on-board an orbit transfer vehicle. The guidance performance is illustrated for three sets of boundary conditions.
Menon K. A. P.
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