Computer Science
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jspro..32..149m&link_type=abstract
Journal of Spacecraft and Rockets (ISSN 0022-4650), vol. 32, no. 1, p. 149-155
Computer Science
Aerocapture, Fuel Consumption, Lateral Control, Moon-Earth Trajectories, Optimal Control, Spacecraft Control, Atmospheric Entry, Deceleration, Impulses, Lift, Off-On Control, Satellite Drag
Scientific paper
Aerocapture is defined as the deceleration of a spacecraft due to drag produced on it by a planet's atmosphere such that the vehicle is captured into orbit about the planet. This is accomplished by varying the direction of the vehicle's lift vector through bank-angle modulation. This paper examines the application of four optimal-control approaches to aerocapture. The first is a minimization of a pseudo fuel cost function, which yields continuous controls. The second is bang-bang control, which minimizes the time associated with bank-angle modulation. Next, an absolute fuel function is minimized, which results in controls in the form of impulses. A fourth approach is a modification to impulsive control, where impulses are approximated by pulses of finite duration. All of the approaches are applied to a single-pass aerocapture problem. The modified impulsive-control approach is applied to a two-pass aerocapture scenario. Recommendations on the practical implementation of these control approaches in the presence of vehicle and atmospheric uncertainties are given.
Meyer J. L.
Silverberg L.
Walberg Gerald D.
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