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http://dx.doi.org/10.5139/JKSAS.2018.46.8.639

Analytical Solution for Attitude Command Generation of Agile Spacecraft  

Mok, Sung-Hoon (Korea Advanced Institute of Science and Technology)
Bang, Hyochoong (Korea Advanced Institute of Science and Technology)
Kim, Hee-Seob (Korea Aerospace Research Institute)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.46, no.8, 2018 , pp. 639-651 More about this Journal
Abstract
An analytical solution to generate attitude command profile for agile spacecraft is proposed. In realistic environment, obtaining analytical minimum-time optimal solution is very difficult because of following constraints-: 1) actuator saturation, 2) flexible mode excitation, 3) uplink command bandwidth limit. For that reasons, this paper applies two simplifications, an eigen-axis rotation and a finite-jerk approximated profile, to derive the solution in an analytical manner. The resulting attitude profile can be used as a feedforward or reference input to on-board attitude controller, and it can enhance spacecraft agility. Equations of attitude command profile are derived in two general boundary conditions: rest-to-rest maneuver and spin-to-spin maneuver. Simulation results demonstrate that the initial and final boundary conditions, in terms of time, attitude, and angular velocities, are well satisfied with the proposed analytical solution. The derived attitude command generation algorithm may be used to minimize a number of parameters to be uploaded to spacecraft or to automate a sequence of attitude command generation on-board.
Keywords
Attitude Command Generation; Analytical Solution; Agile Spacecraft; Attitude Control; Feedforward;
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Times Cited By KSCI : 1  (Citation Analysis)
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