Hybrid optimization for multiple-impulse reconfiguration trajectories of satellite formation flying |
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Authors: | Dong-Yoon Kim Byoungsam Woo Sang-Young Park Kyu-Hong Choi |
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Institution: | aAstrodynamics and Control Lab., Department of Astronomy, Yonsei University, Seoul 120-749, Republic of Korea;bDynamics and Control Systems Analysis, Space Systems/Loral, 3825 Fabian Way, Palo Alto, CA 94303, USA |
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Abstract: | A hybrid optimization method is developed for fuel-optimal reconfigurations of a group of satellites flying in formation. The genetic algorithm performs a global search to find two-impulse trajectories, and primer vector analysis finds multiple-impulsive local optimal trajectories with the two-impulse trajectories as initial guesses. Hybrid optimization finds globally optimal trajectories for formation reconfigurations, including formation resizing, reassignment and reorientation maneuvers. Multiple-impulse trajectories reduce the fuel consumption from the two-impulse trajectories by up to 4.4% for those maneuvers. In real missions, satellites can follow two-impulse trajectories to gain the advantage of a smaller number of impulses, with the cost of slightly more propellant. The qualitative characteristics of the optimal trajectories are analyzed from the number of optimal trajectories found by hybrid optimization. |
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Keywords: | Satellite formation flying Relative motion Reconfiguration trajectory Optimal control |
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