Orbital pursuit-evasion hybrid spacecraft controllers
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2015, E-flow American Institute of Aeronautics and Astronautics (AIAA). All rights reserved. Motivated by the increasing potential for military activities in space to be contested by an adversary, the pursuit-evasion (PE) game in an orbital environment is considered. Past research has focused on finding a computationally efficient solution to the differential game. Here, hybrid controllers are considered in order to balance other mission needs inherent to the spacecraft. A sensitivity-based means of traversing the solution space is shown, as well as a means of identifying proximity to barrier trajectories. An example hybrid controller is then described, in which a pursuer or evader spacecraft performs a primary mission while maintaining the game value function above or below specified values. A numerical simulation with both the pursuer and evader implementing forms of this controller is shown. The hybrid controller uses various data stemming from the differential game solution, beyond the computed optimal controls themselves, as inputs to the control decision.
