Design Optimization of Space Debris Decent Trajectory Considering Land Security by Evolutionary Calculation

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Space debris is artifacts that are dumped into orbit at the end of satellite operations or at the time of rocket launch, and is increasing in number as space exploration becomes more active. Since space debris poses a risk of collision in orbit during the launch of new spacecraft, studies on debris disposal have been active. In addition, orbit design is required so that debris can be disposed of at sea, avoiding land, where unburned debris can cause human and material damage due to the possibility of falling debris. Because debris cannot be actively controlled, it is required to predict the optimal trajectory before the re-entry and to consider the timing and the acceleration for the re-entry. In this report, we simulated the debris trajectory from the re-entry to reaching at the ground surface, and applied the evolutionary algorithm for the maximization of the distances from the reaching offshore point to the nearest coastline, considering as a risk of the ground.