Proposal of a High Precision Orbit Design Method for Multiple Swingby Sequences

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  • スウィングバイ軌道における高精度軌道設計方式の提案
  • スウィングバイ キドウ ニ オケル コウ セイド キドウ セッケイ ホウシキ

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In recent deep space mission analyses of artificial satellites, multiple swingby maneuvers using gravity assists become more important. Because of fuel limitation due to weight constraint on these satellites, a high precision optimal trajectory analysis is required to minimize total impulsive ΔV for trajectory control.<br>This multiple swingby trajectory analysis is formulated as a nonlinear parameter optimization problem. The difficulty of this problem is caused by the unstable convergence due to a non-linear gravity effect, because swingby trajectories must pass close to the gravity resources.<br>In this paper, a new optimization procedure for high precision multiple swingby trajectories is proposed, which uses the patched conic method in an iteration scheme to calculate the non-linear characteristics expressing a gravity effect precisely. The simulation results of a double lunar swingby trajectory show that the proposed method is effective for a multiple swingby trajectory analysis from the viewpoints of computation time and total ΔV for trajectory control.

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