Design of multiple gravity assist trajectories with deep space maneuver

Planetary swing-by is an effective way to reduce the launch energy for interplanetary exploration missions. However, the traditional swing-by model is difficult to match the relative velocity vector before and after the swing-by. Therefore, the swing-by model was established, and the hyperbolic velocity vector after the swing-by was also derived. Because of the strong coupling of the trajectory design parameters, a global-local hybrid search algorithm was proposed for designing Earth-Venus-Earth-Mars-Jupiter transfer trajectories. All these results certify the effectivity of the proposed model.