Preliminary Design and Characteristic Analysis of Moon-to-Earth Transfer Trajectories
2011, 31 (3):
With the constraints of atmosphere reentry interface parameters and the landingpoint location,a method was proposed for the preliminary design of the moon-to-earth trajectory with direct atmosphere reentry. The method included two stages of iteration loops. The inner loop made moon-center orbit and earthcenter orbit continuous at the boundary of the moon influence sphere. To solve the earthcenter orbit parameters meeting the reentry angle constrain, a method combined Lambert problem and Newton-Raphson method was adopted. The outer loop made the moon-to-earth trajectory meet the landing-point location constrain by adjusting the launch time. The analysis shows that four types of moon-to-earth trajectories meet atmosphere reentry interface parameters. The four trajectories are descent-descent trajectory, descentascent trjectory, ascentdescent trajectory and ascentascent trajectory. Then the characteristics of the transfer trajectories were analyzed, such as the perigee geocentric distance, the transfer orbit insertion point distribution, the reentry point distribution. Simulation results indicate that the preliminary design method is effective.
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