论文部分内容阅读
对采用直接大气再入方式的月地转移轨道,考虑大气再入界面参数和地面落点位置约束,提出了一种基于双二体模型的快速设计方法。该方法分为内外两层迭代循环,内层循环使月心段轨道和地心段轨道在月球影响球边界处连续,并采用Lambert问题与Newton-Raphson法相集合的方法求解满足再入角约束的地心段轨道参数;外层循环通过调整地心段轨道倾角和轨道置入时间使月地转移轨道满足地面落点位置约束。分析表明,存在四种类型的月地转移轨道满足大气再入界面约束,分别为降-降型、降-升型、升-降型和升-升型。在此基础上,对四种类型月地转移轨道的近地点地心距、置入分布点、再入点分布等特性进行了分析。仿真结果验证了所提出方法的有效性。
Considering the parameters of atmospheric reentry interface and the placement of ground falling point, a fast design method based on double-body model is proposed for the moon-earth transfer orbit using direct atmospheric reentry. The method is divided into inner and outer two iteration loops. The inner loop makes the trajectory of lunar segment and the geocentric segment continuous at the lunar sphere boundary. The Lambert problem and the Newton-Raphson method are combined to solve the problem that satisfies the reentry angle constraint Geocentric orbital parameters; outer circulation by adjusting the geocenter orbit inclination and orbital placement time so that the moon orbit to meet the placement of the ground fall constraints. The analysis shows that there are four types of lunar orbit transitions that satisfy the constraints of atmospheric reentry interface, namely, descending-descending, descending-ascending, ascending-descending and ascending-ascending. Based on this, the characteristics of the perigee distance, the placement point and the reentry point distribution of the four types of lunar transfer orbit are analyzed. The simulation results verify the effectiveness of the proposed method.