气动引力辅助的火星自由返回轨道设计方法

Design of Mars Free Return Trajectories with Aerogravity Assist

为更准确地描述大气飞行过程,提出一种三段式大气飞行模型,将大气飞行段分为下降段、平飞段和上升段,使用大气飞行角和航迹角描述飞行过程,并建立了相应的计算模型。对"地球-火星-地球"、"地球-火星-金星-地球"和"地球-金星-火星-地球"自由返回轨道序列的优化结果表明,三段式模型可以准确描述气动引力辅助过程,同时气动引力辅助技术可以有效提升自由返回轨道性能,如减少转移时间,降低燃料消耗等。

To describe the flight profile more accurately, a three-phase atmospheric flight model is proposed in which the atmospheric flight is divided into the descent phase, the level flight phase and the ascent phase, and is described by the atmospheric flight angle and flight path angle. Corresponding computation models are established. The optimization results of the 'Earth-Mars-Earth', 'Earth-Mars-Venus-Earth', 'Earth-Venus-Mars-Earth' free return trajectories show that the three-phase model accurately describes the AGA process and AGA effectively improves the performance of the free return trajectories, with the benefit of the reduced transfer time and fuel consumption.