基于借力飞行技术的星际多目标交会转移轨道设计

针对深空探测中的转移轨道问题,提出一种星际多目标交会转移轨道设计方法。该方法基于Tisserand原理,采用能量曲线确定交会目标的序列,由Pork-Chop图确定设计参数的可行域和时序,避免了传统方法在交会目标序列和初始轨道段设计中的缺陷。将多目标交会转移轨道设计问题归结为一种非线性多约束多变量搜索寻优问题,通过梯度下降法,选取目标函数的负梯度方向作为每步迭代的搜索方向,逐步逼近目标函数的极小值点,从而使转移轨道优化问题得到简化。最后,将本文的设计方法用于解决欧空局的ROSETTA任务深空转移轨道的设计,设计结果与欧空局公布的结果一致,从而验证了该设计方法的可行性和正确性。

Transfer Trajectory Design of Interplanetary Multiple Objects Encounter Based on the Gravity-Assisted Technology

According to the issue of transfer trajectory in outer space detection,a method of transfer trajectory design of interplanetary multiple objects is proposed.Based on the Tisserand theory,energy curve is adopted to confirm the sequence of object encounter and the Pork-Chop chart is introduced to confirm the feasible field and time sequence in this method,which avoid the limitation of traditional method in designing the sequence of object encounter and initial orbit segment.The transfer trajectory design of multiple objects encounter is regard as an optimization question based on nonlinear multi-restriction and multi-variable.By using the method of grads decline,the negative direction of the grads of objective function is served as searching direction of iteration,and the least volume of objective function is approached step by step so that the issues of transfer trajectory optimization are simplified.Finally,the method of design is applied to resolve the design issues of outer space transfer trajectory in ROSETTA mission,and the result of design is consistent with the results of European Space Agency promulgated,so that the result of simulation demonstrates that the method of design is feasible and correct.