CAJ | 학술논문

以小天体伴飞附着任务为工程背景，针对探测器在小天体复杂弱引力场条件下附着这一难题，研究了最优制导控制策略。首先，考虑在小天体极区实施附着任务，建立并简化动力学模型，给出约束条件和基于时间燃耗最优的混合性能指标要求。然后，采用相平面法设计了最优制导律，利用极限环设计最优开关控制律；同时，采用高斯伪谱法把附着小天体的最优制导问题转化成非线性规划问题，利用 Matlab/GPOPS 优化工具包求取最优数值解。最后，加入已有的基于矢量测量的自主光学导航模块构建 GNC 仿真回路，对两种最优制导控制策略进行仿真验证。结果表明：两种制导控制策略都能满足任务要求，但基于相平面法得到的最优制导控制具有一定风险，而基于高斯伪谱法得到的最优制导控制精度更高、燃耗更少，适于工程应用。
이소천체반비부착임무위공정배경，침대탐측기재소천체복잡약인력장조건하부착저일난제，연구료최우제도공제책략。수선，고필재소천체겁구실시부착임무，건립병간화동역학모형，급출약속조건화기우시간연모최우적혼합성능지표요구。연후，채용상평면법설계료최우제도률，이용겁한배설계최우개관공제률；동시，채용고사위보법파부착소천체적최우제도문제전화성비선성규화문제，이용 Matlab/GPOPS 우화공구포구취최우수치해。최후，가입이유적기우시량측량적자주광학도항모괴구건 GNC 방진회로，대량충최우제도공제책략진행방진험증。결과표명：량충제도공제책략도능만족임무요구，단기우상평면법득도적최우제도공제구유일정풍험，이기우고사위보법득도적최우제도공제정도경고、연모경소，괄우공정응용。
The issue of spacecraft attaching to a small body with complex weak gravitation field is challenging. In this paper,two optimal guidance control strategies are addressed with the mission background of accompany flight and attaching to a small body. First, taking the attaching mission in polar area of small body into consideration,dynamics model is constructed and simplified,as well as the constraints and time-fuel integrated optimal performance index is described.Secondly,phase plane method (PPM)is used to design optimal guidance, and optimal on-off control is given by limit circle.Next,Gauss pseudospectral method (GPM)is utilized to transform optimal guidance problem into nonlinear program (NLP)problem,and MATLAB/GPOPS optimal tool software package is utilized to obtain the numerical solution of guidance.Finally,the vector measurement based autonomous optical navigation given in the previous work is introduced to GNC simulation loop,and the two optimal guidance control strategies are verified.Simulation results show that both of them meet the requirement of mission, but the phase plane method based optimal guidance control is a little risky,while the Gauss pseudospectral method based optimal guidance control has a lower fuel consumption and higher accuracy,so the latter is feasible for engineering practice.