基于伪谱法的亚轨道返回轨迹在线重构方法  

On-line trajectory reshaping of suborbital return entry via pseudospectral method

作　　者：解永锋[1] 唐硕[1] 

机构地区：[1]西北工业大学航天学院,陕西西安710072

出　　处：《飞行力学》2011年第6期63-67,共5页Flight Dynamics

摘　　要：任务目标的多样化要求亚轨道飞行器具备在线重构能力。根据飞行器当前飞行状态以及终端约束条件,使用勒让德伪谱法进行在线轨道重构,生成满足各种轨道约束的最优返回轨迹,并实时反馈更新当前轨道控制量迎角和倾斜角,达到实时最优闭环制导的目的。轨道重构的实时性可采用无量纲化、Bootstrap串行优化、弹性约束和自适应反馈更新等策略加以保证。仿真结果表明,在线轨道重构可以满足实时性要求,即使出现严重的阵风干扰,也能达到所要求的终端约束条件,并且制导指令不会出现增加控制难度的剧烈抖动现象。Multi-missions of Suborbital Reusable Launch Vehicles require on-line reconfiguration capability.In this paper,Legendre pseudospectral method is used for on-line trajectory reshaping based on current flight conditions,final flight conditions and various path constraints.Trajectory controls including angle of attack and bank angle can be updated through real-time feedback to achieve on-line real-time optimal closed-loop guidance.Real-time capability of trajectory reshaping can be guaranteed through dimensionless,Bootstrap serial optimization,elastic constraints and adaptive feedback update.Simulations show that on-line trajectory reshaping can satisfy real-time requirement and can compensate for large uncertainties and disturbances including severe-case wind gust.It is also shown that chatter in guidance commands can be eliminated by elastic constraints.

关 键 词：亚轨道 轨道重构 勒让德伪谱法 闭环制导 

分 类 号：V412[航空宇航科学与技术—航空宇航推进理论与工程]