末端能量管理段轨迹生成改进算法  

Improved Trajectory Generation Algorithm for Terminal Area Energy Management Phase

作　　者：唐鹏[1] 张曙光[2] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191 [2]北京航空航天大学交通科学与工程学院,北京100191

出　　处：《宇航学报》2009年第4期1340-1345,共6页Journal of Astronautics

摘　　要：改进再入飞行器能量管理阶段轨迹生成算法,以高度为独立变量的三自由度方程为出发方程,根据地面轨迹长度和横侧机动能力确定动压剖面。将迭代算法改进为递推算法,计算不同固定滚转角下所需的纵向指令,使用三步逐点转动地面轨迹的方法依次消除航向角、横程和纵程的终端偏差,最终生成符合飞行器动力学特性的轨迹以及相应的制导指令。三自由度仿真表明:算法合理地考虑了飞行器纵横向耦合的特性,使得生成的轨迹与相应指令相匹配。调整动压剖面有效地改变返场区域,增强了对于初始条件的适应性。Improve trajectory generation Algorithm of the vehicle in the terminal area energy management flight phase. Height is the independent variable of the 3DOF equation, and dynamic pressure schedule is determined by the ground track length and lateral maneuverability. Subsequently, longitudinal command is computed by propagated algorithm substituted for iterative algorithm under series of fixed roll angles. Finally, the flyable trajectory and its commands are generated by turning ground track into three steps, in order to eliminate the error of heading angle, crossrange and downrange. 3DOF simulation shows that： the algorithm can generate the trajectory and compatible commands, because it is considered of the coupling between longitudinal and lateral characteristics. Furthermore, the fly-back area can be adjusted by changing the dynamic pressure schedule, which can adapt for different initial conditions.

关 键 词：能量管理 动压剖面 轨迹生成 三自由度仿真 

分 类 号：V249.1[航空宇航科学与技术—飞行器设计]