临近空间无人飞行器再入轨迹快速优化及跟踪  

Onboard Entry Trajectory Optimization and Tracking for Near Space UAV

作　　者：刘存佳[1] 任章[1] 张庆振[1] 李菁菁[1] 

机构地区：[1]北京航空航天大学自动化科学与电气工程学院,北京100083

出　　处：《系统仿真学报》2009年第7期2033-2036,共4页Journal of System Simulation

摘　　要：为适应临近空间无人飞行器再入返回时高动态、强约束的特点,提出了一种轨迹快速优化方法:将再入参考轨迹优化问题转化为多维非线性规划问题,并通过SQP方法求解。轨迹优化时将参考阻力加速度曲线表示成能量的分段线性函数,并通过推导得到航程预测和总吸热量的解析表达式,避免了传统优化过程中的积分计算,提高了优化速度。轨迹跟踪时采用反馈线性化方法得到制导律,并借助轨迹在线更新技术补偿跟踪误差,使得制导精度大大提高。An online optimization method for generating reentry trajectories was developed to handle the high dynamic and strict constraint accompanying with the near space UAV. The trajectory generation is converted to a nonlinear optimization problem, and solved using SQP method. Analytical expressions of the range to go and the cost, i.e. the accumulated heat load, are obtained. Since no numerical integrations are involved, the optimization is speed is up. A control law based on the feedback linearization method is employed for trajectory tracking. With the help of the trajectory updating scheme during, the reentry, the precision of guidance is promoted remarkably.

关 键 词：轨迹优化 SQP方法 反馈线性化 再入制导 

分 类 号：V249.322[航空宇航科学与技术—飞行器设计]