基于伪谱方法的自适应鲁棒实时再入制导律研究

Real Time Robust Adaptive Reentry Guidance Law Based on Pseudo-Spectral Method

为了提高飞行器再入制导的鲁棒性和自适应性,将再入弹道跟踪问题转化为再入弹道状态调节问题,得到了一个LTV系统最优控制问题。在此基础上,利用基于伪谱算法的最优反馈控制算法,设计了一种便于在线实现的自适应鲁棒再入制导律。仿真结果表明,这种再入制导律对于再入点误差不敏感,具有良好的鲁棒性。在气动参数模型存在较大误差的情况下,依然能够取得较高的再入制导精度。它不需要显示增益调度和积分,并且在不同情况下控制结构和参数无需改变。

In order to improve the autonomous,robustness and adaptive of reentry guidance law,the trajectory following problem was transformed into a trajectory state regulation problem,which was a linear time varying system. Based on optimal feedback control algorithm from pseudo-spectral method,an adaptive reentry guidance law,easy to run on board,was investigated. Simulation results indicate that the reentry guidance law is insensitive to reentry point disturbance,aerodynamic parameters disturbance. It has good reentry accuracy even in the case of some large disturbance and needn’t explicit gain schedule and integral while the control scheme and parameters are constant for different circumstances.