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针对具有过程约束和终端状态约束的大气层内空天飞行器上升段制导问题,给出了一种基于伪谱法的固定采样非线性实时最优制导算法,通过连续在线计算开环最优控制的方式提供闭环反馈。针对闭环最优制导过程中首次轨迹优化时的初始猜测问题,提出了采用运载火箭真空段飞行最优上升轨迹作为大气层内最优上升轨迹的初始猜测,改进了初次轨迹优化的初始猜测过程中,直接采用伪谱法进行计算导致的计算速度过慢的缺点。仿真结果表明,该实时最优制导算法能有效地抑制飞行过程中不确定性和扰动的影响。
Aiming at the asymptotic guidance of aerospace airspace with guidance constraint and end-state constraints, a fixed sampling nonlinear real-time optimal guidance algorithm based on pseudospectral method is presented. By means of on-line continuous open loop optimal control Provide closed-loop feedback. In order to solve the problem of initial guess when the first trajectory is optimized in closed-loop optimal guidance, the optimal guess of the ascending trajectory in the atmosphere is proposed by using the ascending trajectory of the launch vehicle in the vacuum section, and the initial guess of the initial trajectory optimization is improved. The direct calculation using the pseudospectral method leads to the disadvantage of too slow calculation speed. The simulation results show that the real-time optimal guidance algorithm can effectively restrain the influence of uncertainty and disturbance during the flight.