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为了提高再入制导的适应性和鲁棒性,提出了一种最优预测校正制导方法。根据伪谱方法将再入动力学微分方程约束转换为代数方程约束,将制导问题转换为不需要积分弹道的最优规划问题,利用Gauss伪谱法收敛速度快、精度高的特点,设计了航路点间分段优化的伪谱自适应鲁棒再入制导律,对制导律的特性进行了分析。数值仿真表明,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,仿真表明校正时间很短,具有应用于在线制导的潜力。
In order to improve the adaptability and robustness of reentry guidance, an optimal prediction and correction guidance method is proposed. According to the pseudospectral method, the constraints of reentry dynamics differential equations are transformed into the constraints of algebraic equations, and the guidance problem is transformed into an optimal programming problem that does not require integral trajectory. By using the characteristics of fast convergence and high precision of Gauss pseudospectral method, Pseudo-spectral adaptive Robust Reentry Guidance Law for point-by-point segmentation optimization, the characteristics of guidance law are analyzed. The numerical simulation shows that this reentry guidance law is insensitive to the error of the reentry point and has good robustness. Simulation shows that the calibration time is very short and has the potential of being used in on-line guidance.