红外拦截弹输出反馈制导控制一体化设计

针对采用红外导引头的拦截弹，提出一种基于滑模观测器的制导控制一体化(IGC)控制方法，在导弹的部分状态已知和非匹配不确定性影响下，确保了其高精度拦截效果。首先，由于采用红外导引头的拦截弹的视线(LOS)角速率难以获取，系统将不满足干扰估计的匹配条件，设计了一种新型滑模观测器，通过构造补偿滑模观测器,同时实现导弹的未知状态和干扰的有限时间精确估计。然后，利用未知状态和干扰估计信息，设计反步控制器实现导弹的制导控制一体化，证明了系统的有界稳定。仿真结果表明，本文提出的方法可以获得较小的脱靶量，且对存在的不确定性具有较强的鲁棒性。

An Integrated Design of Output Feedback Guidance and Control for the Interceptor with Infrared Seeker

Based on the sliding mode observer, a method for designing an integrated guidance and control (IGC) law is proposed for a class of interceptors which are equipped with infrared seekers and subjected to the unmatched uncertainties. Since the line-of-sight (LOS) rate is difficult to be measured for an interceptor equipped with an infrared seeker and the IGC systems can not satisfy the common matching conditions required for the disturbance estimation, a novel sliding mode observer is constructed by using a compensated observer to estimate the unknown LOS rate and uncertainties in finite time. With the estimated state and uncertainties, the IGC design based on the back-stepping techniques is proposed to achieve the robust tracking of a maneuvering target, even if the interceptor contains uncertainties and is subjected to disturbances. The stability analysis of the closed-loop system is also conducted. Numerical simulations demonstrate the effectiveness of the approach proposed.