红外拦截弹输出反馈制导控制一体化设计

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.