Sliding-mode guidance law based on adaptive observation techniques

Because some feedback quantities such as high-order line-of-sight rate derivatives are not directly measurable and some inner parameters exist uncertainties, sliding-mode guidance law considering the control loop dynamics goes against the practical application in general. Based on adaptive control and observation techniques, a novel observer-based adaptive sliding-mode guidance law is presented. The observer can realize the on-line estimate of the system states and uncertainties. The nonlinear system simulations show that compared with the traditional proportional navigation and sliding-mode guidance law, provided an enough maneuvering capability exists, this guidance law can not only realize the hit-to-kill of the target, but also has the advantages of maneuvering and homing performance.