Discrete‐Time Super‐Twisting Guidance Law with Actuator Faults Consideration

Abstract

AbstractThis paper proposes a robust fault‐tolerant guidance law against unknown maneuvering targets based on discrete‐time sliding mode control theory. To address this problem, a time‐delay observer is designed to estimate the lumped disturbance, which includes target maneuver as well as actuator faults. A robust discrete‐time guidance law is then synthesized based on the discrete‐time super‐twisting algorithm. Due to the principle of the super‐twisting algorithm, the presented guidance law is a naturally chattering‐free formulation. Detailed stability analysis shows that the line‐of‐sight angular rate under the proposed guidance law can be stabilized in a small region around zero. Simulation results are also provided to verify the effectiveness of the proposed approach.