DESIGN AN ADAPTIVE FINITE TIME CONTROLLER FOR INTEGRATED GUIDANCE CONTROL SYSTEMS BY USING FINITE DISTURBANCE OBSERVER AND BACKSTEPPING TECHNIQUE

Abstract

A novel control synthesis approach for Integrated guidance and control (IGC) systems in aerial vehicle (AV), based on Finite-time backstepping (FTB) combined with a Finite-time disturbance observer (FTDO) is proposed. Comparing to the conventional backstepping methods ensuring asymptotic convergence, the proposed approach guarantees finite-time convergence and significantly improves disturbance rejection capability. The controller is designed in a strict-feedback structure containing layers employing nonlinear control laws to satisfy Lyapunov stability conditions. Individual FTDOs are constructed for each state equation to accurately estimate the lumped disturbances and enhance compensation performance. Simulation results show that the proposed method shortens transient response time, reduces control errors, and ensures accurate target tracking even under strong disturbance conditions.