A flight control design of a re-entry vehicle using a double-loop control system with fuzzy gain-scheduling

Abstract

This paper presents a flight control design of an Automatic Landing FLight EXperiment (ALFLEX) vehicle using a double-loop control system (DLCS) with the fuzzy gain-scheduling (FGS) state feedback. The DLCS consists of an inner and an outer loop. The inner-loop control law is designed by the FGS state feedback to guarantee the stability over the entire operating range of the ALFLEX vehicle, while the outer loop control law is designed by a static gain to improve the tracking property. Futhermore, guidance laws for the longitudinal and the lateral directions are included in the control system to navigate the ALFLEX vehicle to a reference trajectory even if the initial condition is deviated from the nominal. The designed DLCS showed satisfactory performance in the numerical simulation of the ALFLEX vehicle.