Robust aircraft control design for glideslope capture in windshear using gain scheduling

Abstract

Design of a robust automatic landing controller for the glideslope capture under windshear conditions is presented in this paper. Ha robust technique is employed to develop the necessary formulations for the aircraft control gain. Gain scheduling control inputs are determined so as to recover the glideslope trajectory in all stages of windshear. It is shown that the aircraft lift affected by the windshear can be separated into three parts: ballooning due to head wind, downburst, and combination of downburst with tail wind. In order to adjust the loss or increase in lift due to windshear, the robust gain scheduling controller is designed based on the change in aircraft lift caused by the windshear. Simulation results show that the glideslope capture of the landing aircraft can be recovered under different kinds of windshear. L INTRODUCTION