Abstract
This paper presents the automatic control of the aircraft in the longitudinal plane during the landing process, taking into account the wind shear and sensor errors. Two automatic landing systems (ALSs) are designed. The former uses an instrument landing system (ILS), whereas the latter controls flight altitude using the state vector. Both systems have a subsystem for the control of longitudinal velocity that is based on the dynamic inversion theory. The subsystems for pitch-angle control use proportional-derivative (PD) control laws or a law based on the dynamic inversion theory and a proportional-integral-derivative (PID) controller. The slope and flare controllers are a PD controller and a PID controller, respectively. The controllers are designed in both classical and fuzzy-logic approaches. Theoretical results are validated by numerical simulations in the absence or presence of wind shear and sensor errors. Analysis of the time evolution of the main ALS parameter leads to conclusions regarding the superiority of the dynamic qualities for the ALS with fuzzy controllers.
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