Comparison the Performance of an Automatic Landing System
In this research, a combination of fuzzy and classical (PID) controller is used in designing of the longitudinal motion controller for an aircraft. The main purposes in each of these controllers are to reduce aircraft vertical velocity and altitude in glide slope and flare phases. In fact, each longitudinal controller consists of two controllers. The first controller produces required pitch angle for aircraft guidance, to the specified trajectory, and the second one will produce elevator deflections for aircraft rotation to the path. Then, by adding supervisory and adaptive controllers, the stability of the system against severe turbulence will be discussed. Simulation results show that the adaptive controllers can successfully develop the safety envelope to include more hostile environments such as wind disturbances.