FAULT TOLERANT FLIGHT CONTROLLER FOR A HIGH PERFORMANCE FIGHTER AIRCRAFT DURING AUTO-LANDING

摘要

In this paper the auto-landing problem of a high performance fighter aircraft has been addressed. During landing, the flight path consists of flight segments such as a wing-level flight, a coordinated turn, glide slope descent and finally the flare maneuver and touchdown on the runway. The trajectory segments corresponding to these phases have to be flown in the presence of severe winds. A detailed description of the wind model is also being considered. These tend to cause deviation of the aircraft from the specified trajectory. However, it has to be ensured that all trajectory deviations are within specified limits. The touch conditions are given with tight specifications, named for convenience as the touch-down pill box. The controller is first designed to meet all these specifications for all these phases under no failure conditions of the actuators. We then augment the controller to be able to handle the same flight segments but with the occurrence of certain failure conditions of the actuators.