ROBUST FAULT TOLERANT CONTROL WITH SENSOR FAULTS FOR A FOUR-ROTOR HELICOPTER

This paper considers the control problem for an under actuated quadrotor UAV system in presence of sensor faults. Dynamic modelling of quadrotor while taking into account various physical phenomena, which can influence the dynamics of a flying structure is presented. Subsequently, a new control strategy based on robust integral backstepping approach using sliding mode and taking into account the sensor faults is developed. Lyapunov based stability analysis shows that the proposed control strategy design keep the stability of the closed loop dynamics of the quadrotor UAV even after the presence of sensor failures. Numerical simulation results are provided to show the good tracking performance of proposed control laws