Publication

Abstract : This paper proposes a nonlinear scheme for guidance and longitudinal control of Unmanned Aerial Vehicle(UAV). The mainobjective of the guidance algorithm is to minimize the errors in altitude and flight path angle of the vehicle during flight. Theguidance scheme must perform well in the case of small as well as large longitudinal errors, without saturating the pitch angle ofthe vehicle, which act as the control input. Integral Sliding Mode Control(ISMC) is used in longitudinal control of UAV. It is animproved sliding control method. Initially a linear sliding surface is employed for longitudinal guidance but it cannot providesatisfactory performance for both large and small errors in altitude and flight path angle and hence a nonlinear sliding surface isproposed. The simulations are carried out in MATLAB®/SIMULINK®.The simulation results show the effectiveness androbustness of the proposed control scheme.