Take-off trajectory optimization of vertical take off and landing UAV

In this paper, the take-off trajectory optimization problem for a new vertical takeoff and landing(VTOL) unmanned aerial vehicle(UAV) is studied. The longitudinal kinematics equation and dynamics equation are established with atmospheric density, earth gravity, engine thrust and aerodynamic parameter. Taking the thrust and rudder angles as the control variables, the optimal objective function of the fuel and distance at the given time is proposed. Based on Legendre Pseudospectral method(LPM) the optimal control is transformed into the parameter optimization problem, and the optimal flight trajectory is obtained. The simulation results verify the correctness and effectiveness of the method.