UAV Flight Performance Optimization Based on Restart PRP Conjugate Gradient Method

To solve the problem that the integral termination condition of performance index function can not be fixed and to avoid settling high dimensional two-point-boundary-value model, the energy as a new integral variable instead of time variable has been introduced into the flight trajectory optimization. The trajectory optimization model established by energy-state method was transformed to a nonlinear programming problem. Restart PRP conjugate gradient method was proposed to solve the non-quadratic objective function. Finally, simulation is carried out based on an UAV model. The results show that compared with PRP method, the restart PRP method saves fuel by 6.76%, and the flight time of optimal flight vertical profile shortens 6.71%.