Research on Optimal Trajectory of Reusable Boost Vehicle

On the basis of review of trajectory optimization method at home and abroad,a method that attitude-adjusting return phase and reentry phase were optimized separately was proposed aiming at Reusable Booster Vehicle(RBV) flying with large angle of attack and a wide-angle return.The direct shooting method and sequential quadratic programming algorithm were used to solve the optimization problem.The pitch angle was taken as optimal control quantity.Transition speed and path angle were analyzed,and the optimal transition speed and path angle were obtained.The whole trajectory from separation point to the end point of reentry of reusable booster vehicle was optimized,and the optimal trajectory was obtained.Simulation results show that an optimal trajectory which satisfies trajectory constraints well can be obtained by the optimization strategy.