Segmented optimal design of ballistic trajectory of gliding extended range projectile subjected to multiple constraints

Gliding extended range projectile is restricted by such conditions as the speed, the engine thrust force, the engine work time and the impact point speed inclination when attaining the longest range. To simplify the problem and acquire a well-designed trajectory, a phase-based method for optimizing the overall trajectory is presented. The overall trajectory is divided into the boosted phase, the cruise phase, the gliding phase and the terminal guidance phase. After overall consideration of the constraints and index requirements of all phases, different methods were used to optimize each phase, including the optimal angle of firing design, the design for minimizing energy loss, the optimal glide design and the terminal phase dive method, so as to optimize the overall trajectory. Simulation results show that the designed trajectory can meet the design requirements for multiple constraints and achieve the longest extended range as well as 10km~70km whole range coverage. The conclusion is of certain significance in developing rocket projectiles.