The future direction of space transportation systems involves the development of a reusable car-rier capable of horizontal takeoff and landing.Aiming at the characteristics of multiple constraints and large variation in dynamic and mass characteristics of the combined power vehicle using pre-cooling air tur-bo rocket(PATR)during the air-breathing stage,a trajectory design method based on dynamic pressure-altitude profile is proposed.The particle kinematics equations based on altitude are derived,the trajectory parameter solving process is obtained.The shape of dynamic pressure-altitude profile is determined by in-tegrating constraints from dynamic pressure,angle of attack,and normal overload,as well as mission windows,resulting in the attainment of the required air-breathing nominal trajectory.On this basis,an altitude-tracking guidance law is designed.The simulation results show that the nominal trajectory meets the requirements of multiple constraints under the influence of various uncertainty deviations during the air-breathing stage,which has strong robustness.
Trajectory designAir-breathing stageCombined power vehicleDynamic pressure profile
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