An ascent trajectory design method with constant dynamic pressure for RBCC powered vehicle

Rocket based combined cycle( RBCC) powered vehicles generally climb with constant dynamic pressure at ascent stage in order to provide an optimal or steady condition for the propulsion system.An algebraic equation of height and velocity for constant dynamic pressure climbing was derived.The algebraic equation was used to plan and generate the reference trajectory.Then, a guidance law tracking the reference trajectory was derived via feedback linearization method. Based on the above,the guidance method of constant dynamic pressure climbing for ascent stage of RBCC powered vehicle was implemented. The simulation results show that the method is able to generate the command of attack angle in real-time and complete constant dynamic pressure climbing accurately.Furthermore,the method provides an ascent trajectory design and guidance method for air breathing aerospace vehicle.