An Analytic Solution of Entry Trajectory Based on Dynamic Pressure Planning

An analytic trajectory solution based on dynamic pressure planning is presented for the gliding entry of lift-body. Firstly, the equations of motion are transformed from velocity to dynamic pressure and from time to altitude. An analytic method is proposed to calculate the trim angle-of-attack and other trajectory parameters based on dynamic pressure profile. Secondly, according the flight characteristics the entry is divided by initial descent and equilibrium glide. The dynamic pressure of equilibrium glide is scheduled and the geometric trajectory is calculated. Lastly, the simulation result shows that the trajectory design method is well satisfied the requirement of gliding entry.