固体助推飞行器大气层内闭环制导方法

Aiming at the endo-atmospheric guidance for solid-boosted vehicle, an online closed-loop guidance method which can strictly constrain the terminal angle of attack is proposed. To improve the trajectory adjustment ability, a suitable flight profile is selected according to the different effects of control variables to the trajectory. The flight profile with analytic polynomial form is designed, and the terminal attitude constraint is controlled precisely by updating the profile constraint conditions in real time. Within each guidance cycle, the numerical algorithm is used to search profile parameters online to complete profile updating. The actual control variables can be obtained directly, and the constraints of terminal altitude and terminal trajectory inclination can be satisfied, thus creating initial conditions for the subsequent flight of loads. The simulation results show that when the aerodynamic parameters and engine parameters are uncertain, the terminal angle of attack is within the constraint range, the fluctuation is less than 0. 3°, and the height error is less than 10 m, which has strong robustness.