| Based on the background of rocket sub-stage reentry,this paper studies the guidance and control technology of rocket sub-stage reentry.For their return flight environment and the rockets in the process of children features,based on the terminal Angle constraint is proposed sliding-mode guidance scheme,design of rocket child return to direct adaptive fuzzy control overload controller,considering the rockets child return to exist in the process of model uncertainty and external disturbance impact on system stability and performance,disturbance observer is designed to enhance the robustness of the control system.The main work of this paper includes:1)Analyze the force and moment of action in the process of rocket sub-stage reentry,and consider the wind interference factors in the flight process,establish the six-degree-of-freedom mathematical model of rocket sub-stage reentry.2)By establishing the atmospheric guidance model,the finite time convergence guidance law can be designed to ensure the terminal position and landing Angle conditions;The second order robust accurate differentiator is used to estimate the total disturbance of the system,which is composed of system deviation,disturbance and parameter uncertainty.3)Build the control model based on the small disturbance linearization theory and state feedback method,and then design the self-adaptive fuzzy overload controller of rocket sub-stage return;The global stability of the overload control system is analyzed.The simulation test and analysis of the control system are carried out based on linearization model,3-dof rotation model around the center of mass and 6-dof guidance model.4)The disturbance observer is designed to obtain the compensation model of the rocket sub-stage return control system,analyze the global stability of the control system,and conduct the simulation comparison with the nominal controller based on the improved rocket sub-stage return overload controller. |
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