Attitude control method for rocket vertical recovery based on nonlinear model predictive control
For the flight characteristics of strong disturbance,large parameter uncertainty,and high dynamic changes of rocket body attitude dynamics in the vertical landing phase of rocket recovery,a rocket vertical recovery attitude control method based on nonlinear model predictive control is pro-posed.Firstly,the attitude control mathematical model is constructed based on quaternions.Then,the control command is solved under the framework of nonlinear model predictive control,and the feedback correction mechanism and variable time domain strategy are introduced to improve the con-trol accuracy.Furthermore,the disturbance is observed by ESO.The simulation results show that the controller has fast response,high tracking accuracy,and the observer can effectively observe and compensate the disturbance with strong disturbance robustness.
launch vehiclevertical recoverynonlinear model predictive controlattitude control
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