The Research On Integrated Guidance And Control Based On Terminal Sliding Mode

In the terminal guidance stage of the strike interception mission,the vehicle is fast,the projectile-target relative distance is close,the coupling between the guidance loop and the control loop becomes stronger,and the design of the two loops separately will cause the delay and precision of the control.In this paper,aiming at the attack interception task in terminal guidance stage,the integrated design method of guidance and control is adopted,which mainly includes the following contents:1?Under the condition of considering the uncertainty of the target acceleration and the uncertainty in the modeling of the attitude motion of the aircraft,the relative motion model of the flight is established,and the relative motion model in the longitudinal plane is obtained under the assumption that the rolling is stable.2?In this paper,a non-singular terminal sliding mode control strategy is proposed to solve the common integrated design scheme of guidance and control,as well as the possible problems in terminal guidance.At the same time,in order to achieve positive strike,the corresponding control quantity and state quantity are determined.In order to compensate the uncertainty introduced in the modeling,a second-order observer is introduced to compensate the disturbance uncertainty.Based on the sliding mode and observer of nonsingular terminal,the control law of guidance and control integration is designed.3?In order to reduce chattering and control accuracy,a double-layer adaptive design scheme is proposed,which does not require any prior assumptions of disturbance uncertainty,and enhances the robustness of the system to a certain extent.At the same time,due to the change of control gain with uncertainty disturbance,the control buffeting is reduced to a certain extent.Combined with the actual model,the design scheme of terminal sliding mode plus observer in the inner loop is replaced,and the corresponding control law is given.4?Finally,based on the corresponding data,the simulation is carried out on the assumption that the upper bound of disturbance exists,the observer is used,and the twolayer adaptive scheme is used.The validity of the designed method is illustrated by the comparison among the three methods.And corresponding advantages.