Abstract:Aiming at the difficulties of high-precision control in the landing phase of the vertical return rocket, an anti drift control algorithm is proposed. Based on the dynamic explicit guidance and PID control, a disturbance observer based on the gyro and tabulated information is designed to estimate the disturbance force and disturbance torque of environmental disturbance, liquid sloshing, structural deviation and model uncertainty. The disturbance force and torque are balanced through swing angle and program angle compensation. The simulation results show that the method is easy to solve and has strong engineering realization; Compared with the traditional control, the anti drift control algorithm has greatly improved the attitude control accuracy, reduced the trajectory drift by more than 50%, providing good support for engineering practice.