Performance Analysis of Pre-launch Attitude Compound Control Method Based on Grid Rudder and RCS

Abstract

Based on the feasibility of the pre-launch attitude composite control method based on grid rudder+RCS (Reaction Control System), the anti-interference ability of the single channel and three channel pre-launch attitude composite control methods is analyse by adding interference torque. The results show that the pre-launch attitude composite control method has strong anti-interference ability and can complete the attitude control task of the launch vehicle. The robustness of the composite control method is analysed by introducing the environmental error and aerodynamic coefficient error to simulate the atmospheric environment change of the rocket in the real environment. The results show that the composite control method has good robustness to the atmospheric density change and aerodynamic coefficient error within the control capability range, which further verifies the feasibility and effectiveness of the method. At the same time, the pre-launch attitude composite control method based on grid rudder+RCS is compared with the more mature stable parachute control method and “stable parachute+control platform” control method. The results show that the designed composite scheme has obvious advantages in control accuracy and control speed, and not only realizes three channel closed-loop active control; It can also reduce the height and speed loss of the arrow body, and clarify the advantages of the composite control method.