Design And Development Of Semi-Strapdown Optical Stabilization Tracking Control System

The accuracy of missile guidance depends on the performance of the seeker,and external disturbances during the guidance process will reduce the performance of the seeker.In order to isolate this disturbance,it is necessary to select appropriate stabilization technology.Considering the design of miniaturization and light weight,this project uses semi-strapdown stabilization technology to achieve stable tracking function.This stabilization technology installs the rate gyro on the missile body,and realizes the stable tracking function of the seeker’s optical axis through complex mathematical operations.Compared with the traditional direct stabilization method,the semi-strapdown stabilization method is a relatively new type of digital technology and has gradually become the focus of the development of seeker technology.In this paper,based on the development of an optically stable tracking control servo system,the factors affecting the stability performance of the semi-strapdown are studied,and the practicability of the matching filter and the tracking differentiator in this project is verified by combining the actual project data.The thesis first designs the overall scheme of the system according to the project requirements and the selected three-closed loops servo control method.Then,according to the load conditions used in the project,appropriate components are selected and the design of the circuit part is completed.In order to ensure the feasibility of the overall scheme,the loop control is modeled and simulated,and the control performance of the three-closed loops is analyzed.On this basis,join the stability ring to achieve project stability requirements.Aiming at the structure of the stable platform in the project,using the method of rotating and transforming the space coordinate system,the expression equations for the components of the azimuth and pitch axis angular velocity of the stable platform in the optical axis are derived.According to the semi-strapdown stabilization principle,the stabilization method of the semi-strapdown stabilization platform is analyzed,and the angular velocity compensation method is selected according to the project requirements.And through modeling and simulation experiments,the feasibility of the angular velocity compensation method is verified.In order to improve the performance of the optical stabilization tracking system,the paper further analyzes the factors that affect the performance of the semi-strapdown stabilization control.By designing a matched filter,the problem of mismatch between the inertial link and the speed measurement link is solved,and the decoupling performance of the system is improved.Aiming at the problem of differential speed measurement noise,the tracking differentiator is analyzed and designed,and the effects of different filters are selected and analyzed,which improve the stability of the semi-strapdown.Finally,the software requirements are analyzed,and the development of the software part of the system is completed according to the design of the system scheme.As the servo control software is relatively complex,the idea of sub-modules is adopted to design,and the design and development of communication modules,self-checking modules,and main functional modules and so on are completed in turn.On the basis of the completion of the software and hardware development,a joint test and debugging is carried out.During the debugging,the unreasonable design of the interrupt part of the driver software is discovered.After thinking,the difficulty in the design of the driver part is solved.Through continuous debugging and improvement,the functional requirements of the semi-strapdown stable tracking system have been achieved,and the performance indicators of the project have been met,and the design and development of the semi-strapdown optical stable tracking control system has been completed.In addition,the software part realizes the matched filter and the tracking differentiator,and combined with the data information during the project debugging,the performance tests of the matched filter and the tracking differentiator are carried out respectively,and the feasibility of the two in this project is analyzed.