Design And Research Of Servo Control System For Seeker Stable Platform

In the local war,precision strike has become the main military means.In the same time,as one of the most important means of precision strike,precision-guided weapons play an important role in the local war.Considered as an indispensable part of the precision guidance weapon,the missile seeker is paid more and more attention.Its main function is to complete the autonomous search,recognition and tracking of the target,to output the real –time control signal of the guidance law,and to stabilize the effect of the disturbance of missile body on the loop to ensure the missile flying to the target.The stable platform is also known as the core technology of the seeker.It provides a stable,reliable and accurate working environment for the seeker to isolate the missile disturbance and ensure the accurate tracking of the seeker to the target.In this paper,the stable platform of laser seeker is the object of the research including the overall scheme design,the stability tracking principle,the control algorithm,the hardware design and the software design.Firstly,the structure and function of the seeker were introduced,as well as the overall design schemes of the stable platform.In addition to the various components of the system and its function,the principle of stable platform control is analyzed.And the control method was presented.Secondly,a detailed description of the servo system design was presented,including the selection of executive components and measurement feedback components,the design of the servo control scheme,the design of PID control algorithm as well as lead and lag correction,the development of DC torque motor mathematical model,the accomplishment of the current loop,speed loop and position loop modeling and simulation as well as isolation simulation.At the same time,according to the predictive function control algorithm presented,the speed loop controller of the servo system was designed.Comparing the simulation experiment of predictive function control algorithm with the traditional PID control algorithm,the experimental results were studied.Thirdly,the hardware design of the servo control system was introduced,which included the master chip selection,ARM minimum system design,current sampling circuit design,communication circuit design,the introduction of H bridge motor drive principle and work logic as well as the description of H bridge dead zone problem and the solution to the problem.Finally,the design of servo control system software was introduced.The software design adopted the modular design method,including the main function design,the interrupt service function design,the serial communication function design and the PWM wave function design.This part also included the upper computer compiler environment LabWindows / CVI,lower computer compiler environment MDK,and principle and the generation process of PWM wave modulation.