Servo Control System Of Fast Streering Mirror DSP

Fast steering mirror(FSM) is one of the optical scanning device,which fastly capture tracking target,lock and automatic track, It is one of the key components applying in laser,radar, adaptive optics,space optical communication and so on. Domestic existing traditional laser scanner due to the combination of the frequency, volume, power consumption,control factors, which cannot meet the requirements of existing high-end application fields for laser scanning.FSM angle is small.Its mechanical time constant is very hard to get with traditional step method. To base on accurate FSM dynamic model reach accurately controller parameters, which affect the system steady state and dynamic feature. In order to solve this problem, this paper presents a frequency domain method obtained the dynamic model, the method of double lag-lead series correction technique is applied to implement the design of servo control system, and experimental is verificated under the main computer guide.Firstly, principle and composition of FSM control system is studied.lt point out FSM dynamic stability tracking algorithm principle, and FSM double closed loop control system simulate by MATLAB.Feasibility of the servo control system is verified in theory, through the installation of the linear grating and angular position code value turning principle analysis constitute a position closed loop of servo control system.Secondly,to design the hardware use high-performance floating-point DSP TMS320F2812,at last, double closed-loop stability control algorithm was realized. On the basis of using CPLD provide selected chip signals, time trigger pulse signal, linear grating trigger signal,it has realized the real-time performance of the servo controller and high integration.Finally,FSM dynamic tracing test is done through the guidance of master control computer,the test results show that the azimuth maximum angular velocity is 10°/s,maximum acceleration is 5°/s and elevator maximum angular velocity is 6°/s.maximum angular acceleration is 5°/s ,dynamic tracking azimuth maximum root mean square error is 1.979250949,the minimum root mean square error is 0.92207,elevator maximum root mean square error is 1.878340134,the minimum root mean square error is 0.67137, it has realized the azimuth and elevator 2 high tracking precision.