Technique Of Stabilized Platform System Based On Fiber Optic Gyro

Along with the increasing of China's military strength, the related areas of military frontier science and technology obtained great enhancement. As an indispensable field of weapon equipment, the gyro stable platform technology has attracted the attention of many researchers and been researched by them. The main function of gyro stable platform is makeing the inertial space of optical axis of the photoelectric device carried by the platform relatively stable through the relative inertial space of the disturbance angular rate of gyro sensitive carrier and constant adjustment of the servo system controller, and implementing different functions,such as detection, tracking and information counter according to different photoelectric equipment carried. In this paper,we designed a stable platform based on fiber optic gyro, did relative research on the fiber optic gyro and platform control system ,and probed into the actual system debugging.The thesis mainly includes:Firstly,this paper introduces the research status of the gyro stable platform and the platform control algorithms in the word; Based on the studying the gyro stable platform control structure, we analyzed the principle of isolation disturbance of stable platform theoretically; This design chose DSP28335 as core control device, selected the related hardware platform system component, and designed and implemented the hardware circuit by cadence software.Secondly, as another core component of the design - fiber optic gyro, the stand or fall of its performance directly affects the stability of the platform system accuracy. In this paper, we studied the working principle of fiber optic gyro, completed the calibration test of the fiber optic gyro which aimed at the requirement of the design; We established a fiber optic gyro temperature model according to the temperature characteristic of fiber optic gyroscope. Based on this design,we completed the fiber optic gyro temperature experiments,and simulated the temperature compensation of gyro output. After the compensation, temperature offset characteristics of fiber optic gyroscope obtained obvious inhibition, so we achieved pretty good results; The feedback noise of sensor of fiber-optic gyroscope (fog) is another important factor affected the accuracy of the system. We put forward the wavelet threshold filtering, and did the simulation analysis of filtering algorithm, according to the characteristics of the signal and the design requirements of stable platform.Finally, we established the transfer function of the control system according to the mathematical model in every controlling unit. In view of the steady speed ring,the traditional PID controller was designed. For the problems of traditional correction methods, we used the synovial variable structure control algorithm design to design and simulate the position tracking loop controller. The track circuit simulation results showed that using exponential reaching law of synovial variable structure control design of the controller was better than traditional design method in correction of regulating effect aspect. It has pretty good robustness to friction interference. On this basis,we debugged the hardware and software of the stable platform system. We wrote the serial debugging assistants and PC software according to the requirements of the debugging using Qt and Labview software. We put forward the deficiencies of the design and suggestions for improvement on the system meanwhile the analysis of the experimental results.