As The Axis Of The Optical Tracking System Stability Control

The opto-electronic tracking system in this paper mainly contraposes optical space communications tracking control system.Optical space communications will be an important element in the future space communication infrastructure. An optical space communication system must be capable of high accuracy line-of-sight (LOS) under disturbance in satellite environment for reliable communications, as a consequence, the acquisition, tracking and pointing (ATP) are critical and difficult issues in optical space communications. The high accuracy LOS stabilization system is the kernel of implementing ATP functions. So, it is necessary for researching LOS stabilization system in optical space communications.Based on the brief introduction of the concepts, key techniques, development trend, and subsystem of optical space communications and ATP techniques. Then, the paper research the system noise and restraining the noise, emphasize on the composite axis control.For improving the LOS stabilization system accuracy, the two scheme were researched in the paper. They are the composite axis control applied Fuzzy-PID control and the three composite axis system based on Moire fringes. In the first string, firstly the Fuzzy-PID controller with self-adjusting parameter was designed, afterward was linked with subsystem of the composite axis and transfer function of the various control loops, finally the system was simulated under Matlab. Farther, put forward a kind of advanced control strategy and tracking algorithm, namely fuzzy-PID control based on wavelet analyses. Through simulation, the dynamic response quality and stability were analyzed. Then comparing the obtained result with the result of conventional PID controller, the result shows that the system with Fuzzy-PID controller is better than the conventional PID controller, the dynamic performance and stabilization accuracy of LOS can be improved.In the second string, the paper has studied the capability that Moire fringes can detect tiny displacement. Compare with the designed method of composite axis, the three composite axis control system was framed. Theoretically, the LOS stabilization accuracy was improved ten multiples.