Research On Visual Axis Stability Control Method Of Airborne Laser Space Communication Terminal

In recent years,the laser communication technology of airborne platform has developed rapidly.With the application of new materials and high-performance detectors,long-distance and high-precision become an urgent problem for airborne laser communication terminals.The visual axis stabilization platform of airborne space laser communication is mainly responsible for fast acquisition,tracking and targeting of targets,and establishing a stable communication link,which is an important part of airborne space laser communication.However,in the high altitude and high-speed environment,the airborne visual axis stabilized platform is affected by wind,carrier vibration,cloud and atmospheric boundary layer,noise and other disturbance factors.The visual axis can not maintain stable and accurate alignment,resulting in communication quality reduction or communication interruption,which greatly hinders the point-to-point communication mode of laser communication.Therefore,in order to ensure that the visual axis of airborne space laser communication can track the target stably and successfully complete the high-quality information transmission,it is necessary to use the relevant control methods to suppress the disturbance of the stable platform.This paper first analyzes the structure of the visual axis stabilized platform,clarifies the coupling relationship between the moment of inertia of the platform frame,introduces the working mode of the visual axis stabilized platform for airborne space laser communication,and expounds the components and working process of the visual axis stabilized platform.On this basis,the main factors affecting the Los platform are analyzed in detail,which is the next model Analysis and control methods lay the foundation.Secondly,the coordinate system relationship of airborne platform is briefly described,and the conversion process from WGS-84 coordinate system to visual axis coordinate system is analyzed in detail.In view of the complex disturbance of airborne visual axis stabilized platform in high altitude environment,the dynamic model of aircraft is analyzed.Then,in view of the situation that airborne visual axis stabilized platform is disturbed by a large number of nonlinear random,this paper chooses the ADRC method.Aiming at the problem that there are many ADRC parameters and it is difficult to adjust parameters,on the basis of particle swarm optimization algorithm,the way of particle swarm grouping and adding chaos factor is improved,and the ADRC parameters are adjusted by the Binary—State Chaos PSO algorithm.Finally,the simulation experiment system of airborne space laser communication is built by using the laboratory equipment,and the relevant simulation experiments are carried out for the effect of visual axis stability tracking.The experimental results show that the stability control technology meets the accuracy requirements of axis stability tracking and has good tracking performance.It can realize the stable establishment of airborne laser communication link and verify the applicability and stability of the control method in the process of visual axis tracking.