The Modeling of Tracking of Circumferential Scanning-type Satellite Laser Communication Terminals

Abstract

In the intersatellite laser communication system, the circumferential optical tracking structure has the advantages of small size and simple structure, which can be widely used. However, due to the coupling relationship between the azimuth axis and the pitching axis in the tracking of the target laser signal, and the disturbance caused by the electric machine, the satellite is used to get in and out of the earth. The vibration, which affects the tracking precision. In order to improve the tracking accuracy of the system, the matrix optical method is adopted to establish the propagation matrix of the light in the circumferential laser communication terminal, and the rough tracking algorithm based on the target light angle and the attitude information of the communication terminal is derived. Then the BP neural network is used to set the PID control on the basis of the precise motor model. Methods, the control model of communication terminal is established. Finally, the rough tracking control model is built in the Matlab-Simulink environment. The experiment validates the necessity of establishing the tracking algorithm model, and obtains better dynamic tracking error to meet the high precision rough tracking requirement of the inter satellite laser communication.