Research On Imaging System Of Beaconless Acquisition And Tracking For Space Laser Communication System

With the development of satellite laser communication,the communication loads carried by low-orbit satellites are gradually developing in the direction of light weight and low power.The space laser communication beaconless acquisition technology abandons the beacon light and related components in the classical space laser communication,and uses the communication light with small beam divergence angle to scan and acquire,which greatly reduces the weight,volume and power consumption.In space laser communication,tracking technology is the core technology of establishing communication link,and effective spot detection technology is the key of tracking system,which can ensure the smooth link and enhance the stability of tracking system.This paper introduces the principle,work flow and system characteristics of tracking technology with beaconless,and analyzes the core links.Based on the research of the working principle of the beaconless acquisition system,the acquisition strategy suitable for the beaconless system is selected.This paper mainly studies the detection technology in the tracking system and analyzes the factors that affect the detection,acquisition and tracking of light beam in the imaging system.The problems affecting image quality such as blind element and non-uniformity are studied,and the appropriate detection and compensation methods are selected.The filtering algorithm and the algorithm based on the near infrared beam position detection are designed and the hardware of the imaging positioning system is designed and implemented.A laboratory experiment system was built,and the performance parameters of the camera were tested.Indoor tracking experiment was carried out to complete the tracking experiment.By filtering,correction and speckle center coordinates calculation processing,such as camera output of miss distance via a serial port sent to the servo control unit,complete the flare calculation of miss distance,and then control the galvanometer beam tracking,control the spot in the center of the field of view,by establishing stable laser link closed-loop servo system,the system tracking error is better than 6 ?rad.