Research On The Compensation Methods For Atmospheric Scintillation Effects On The Laser Communication Satellite Terminal Angle Detection Accuracy

With the continuous development of the technology of satellite lasercommunications, the effect of atmospheric turbulence on the influence of theground-to-satellite laser communication link has gradually become research hotspot forthe research units and institutions. Effects of atmospheric scintillation serious impact onthe accuracy of satellite terminal angle detection will not only affect the trackingstability of the communication link, but also will affect the link of the wholecommunication performance and even interrupt it. Therefore, it is necessary to analyzethe impacts of atmospheric scintillation effects on the on-board terminal angle detectionaccuracy, and come up with a set of suitable compensation methods for satellite lasercommunication terminal.This paper starts from an introduction to the basic theory, followed by an analysisof the impacts of atmospheric scintillation effect on the angle detection accuracy of thesatellite on-board terminal, then carries on the simulation analysis and proposes a set ofself-adaptive compensation methods for satellite on-board terminal, and throughexperiments it verifies the effectiveness of the compensation method. In theory, first ofall, it analyzes the domestic and foreign research progress of satellite lasercommunication technology and atmospheric scintillation compensation technology.Then, it introduces the basic theory of atmospheric optics, the causes of opticalaberrations and the satellite laser communication terminal angle detection principle, anddescribes in detail the basic theory of research work in this paper. Then, based on thetheory of atmospheric scintillation, it establishes the model of satellite on-boardterminal receives light intensity scintillation, and verifies with numerical simulation ofthe model. Through the simulation of the satellite on-board terminal optical system, thecases of spot imaging aberrations are observed, and the atmospheric scintillation effecton the calculation of spot centroid is calculated. According to the theoretical analysisabove, an adaptive exposure compensation method which is suitable for the satelliteon-board terminal is proposed, and the feasibility of compensation method to beperformed on the satellite on-board terminal is analyzed. As fot the experimentation,firstly, key components characteristic curve of experiment and the key parameters ofexperiment is measured and calibrated. Then, the Standard Centroid, ScintillationCentroid with and without the compensation method is measured, the statistical analysisto the measurement results is carried out. Data analysis results show that the adaptiveexposure control compensation method can effectively reduce the centroid positionerror caused by atmospheric scintillation imaging, thus improve the precision of angle detection.Based on the results of theoretical analysis, a kind of compensation method whichis suitable for satellite platform is put forward in this paper. The experimental resultsconfirm that the compensation method can effectively compensate the error of terminalangle detection due to atmospheric scintillation. This research means a lot to theestablishment and maintenance of the ground-to-satellite laser communication link,and is supposed to improve the stability and overall performance of the lasercommunication link to a certain extent.