Research On Wavefront Simulation And Adaptive Calibration Algorithm Based On Atmospheric Turbulence Model

In order to overcome the adverse interference of atmospheric turbulence to the light wavefront and upgrade the availability of free space optical communications,we focus on the characteristics of turbulent wavefront and wavefront emulator-correction methods.In this paper,an optical simulation system under atmospheric turbulence is designed,and the algorithm research work is carried out around the requirements of the system.Firstly,a spatial wavefront phase screen in a circular aperture is constructed using Zernike polynomials.The density of points with phase information is adjustable.Subsequently,the phase structure was analyzed.According to the spatial and temporal correlation of Kolmogorov turbulence,the smooth change of the wavefront phase screen with variable time sparsity was skillfully restored by using parallel temporal filters.A hybrid spatial-temporal laser wavefront simulator with flexibly adjustable indexing is designed to simulate the spatial-temporal change process of distortion phase and to evaluate the performance of adaptive optical algorithms.Then based on the functional principle of the simulation system,a suitable regional relationship model was constructed to establish the correlation between phase and reference point offset through the law of micro lens array imaging,so as to obtain wavefront phase recovery and adaptive distortion calibration methods on the emulator system.Our research results can be applied to optical communication systems in later work,helping the optical communication system to enhance stability and reliability when coping with different environments,and improve its communication performance.