研究目的
To reconstruct the wavefront of reception diversity atmospheric laser communication more quickly and accurately by improving the traditional modal method based on mutual information and proposing a fast wavefront reconstructing method based on Fractional Brownian motion.
研究成果
The proposed fast wavefront reconstructing method of reception diversity atmospheric laser communication based on Fractional Brownian motion can improve the reconstructing speed and accuracy, and reduce the equipment of system, which means lowering the cost of reception diversity atmospheric laser communication.
研究不足
The method's performance is dependent on the number of modes used for reconstruction and the sampling size, which can affect the reconstructing speed and accuracy.
1：Experimental Design and Method Selection:
The paper improves the traditional wavefront reconstructing modal method based on mutual information and proposes a fast wavefront reconstructing method based on Fractional Brownian motion for reception diversity atmospheric laser communication.
2：Sample Selection and Data Sources:
The wavefront distortion caused by atmospheric turbulence is simulated using Zernike polynomials with 65-order.
3：List of Experimental Equipment and Materials:
Shack Hartmann wavefront sensor (S–H WFS) with 48 effective subapertures is used.
4：Experimental Procedures and Operational Workflow:
The wavefront is reconstructed by calculating the mutual information between different Zernike modes and the wavefront distortion, then rearranging the Zernike modes from large MI to small MI. The wavefront of other laser beams is reconstructed based on Fractional Brownian motion.
5：Data Analysis Methods:
The root mean square error is used to describe residual wavefront, and the phase structure function is calculated to prove the feasibility of the proposed method.
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