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    Area of Science:

    • Optical communications
    • Atmospheric optics
    • Wavefront sensing

    Background:

    • Uplink pre-compensation in ground-to-satellite optical links is challenging due to unavailable uplink path measurements.
    • Accurate wavefront error measurement is crucial for effective pre-compensation.

    Purpose of the Study:

    • To develop and evaluate a method for estimating uplink wavefront error using accessible downlink measurements.
    • To improve the performance of uplink pre-compensation in free-space optical communication systems.

    Main Methods:

    • Tomographic reconstruction of the common atmospheric volume using successive downlink beam measurements.
    • Utilizing existing downlink wavefront sensors for data acquisition.
    • Simulating performance under various atmospheric conditions.

    Main Results:

    • The proposed method successfully reconstructs uplink wavefront errors.
    • Achieved significant reduction in residual mean-square wavefront error compared to direct downlink phase pre-compensation (up to 8.6 times less).
    • Demonstrated good performance, particularly when the satellite point-ahead angle exceeds the isoplanatic angle.

    Conclusions:

    • The developed tomographic method provides a viable solution for uplink pre-compensation in optical satellite links.
    • The method's hardware simplicity and effectiveness make it a promising approach for future optical communication systems.
    • This technique enhances the reliability and performance of ground-to-satellite optical communication.