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Fading statistics for intersatellite optical communication.

R R Hayes

    Applied Optics
    |February 12, 2008
    PubMed
    Summary
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    Intersatellite optical links are prone to signal fading due to pointing jitter. To maintain a fade rate below once per year, root-mean-square pointing jitter must be kept under 7% of the beam width for systems with a 3-dB margin.

    Area of Science:

    • Optical engineering
    • Satellite communication systems
    • Signal processing

    Background:

    • Intersatellite optical communication links utilize narrow beam widths, increasing susceptibility to signal fading.
    • Pointing jitter and stationary pointing offsets can significantly aggravate signal fading in these systems.

    Purpose of the Study:

    • To calculate and analyze fade rates in intersatellite optical communication links.
    • To determine the acceptable levels of pointing jitter and offset for reliable communication.

    Main Methods:

    • Developed an integral solution for fade rate calculation in general nonsymmetrical systems with pointing bias.
    • Derived closed-form solutions for symmetrical systems (identical platforms and optics).
    • Modeled pointing jitter using Gaussian statistics for spaceborne telescopes with Gaussian beam profiles.

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    Main Results:

    • Quantified the relationship between pointing jitter, pointing offset, and signal fade rates.
    • Showed that for a 3-dB margin system, root-mean-square (RMS) pointing jitter must be less than 7% of the full beam width to achieve a fade rate below once per year.

    Conclusions:

    • Strict control of pointing jitter is crucial for maintaining signal integrity in intersatellite optical communication.
    • The derived solutions provide essential guidelines for designing robust optical communication systems in space.