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    High-resolution satellite imaging requires accurate single-line-array mapping cameras. This study designs a coaxial four-mirror optical system and a desensitization method to minimize errors caused by satellite maneuvering, improving camera accuracy.

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    Area of Science:

    • Optical Engineering
    • Remote Sensing Technology
    • Satellite Imaging Systems

    Background:

    • Increasing satellite resolution necessitates advanced mapping cameras.
    • Satellite attitude maneuvering during imaging impacts camera accuracy.

    Purpose of the Study:

    • To design a coaxial four-mirror optical system for single-line-array mapping cameras.
    • To analyze the impact of secondary mirror misalignment on interior orientation elements.
    • To propose and validate a desensitization design method to enhance camera accuracy.

    Main Methods:

    • Optical system design: coaxial four-mirror system (f=7050 mm, F/10.8, FOV=1.2°, 450-800 nm).
    • Mathematical modeling and ray tracing to derive interior orientation element offsets.
    • Desensitization design using magnification parameter control.

    Main Results:

    • The designed optical system exhibits a maximum relative error not exceeding 2.119%.
    • The proposed desensitization method effectively reduces the sensitivity of interior orientation elements to secondary mirror misalignment.
    • The system desensitization design significantly improves camera accuracy.

    Conclusions:

    • The developed coaxial four-mirror optical system is suitable for high-accuracy satellite mapping.
    • The magnification parameter control method is effective in mitigating errors caused by optical system instability.
    • This research contributes to the advancement of precise satellite imaging technologies.