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Error coupling analysis of the laboratory calibration method for a star tracker.

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    Accurate star tracker calibration is crucial. This study introduces an equivalent principal point error concept to address parameter coupling, ensuring high accuracy even with imperfect decoupling during laboratory calibration.

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    Area of Science:

    • Aerospace Engineering
    • Optical Engineering
    • Astrophysics Instrumentation

    Background:

    • Star trackers require precise calibration for accurate attitude determination.
    • Common laboratory calibration methods suffer from internal and external parameter coupling, impacting performance.
    • The coupling between principal point and installation angle is a key challenge.

    Purpose of the Study:

    • To theoretically analyze the coupling mechanism in star tracker laboratory calibration.
    • To introduce the concept of equivalent principal point error.
    • To verify the effectiveness of the calibration method and coupling analysis through simulations and experiments.

    Main Methods:

    • Theoretical analysis of the star tracker laboratory calibration model.
    • Introduction and definition of the equivalent principal point error.
    • Conducting simulations and bench experiments for verification.

    Main Results:

    • The coupling mechanism between principal point and installation angle was analyzed.
    • The equivalent principal point error concept was introduced and validated.
    • Calibration accuracy remains high even with imperfect decoupling, especially with more samples.
    • Equivalent principal point error shows quick convergence and minimal impact on attitude.

    Conclusions:

    • The proposed calibration method and equivalent principal point error effectively manage parameter coupling.
    • High star tracker accuracy is achievable despite challenges in decoupling internal and external parameters.
    • Increased calibration samples improve decoupling accuracy and overall performance.