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Observation angular distance error modeling and matching threshold optimization for terrestrial star tracker.

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    This summary is machine-generated.

    This study introduces a model for observation angular distance error in star trackers, crucial for accurate star identification and attitude measurement. The model helps optimize the angular distance matching threshold for improved star tracker performance.

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    Area of Science:

    • Aerospace Engineering
    • Astrophysics
    • Optical Engineering

    Background:

    • Observation angular distance error significantly impacts star tracker performance, affecting identification success, attitude accuracy, and real-time operation.
    • This error is a key criterion for star identification but lacks a clear definition and model.
    • Existing methods do not fully address the complexities of angular distance error in terrestrial star trackers.

    Purpose of the Study:

    • To develop a comprehensive model for observation angular distance error in terrestrial star trackers.
    • To establish an optimal angular distance matching threshold for efficient star identification.
    • To validate the proposed model through simulations and experimental data.

    Main Methods:

    • Analysis of astrometric transformations to determine the variation range of observation angular distance error.
    • Development of an observation angular error model.
    • Derivation of an optimal angular distance matching threshold expression based on the error model.

    Main Results:

    • The proposed model accurately predicts the variation range of observation angular distance error.
    • The derived optimal threshold expression enhances star identification efficiency.
    • Numerical simulations and a night sky experiment showed discrepancies below 0.5'' between the model, simulation, and experimental results.

    Conclusions:

    • The developed observation angular error model is reliable and validated by experimental data.
    • The optimal angular distance matching threshold improves the efficiency of star identification in terrestrial star trackers.
    • This work clarifies the role and impact of observation angular distance error, advancing star tracker technology.