Method for separating internal and external parameters of star sensor based on characteristic trajectory imaging

Through the method based on feature trajectory imaging, the initial alignment deviation between the starlight simulator and the turntable is eliminated, the main points are separated, and the elliptical trajectory is optimized, which solves the problem of internal and external parameter coupling in ground calibration of the star sensor, and achieves high-precision separation of internal and external parameters.

CN119935188AActive Publication Date: 2025-05-06BEIHANG UNIV
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Patent Information

Application Number
CN202510008277.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-03
Publication Date
2025-05-06
Estimated Expiration
2045-01-03

AI Technical Summary

Technical Problem

The existing star-sensitive ground calibration method ignores the coupling effect between internal and external parameters when modeling internal and external parameters, resulting in a reduction in the accuracy of measurement results in some application scenarios.

Method used

By deeply analyzing the imaging model of the star sensor and its calibration system, an internal and external parameter separation method based on feature trajectory imaging was discovered and proposed. This method eliminates the initial alignment deviation between the starlight simulator and the turntable, separates the main points, and improves the accuracy of the main points by optimizing the design of the elliptical trajectory, and ultimately realizes the separation of internal and external parameters.

Benefits of technology

The effective separation of internal and external parameters of the star sensor is achieved, and the accuracy of the measurement results is improved, especially in some application scenarios where only the internal parameters of the star sensor are used, which significantly improves calibration efficiency and accuracy.

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Abstract

The invention discloses a method for separating internal and external parameters of a star sensor based on characteristic track imaging, which comprises the following steps of: analyzing an imaging model of the star sensor and a calibration system thereof, and finding and proposing an imaging track characteristic of the star sensor in the calibration system and an imaging rule of a characteristic track; eliminating an initial alignment deviation between the starlight simulator and the rotary table based on an imaging rule of a feature trajectory in the calibration system; separating main points based on an imaging rule of a characteristic track in a calibration system; performing optimization design and processing on the feature trajectory to further improve the precision of principal point separation; on the basis of eliminating the initial alignment deviation between the starlight simulator and the rotary table and separating the main point, comprehensively solving the residual parameters to realize the separation of the internal and external parameters of the star sensor. The invention further discloses a system, electronic equipment and a computer readable storage medium.
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Citation Information

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