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Star centroiding error compensation for intensified star sensors
Optics Express
|January 7, 2017
Summary
This study introduces a novel compensation method to improve star centroiding accuracy in intensified star sensors. The technique effectively eliminates image intensifier errors, significantly enhancing attitude measurement precision for dynamic applications.
Area of Science:
- Aerospace Engineering
- Optical Engineering
- Astrophysics
Background:
- Traditional star sensors offer high-precision attitude data but suffer from poor dynamic performance due to low sensitivity.
- Intensified star sensors utilize image intensifiers to boost sensitivity and dynamic performance.
- However, image intensifiers degrade star centroiding accuracy, impacting overall attitude measurement precision.
Purpose of the Study:
- To propose and validate a star centroiding error compensation method for intensified star sensors.
- To mitigate the accuracy decrease caused by image intensifiers in star sensors.
- To enhance the attitude measurement precision of intensified star sensors.
Main Methods:
- An imaging model for intensified detectors was established, incorporating optical fiber panel deformation parameters and orthographic projection.
- The Levenberg-Marquardt (LM) optimization method was employed to determine position errors at target points.
- A nearest trigonometric interpolation method was developed to compensate for arbitrary centroiding errors on the image plane.
Main Results:
- The proposed compensation method effectively eliminated errors introduced by the image intensifier.
- Laboratory calibration and night sky experiments confirmed the method's efficacy.
- A significant improvement in the precision of intensified star sensors was achieved.
Conclusions:
- The developed star centroiding error compensation method successfully addresses the limitations of intensified star sensors.
- This technique enhances attitude measurement accuracy, making intensified star sensors more reliable for dynamic scenarios.
- The findings contribute to the advancement of high-precision attitude determination systems in aerospace applications.
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