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Rotation matrix error-decoupling methods for Risley prism closed-loop tracking
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DOI：10.1016/j.precisioneng.2022.03.004.png)
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In a rotational double-prism photoelectric tracking system based on image feedback, the rotation angle of the prisms must be adjusted to correct the tracking error. This study proposes a rotation matrix error-decoupling method that removes the strong coupling between the tracking errors in the x and y directions and the prism rotation in the rotational double-prism tracking device. Based on the tracking error after decoupling, the rotations of the same and reverse directions are simultaneously applied to both prisms to achieve closed-loop tracking. The high precision and robustness of the method were confirmed in simulation and experimental tracking evaluations.
Keyword:
Rotational double-prism
Rotation matrix error-decoupling
Closed-loop tracking
High precision
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