Abstract
Abstract The positioning accuracy of the robotic fiber positioners (RFPs) is a crucial issue because incorrect fiber placement can significantly affect the spectral quality. The fiber viewing camera (FVC) is implemented to guide the fiber positioning. However, the current camera calibration methods are inconvenient for the narrow space of the telescope. To solve this problem, an innovative calibration method is proposed in this study. Multiple small planar targets are placed on the focal plane to form a spliced large target (SLT) to calibrate the lens aberrations. Then, the home position of the RFPs is used as a variable control point (VCP) to calibrate the extrinsic parameters. Furthermore, a weighted multiple harmonic (WMH) method is proposed to obtain accurate centroids of the deformed light spot. A fiber position detection system is constructed in the laboratory. Physical experiments verify the effectiveness and flexibility of the proposed method, which has practical engineering significance. 
Published Version
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