Ruijin Li, Liming Zhang, Weiwei Xu, Xiaolong Si, Jiawei Li, Yunyou Hu, Xianhua Wang, Jixiang Wang. High-Precision Calibration Modeling of Point-Light-Source Turntable Based on Solar Vector[J]. Acta Optica Sinica, 2019, 39(11): 1128001
- Acta Optica Sinica
- Vol. 39, Issue 11, 1128001 (2019)
Fig. 1. Composition of point light source turntable system. (a) Schematic of sun sensor; (b) coordinate system definition and structural diagram; (c) mirror reflectivity
Fig. 2. Fitting of calculated solar vector value and theoretical value with first group of data when μ 0, ν 0, and ω 0 are 0, and α 0 and β 0 are initial values. (a) S U 
Fig. 3. Fitting of calculated solar vector value and theoretical value with the second group of data when μ 0, ν 0, and ω 0 are 0, and α 0 and β 0 are initial values. (a) S U
Fig. 4. Comparison of test results of elevation angle of turntable. (a) Angle measured by pitch encoder; (b) angle of pitch encoder calculated by calibrated model; (c) comparison of calculation and measurement values
Fig. 5. Comparison of azimuth measurement results of turntable. (a) Angle measured by azimuth encoder; (b) angle of azimuth encoder calculated by calibrated model; (c) comparison of calculation and measurement values
Fig. 6. Centroid pixels collected by camera at different sun positions and at different times. (a) Image centroid coordinates when sun observer is aligned with sun; (b) centroid coordinates of sun obtained by camera after calibration; (c) difference of pre-calibration and post-calibration pixels
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Table 1. Partial test data of turntable when reflector optical axis points to sun
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Table 2. Partial test data used to the verification of turntable model
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