Li Shengmin, Zhang Yuanqing. Annular Facula Detection and Error Compensation of Four-Quadrant Photoelectric Detector in Space Laser Communication[J]. Chinese Journal of Lasers, 2017, 44(11): 1106005
- Chinese Journal of Lasers
- Vol. 44, Issue 11, 1106005 (2017)
Fig. 1. Working principle of QD
Fig. 2. Structural schematic of Cassegrain optical antenna system
Fig. 3. Models of facula with Gaussian distribution energy. (a) Complete circular facula; (b) annular facula
Fig. 4. Structural schematic of APT system. (a) Beam alignment detection system for fine tracking; (b) beam transverse drift; (c) angle error of beam and receiving antenna boresight
Fig. 5. (a) Schematic of annular facula detection; (b) distribution of calculated values of x at (0.14, 0)
Fig. 6. Annular facula energy distributions of QD. (a) Beam has been aligned; (b) 0
Fig. 7. Error analysis of annular facula and complete facula algorithms. (a) X-axis output results and position of actual facula; (b) detection sensitivity
Fig. 8. Variation in target facula offset x with facula center coordinate X' when Rd=1 mm
Fig. 9. Variation in target facula offset x with facula center coordinate X' when Rx=0.3 mm
Fig. 10. Schematic of compensation algorithm. (a) Compensation value; (b) compensation of angle error
Fig. 11. Diagram of experimental system
Fig. 12. Schematic of facula search process. (a) Path of helical scanning; (b) output data of scanning process
Fig. 13. Measured data of variation in target facula offset x with facula center coordinate X' when shading ratio is determined
Fig. 14. Detection value of position offset of annular facula
Fig. 15. Miss distance of facula in fine tracking
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Table 1. Compensation process calculation of annular facula error value
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Table 2. Offset compensation value e of annular facula
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