High-precision positioning system of four-quadrant detector based on the database query

Xin Zhang; Xiao-guo Deng; Xiu-qin Su; Xiao-qiang Zheng

doi:10.1117/12.2075695

19 February 2015 High-precision positioning system of four-quadrant detector based on the database query

Xin Zhang, Xiao-guo Deng, Xiu-qin Su, Xiao-qiang Zheng

Proceedings Volume 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014); 94492R (2015) https://doi.org/10.1117/12.2075695
Event: The International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference (icPOE 2014), 2014, Xi'an, China

Abstract

The fine pointing mechanism of the Acquisition, Pointing and Tracking (APT) system in free space laser communication usually use four-quadrant detector (QD) to point and track the laser beam accurately. The positioning precision of QD is one of the key factors of the pointing accuracy to APT system. A positioning system is designed based on FPGA and DSP in this paper, which can realize the sampling of AD, the positioning algorithm and the control of the fast swing mirror. We analyze the positioning error of facular center calculated by universal algorithm when the facular energy obeys Gauss distribution from the working principle of QD. A database is built by calculation and simulation with MatLab software, in which the facular center calculated by universal algorithm is corresponded with the facular center of Gaussian beam, and the database is stored in two pieces of E²PROM as the external memory of DSP. The facular center of Gaussian beam is inquiry in the database on the basis of the facular center calculated by universal algorithm in DSP. The experiment results show that the positioning accuracy of the high-precision positioning system is much better than the positioning accuracy calculated by universal algorithm.

Citation Download Citation

Xin Zhang, Xiao-guo Deng, Xiu-qin Su, and Xiao-qiang Zheng "High-precision positioning system of four-quadrant detector based on the database query", Proc. SPIE 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014), 94492R (19 February 2015); https://doi.org/10.1117/12.2075695

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