Mr. li xiao ming Profile

li xiao ming

at chang chun university of science and technology

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Proceedings Article | 21 August 2013 Paper

Math analysis of two-axis rotation-mirror course-tracking system for laser communication

Xiao-ming Li, Jian Sun, Lei Bi, Li-zhong Zhang, Li-xin Meng

Proceedings Volume 8906, 890626 (2013) https://doi.org/10.1117/12.2034879

KEYWORDS: Mirrors, Telecommunications, Laser communications, Sensors, Reflectors, Charge-coupled devices, Mathematics, Laser systems engineering, Error analysis, Mathematical modeling

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In the space laser communication terminal with rotation-mirror, course- tracking system achieves APT (Alignment Pointing and Tracking) function by a two-axis rotation-mirror and reduces the weight and power dissipation of the system. Image rotation will be exist, if the photoelectric-detect unit is fixed and not rotate with rotation-mirror. Rotation of mirror will make revolution between coordinates of mirror and detector, in which mirror’s adjust-angle is not linear to detection-angle. In the paper, firstly math model of rotation-mirror course-tracking system for laser communication terminal based on the vector theory of optical reflection is established and deduces the adjust formulation of mirror tracking the beacon laser, figuring out relation between adjust-angle and detection-angle. As a result, the formulation is very complex and is not desired for system. To optimize computed efficiency, the relationship between rotation-mirror angle and the detector’s elevation and azimuth is analyzed in detail. The calculating formulation to eliminate image-rotation's affection is simplified, while the angle error of this method has been got. Analytical result shows the maximum calculating error is 3.9μrad, being satisfied with the need of course-tracking accuracy. The paper presents the adjust-angle formulation for the two-axis rotation mirror course-tracking system used for laser communication terminal, is useful for the design of tracking system.

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