Spot Extraction Method of Coarse Tracking Under Sky Background in Space Laser Communication

Journal of Atmospheric and Environmental Optics ›› 2017, Vol. 12 ›› Issue (3): 236-240.

Spot Extraction Method of Coarse Tracking Under Sky Background in Space Laser Communication

XIE Xinxin1，2，3, JIANG Lun1，2, ZHANG Lei1，2, TONG Shoufeng1，2, LI Xiang1，2，3

(1 The Institute of Space Optoelectronic technology, Changchun University of Science and Technology, Changchun, 130022, China;
2 Defence Key Subject Laboratory of Aero and Ground Laser Communication Technology, Changchun University of Science and Technology, Changchun, 130022, China;
3 School of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun, Jilin, 130022, China)

Received:2015-10-30 Revised:2015-11-06 Online:2017-05-28 Published:2017-05-18

Abstract

Abstract:

With the high-speed development of science and technology, the demand for information is growing rapidly. Space laser communication is used more and more widely due to its advantages, such as faster rate of communication, smaller beam divergence angle of communication and better security and confidentiality,. In the space laser communication system, the sky background radiation is the main background noise. Spot extraction has become a major impact on tracking accuracy in strong sky background conditions. Several methods for suppressing sky background were described, such as using atomic filters, reducing the caliber receiver, et al. Under the experimental conditions, coarse tracking spot is processed by using Otsu thresholding and centroiding algorithm. The effects of sky background light on coarse tracking spot is analyzed. The experimental results show that under the influence of the sky background, the Otsu thresholding method can accurately extract imaging spot, it also can effectively improve the coarse tracking accuracy.

Key words: space laser communication, coarse tracking, Otsu thresholding, spot centroid algorithm

CLC Number:

TN929.1

XIE Xin-Xin, JIANG Lun, ZHANG Lei, TONG Shou-Feng, LI Xiang. Spot Extraction Method of Coarse Tracking Under Sky Background in Space Laser Communication[J]. Journal of Atmospheric and Environmental Optics, 2017, 12(3): 236-240.

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