The quick acquisition technique for laser communication between LEO and GEO

Li-zhong Zhang; Rui-qin Zhang; Yong-hao Li; Li-xin Meng; Xiao-ming Li

doi:10.1117/12.2034669

21 August 2013 The quick acquisition technique for laser communication between LEO and GEO

Li-zhong Zhang, Rui-qin Zhang, Yong-hao Li, Li-xin Meng, Xiao-ming Li

Proceedings Volume 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems; 890621 (2013) https://doi.org/10.1117/12.2034669
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

The sight-axis alignment can be accomplished by the quick acquisition operation between two laser communication terminals, which is the premise of establishing a free-space optical communication link. Especially for the laser communication links of LEO (Low Earth Orbit)-Ground and LEO-GEO (Geostationary Earth Orbit), since the earth would break the transmission of laser and break the communication as well, so the effective time for each communication is very shot (several minutes~ dozens of minutes), as a result the communication terminals have to capture each other to rebuild the laser communication link. In the paper, on the basis of the analysis of the traditional methods, it presents a new idea that using the long beacon light instead of the circular beacon light; thereby the original of two-dimensional raster spiral scanning is replaced by one-dimensional scanning. This method will reduce the setup time and decrease the failure probability of acquisition for the LEO-GEO laser communication link. Firstly, the analysis of the external constraint conditions in the acquisition phase has been presented in this paper. Furthermore, the acquisition algorithm models have been established. The optimization analysis for the parameters of the acquisition unit has been carried out, and the ground validation experiments of the acquisition strategy have also been performed. The experiments and analysis show that compared with traditional capturing methods, the method presented in this article can make the capturing time be shortened by about 40%, and the failure probability of capturing be reduced by about 30%. So, the method is significant for the LEO-GEO laser communication link.

Citation Download Citation

Li-zhong Zhang, Rui-qin Zhang, Yong-hao Li, Li-xin Meng, and Xiao-ming Li "The quick acquisition technique for laser communication between LEO and GEO", Proc. SPIE 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems, 890621 (21 August 2013); https://doi.org/10.1117/12.2034669

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KEYWORDS

Laser communications

Raster graphics

Sensors

Receivers

Failure analysis

Signal attenuation

Transmitters

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