The performance of satellite-to-ground laser communication is affected by the atmospheric environment seriously, so it is a key issue for system design and operation to analyze the link availability quantitatively according to the channel characteristics. Firstly, the basic concept of laser communication link availability is put forward. Secondly, the preliminary theory model and calculation method of geostationary satellite-to-ground laser communication link availability are established by analyzing influencing factors. Lastly, the link availability of 77°E GEO satellite-to-ground laser communication is analyzed, combining with the atmospheric statistics data of typical optical ground stations in China. The results show that, it is feasible to achieve more than 90% joint link availability by implementing two stations, or to achieve more than 95% joint link availability by implementing three stations.
Based on the background of data relay satellite (GEO) to ground laser communication system, we analyze influence of
slant atmosphere channel on the coupling efficiency of space light to multimode fiber, and we present a solution with
adaptive optics technology to overcome the difficulty of low coupling efficiency when collecting with large aperture in
receiver terminal. The feasibility analysis of satellite to ground laser communication based on adaptive optics technology
is made. In order to verify the effectiveness of the proposed scheme, laboratory experiments of 2.5Gbps laser
communication based AO are carried out. The results shows: average received power increases 4.52dB, severe signal
fading is controlled effectively, average bit error rate (BER) reduces and the scheme of satellite to ground laser
communication with adaptive optics is correct.