Investigation of the wind speed effect on the communication quality of space downlink optical communication system

Space optical communication can transmit at a high speed with great communication quality. With the developing configuration of the satellite and the optical ground station, people start to pay more attention to the atmosphere channel. It is obvious that wind is an important factor of the atmospheric turbulence. Besides, an avalanche photodiode (APD) is necessary for a space downlink optical communication system to transmit the signal at a high data rate. And transmission power, zenith angle, receiving diameter, divergence angle, transmission diameter are basic parameters of a space downlink optical communication system. Thus, in this paper, we will introduce the ratio between each one of these parameters of a space downlink optical communication system and the gain factor of an APD at different wind speeds. Furthermore, the relationship between bit error rate (BER) and these ratios are analyzed in this paper. As a result, the stimulation indicates that the system with a higher transmission power, a larger zenith angle, a larger receiving diameter, a smaller divergence angle and a smaller transmission diameter is more sensitive to high wind speed. These results are beneficial to improve the space optical communication technique to adapt to the conditions at different wind speeds.