Experimental research of time-averaging effect in space optical communication

To present preference to design of pointing,acquisition and tracking link in space optical communication,time-averaging effect of the atmospheric scintillation in the strong turbulent regime was studied experimentally.The mathematical model for the fade probability in space optical communications was provided in which effect of the pointing jitter and atmospheric scintillation on intensity fluctuations was taken into account.Based on the above,the improvement of links' fade fluctuation by time-averaging effects was analyzed.Experimental results show that the probability density function of irradiance in the strong turbulent regime is governed by the lognormal distribution,when exposure time reaches several decades of milliseconds;the required fade budget of the link at a lost-tracking probability of 10-3 is improved by the least of 15dB~20dB,when the method of time-averaging effects of the atmospheric scintillation is used in space optical communications.