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针对临近空间“空-空”激光通信链路的传输特性,进行了较为系统的研究。首先,对比临近空间的“空-地”链路和“空-天”链路,给出了“空-空”链路的大气信道特征:一方面,从大气成分等因素出发,指出了可能造成“空-空”链路大气衰减的3种原因,得到了“空-空”链路的大气衰减信道;另一方面,由相关资料得到“空-空”链路所在空域的大气湍流尺度,再根据大气湍流尺度与激光光束直径的对比关系引发的湍流效应的不同,分析了“空-空”链路的大气湍流信道。其次,重点针对大气湍流效应,进行了仿真计算,得到了光强闪烁方差与通信传输距离、光强闪烁方差与激光波长、到达角起伏方差与传输距离的关系。最后,对计算结果进行了讨论。
Aiming at the transmission characteristics of near space “air-air ” laser communication link, a systematic study has been carried out. First of all, the air channel characteristics of the “air-space ” link are given by comparing the “air-ground” link and the “air-sky” link of the adjacent space: on the one hand, According to the factors, it is pointed out that there are three possible causes of air attenuation in the air-to-air link, and the air attenuation channel of the air-to-air link is obtained. On the other hand, The air turbulence channel of the air-space link is analyzed according to the turbulence effect caused by the contrast between atmospheric turbulence scale and laser beam diameter. Secondly, focusing on the atmospheric turbulence effect, the simulation calculation is carried out. The relationship between the intensity flicker variance and the communication distance, the intensity flicker variance and the laser wavelength, the variance of the arrival angle and the transmission distance are obtained. Finally, the calculation results are discussed.