中文摘要：

利用激光大气通信系统在长春市区进行了近地面激光大气传输实验,对接收不同孔径的光强起伏进行了昼夜观测,每次以0.01Hz采样频率连续采集10min数据作为样本,将计算出的光强起伏方差和到达角起伏方差归一化,进而计算出长春地区的实际大气折射率结构常数,并对不同孔径接收的光斑面积进行了分析和计算,实验结果表明：9月份的C2n值要比12月份高两个数量级;而从光斑面积随着统计数据分布的规律可以看出,相比200mm的接收孔径,接收孔径为55mm时统计方差大大降低,说明大孔径接收时光斑面积要大,可有效抑制光斑面积随时间的起伏效应,所得的结果对大气信道激光通信研究具有一定的借鉴作用。

英文摘要：

The atmosphere laser communication system was used to compelete experimental measurement of optical turbulence information in the horizontal propagation path near the ground in Changchun city.In this experiment,the measurement over a 10 min period with a sampling frequency of 0.01 Hz was carried out,and the real C of Changchun city was analyzed according to the normalized variance of scintillation fluctuation and arrival-of-angle fluctuation.Different apertures and spot area were analyzed and calculated.The experimental results show that the value of C in September is higher than that in December,and it can be seen from the statistical data distribution of the spot area that the statistical variance of the receiving aperture of 55 mm is greatly reduced compared with that of 200 mm,indicating a larger aperture of big spot area can effectively control the fluctuations effect over time.This paper is useful for the research of atmospheric turbulence effect in satellite-ground laser communication.