【摘要】 大气光学湍流严重影响光学系统的正常工作，大气折射率结构常数C_n²廓线的获取是计算大气湍流影响效应的基础，而目前C_n²廓线的实测与估算通常限于平流层底部以下，对于平流层中部以上的C_n²廓线则研究较少。为了研究更高高度的C_n²分布特征，利用戈壁地区气象火箭探测获取的常规气象参数，以30 km为界分两层估算了C_n²廓线，在30 km以上，探索性地尝试了基于Tatarskii公式的参数化方案。研究结果表明：在30 km以下，估算的C_n²数量级和变化趋势与历史数据较一致；在30 km以上，在假定满足均匀各向同性理论情况下，估算的C_n²随着高度增加整体呈减小趋势且变化平稳，平均数量级从10^-20减小到10^-23。由于目前关于湍流的理论基础还不够完善，因此本文对30 km以上C_n²的估算还仅仅是探索性的尝试，但为认识平流层以上C_n²特性提供另一种思路与参考。更多还原

【Abstract】 Atmospheric optical turbulence seriously affects the normol operation of optical systems. The acquisition of the profile of atmospheric refractive index structure constant C_n² is the basis for calculating the effect of atmospheric turbulence, however, the research of the refractive index structure constant C_n²profile is usually under 30 km presently. In order to study the C_n² profile on higher altitude, the C_n² profile in Gobi area is estimated in two parts taking 30 km as the boundary based on the conventional meteorology parameters obtained from meteorological rocket sounding, and regarding to the the C_n² profile above 30km, Tatarskii optical turbulence parameterization scheme and outer scale model HMNSP99 are used tentatively. The results show that under 30 km, the magnitude order and changing trend of estimated C_n² are consistent with those of historical data, and at the altitude above 30 km, assuming that the homogenous and isotropic turbulence is satisfied, the estimated C_n² decreases steadliy with the increase of altitude, with the average magnitude order decreasing from 10^-20 to 10^-23. Because of the lack of basic theory about turbulence, the estimation of C_n² above 30 km in this work is tentative, however, it provides another idea and reference for further understanding the characteristics of the C_n² profile above the stratosphere.更多还原