热风对流式大气湍流模拟装置作为一种主要的大气湍流模拟手段有着广泛的应用,其所模拟的大气湍流与真实大气湍流相比在频谱特性与概率密度特性上的一致性一直鲜有人研究.采用同样的发射与测试设备分别在1、6 km真实大气链路与室内模拟装置内进行了长期的测量,并对其频谱特性和概率密度分布特性做了详细的分析.实验结果表明,对流式大气湍流模拟装置所模拟大气对于光强闪烁效应的模拟在频谱特性和概率密度分布特性上均与真实的大气相符.对于到达角起伏效应的模拟,在y 轴方向上,频谱特性与概率密度特性均与真实大气相符；但在x 轴方向上,由于模拟装置缺少横向侧风产生装置,频谱特性与概率密度特性均与真实大气有区别,概率密度分布无明显规律.

As one of most important simulation methods,hot air convection atmospheric turbulence simulator has been widely used in many area.However,there is rarely study on the spectral characteristics and probability density characteristics of the simulated turbulence.A long-term measurement is made in a real link under 1 km and 6 km atmospheric environment,and a simulate link by using the same laser emission device and measuring device.The detailed analysis of the spectral characteristics and the probability density fluctuations characteristics of the simulator are done.The experimental results show that compared with the real atmosphere,the spectral characteristics and the probability density fluctuations characteristics of scintillation generated by the convection atmospheric turbulence simulator are well agreed to the real atmosphere.For angle-of-arrival,the spectral characteristics and the probability density fluctuations characteristics are well agreed to the real atmosphere on y axis.But on x axis,because of the lack of crosswind,the spectral characteristics is different from real atmosphere.For probability density fluctuations characteristics,there is no obvious pattern.