大气湍流等效相位屏的仿真研究

Simulation of the Equivalent Phase Screen Distorted by Atmospheric Turbulence

为了研究光波在大气湍流中的传输特性,了解大气湍流中大气扰动的空间相位分布,分别利用谱反演法和泽尼克多项式法对大气湍流等效相位屏进行了数值仿真.仿真结果表明:谱反演模拟的相位屏体现的湍流高频信息较充分,但低频信息不足;泽尼克法模拟的相位屏体现的湍流低频信息较充分,但高频信息不足.随着采用的泽尼克多项式阶数的增加,其体现的高频信息得到改善,但这些高频信息主要集中在圆域的边缘区域.比较研究表明,谱反演法和泽尼克多项式法模拟大气湍流等效相位屏各有优缺点,可以在不同情况选择合适的方法或两者结合以达到预期结果.

In order to study the transmission characteristics of light waves in the atmospheric turbulence to understand the spatial phase distribution of atmospheric turbulence in atmospheric turbulence,the comparative study is made by two methods of generating the phase screen which have their advantages and disadvantages.Through the comparative analysis,it is found that the phase screen simulation of spectrum inversion is more adequate,but the low frequency information is insufficient,while the Zernike method simulation of the phase screen reflects the low frequency information of turbulence,but the high frequency information is insufficient. With the increase of the order of the Zernike polynomials,the high frequency information is improved,but the high frequency information is mainly concentrated in the edge region of the circular region. The comparative study shows that the spectral inversion method and the Zernike polynomial method,which have their advantages and disadvantages,can be selected or combined to achieve the desired results in different situations.