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折迭式FFT算法对激光大气传输湍流效应的数值模拟
引用本文:王英俭,吴毅.折迭式FFT算法对激光大气传输湍流效应的数值模拟[J].强激光与粒子束,1992(4).
作者姓名:王英俭  吴毅
作者单位:中科院安徽光机所,中科院安徽光机所 合肥1125信箱 230031,合肥1125信箱 230031
摘    要:对传统的激光大气传输湍流效应的数值计算方法进行了改进。提出了一种快速折迭式FFT算法。该算法既可对湍流的高频谱抽样,亦可对湍流的低频谱进行修正。数值计算结果表明,这种算法提高了计算速度和精度,降低了对计算机内存容量的要求,并且更真实地模拟了大气湍流的强弱效应。

关 键 词:大气湍流  传输  FFT算法

FOLDING FFT MODIFICATION FOR LASER PROPAGATION IN THE TURBULENT ATMOSPHERE
Wang Yingjian and Wu Yi Anhui Institute of Opt. and Fine Mech,P.O.Box ,Hefei.FOLDING FFT MODIFICATION FOR LASER PROPAGATION IN THE TURBULENT ATMOSPHERE[J].High Power Laser and Particle Beams,1992(4).
Authors:Wang Yingjian and Wu Yi Anhui Institute of Opt and Fine Mech  POBox  Hefei
Institution:Wang Yingjian and Wu Yi Anhui Institute of Opt. and Fine Mech,P.O.Box 1125,Hefei 230031
Abstract:The traditional method of numerical simulations for laser beam propagation in the turbulent atmosphere is modified. A folding FFT treatment is put forward. High spatial frequency terms of the turbulent spectrum are sampled and low spatial frequency terms are revised using this treatment. Numerical simulation results show that the calculation speed and accuracy are both enhanced and the required computer memory is reduced. Also the numerical results reflect the real properties of strong and weak effects of the atmospheric turbulence.
Keywords:atmospheric turbulence  laser propagation  FFT method    
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