基于Hilbert-Huang变换对近海面光学湍流特性分析  

Analysis of Near Sea-Surface Optical Turbulence Characters Based on Hilbert-Huang Transform

作　　者：张汉九 孙刚 张坤 巫阳 王菲菲 李学彬 崔生成 刘庆 翁宁泉 Zhang Hanjiu;Sun Gang;Zhang Kun;Wu Yang;Wang Feifei;Li Xuebin;Cui Shengcheng;Liu Qing;Weng Ningquan(School of Environmental Science and Optoelectronic Technology,University of Science and Technology of China,Hefei 230026,Anhui,China;Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,Anhui,China)

机构地区：[1]中国科学技术大学环境科学与光电技术学院,安徽合肥230026 [2]中国科学院合肥物质科学研究院安徽光学精密机械研究所大气光学重点实验室,安徽合肥230031

出　　处：《激光与光电子学进展》2022年第12期30-37,共8页Laser & Optoelectronics Progress

基　　金：十三五装备预研项目(41416030204)。

摘　　要：利用温度脉动仪在近海面测量的大气折射率结构常数C_(n)^(2),结合集合经验模态分解(EEMD)获得不同时间尺度的本征模态函数(IMF)分量,对IMF的周期进行分析,结果表明IMF的平均周期存在较高吻合度的自然指数关系,根据大气湍流各态历经性可以得到其空间尺度特征。对得到的IMF分量进行Hilbert变换,得到IMF在各自中心频率的瞬时波动情况,同时得到常规气象参数与C_(n)^(2)的Hilbert-Huang变换边际谱。结果表明,对比传统的快速傅里叶变换(FFT),Hilbert-Huang变换更能体现出光学湍流的频谱分布特征。分析了不同层结的常规气象参数与C_(n)^(2)的相关性,进一步认识近海面光学湍流时空特征。研究结果为海洋环境下激光传输提供一定参考价值。We used a microtemperature sensor to measure the atmospheric refractive index structure constant C_(n)^(2) of near sea-surface and combined ensemble empirical mode decomposition (EEMD) to obtain the intrinsic mode function (IMF) component with different time scales.Furthermore,the analysis of the IMFs’periods indicates that their mean periods have a high correlation of natural exponential function.Thus,we can derive the space characters based on the ergodicity property of atmospheric turbulence.The result of the Hilbert transform for the IMF component shows the different scale fluctuations near the center frequency of each IMF.Additionally,we can obtain the Hilbert-Huang transform marginal spectrum of conventional meteorological elements and C_(n)^(2),and the results indicate that it is superior to the traditional fast-Fourier transform (FFT) in reflecting spectral distribution characteristics of optical turbulence.Further,we analyze the relationship between the C_(n)^(2) and conventional meteorological elements under different atmospheric stratification.From above,we can learn more about the spacetime characters of near sea-surface optical turbulence,and the study results will provide some references for laser propagation in the marine atmosphere.

关 键 词：大气光学湍流 集合经验模态分解 本征模态函数周期 HILBERT-HUANG变换 边际谱 

分 类 号：P431[天文地球—大气科学及气象学]