大气湍流对光学系统图像分辨力的影响  

Influence of atmospheric turbulence on image resolution of optical sensing system

作　　者：张晓芳[1] 俞信[1] 阎吉祥[1] 

机构地区：[1]北京理工大学信息科学技术学院光电工程系,北京100081

出　　处：《光学技术》2005年第2期263-265,共3页Optical Technique

摘　　要：讨论了大气湍流对空 地和地 空光学系统图像分辨力的影响。大气相关长度r0是评定大气湍流是否影响光学系统图像分辨力的主要依据。采用不同的大气湍流模型,通过计算相关长度得到了大气湍流对系统图像分辨力的影响,并对空 地与地 空系统的大气相关长度进行了计算比较。结果表明:对空 地观测系统来说,大气相关长度是大气层高度和反映大气湍流特征的C2n的函数。而对地 空观测系统来说,大气相关长度与高度几乎无关。分析了大气湍流对机载和星载光学遥感系统成像分辨力的影响。The atmospheric influences on image resolution of ground-to-space or space-to-ground system are analyzed. Atmospheric correlation length r0 is the basis of evaluating the atmospheric influence on image resolution. According to different atmospheric turbulence model, r0 has been calculated to evaluate the influence on image resolution. And r0 comparison between ground-to-space system and space-to-ground system is presented. For space-to-ground system, r0 is related with the altitude of atmospheric turbulence and Cn 2, and for ground-to-space system, r0 is independent of the altitude. The influences on image resolution of space-borne system and air-borne system caused by atmospheric turbulence are discussed through calculating r0.

关 键 词：大气湍流 大气相关长度 成像分辨力 机载 星载 

分 类 号：P421[天文地球—大气科学及气象学] P407.4