INNER AND OUTER SCALE EFFECTS ON SCINTILLATION INDEX FOR AN INFRARED LASER PROPAGATING ON EARTH-SPACE PATHS |
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Authors: | Ruike Yang Kexiang Liu Yue Hao Liangchao Li and Jian Wu |
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Institution: | (1) School of Science, Box 273, Xidian University, Xi’an, Shaanxi, 710071, China;(2) School of Microelectronics, Xidian University, Xi’an, Shaanxi, 710071, China;(3) China Research Institute of Radio Wave Propagation, Beijing, 102206, China |
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Abstract: | The effects of the inner-and outer-scale of turbulent atmosphere on the scintillation index for an infrared laser beam propagating
through atmospheric turbulence are discussed under the assumption that small-scale irradiance fluctuation is modulated by
large-scale irradiance fluctuation on Earth-space paths. A model about the scintillation index with the inner-and outer-scale
is developed. A numerical analysis is done by using this model. It is shown that the effect of the inner scale on scintillation
index is larger than the outer scale effect for the lesser wavelength wave at visible and infrared band. From moderate to
saturation regime, the inner scale effect becomes gradually small; however, the outer scale effect becomes gradually obvious.
Under moderate to strong regime, therefore, the effects of the inner-and outer-scale on scintillation index must be considered
for theoretical prediction scintillation of an infrared laser beam propagating through turbulent atmosphere on Earth-space
paths. |
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Keywords: | Turbulent atmosphere Inner scale Outer scale Infrared laser beam Earth-space paths Scintillation index |
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