Effects of finite inner and outer scales on the scintillation index of turbulent slant path

In this paper, the effects of nonzero inner scales and finite outer scales are investigated, in the context of Gaussian beam propagation along a slant path under general turbulence conditions. Theoretical expressions for the cut-off spatial frequencies are derived with an approach method, and thereb...

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Bibliographic Details
Published in:Journal of modern optics 2017-02, Vol.64 (3), p.265-271
Main Authors: Wang, Minghao, Yuan, Xiuhua
Format: Article
Language:English
Subjects:
atmospheric slant path
atmospheric turbulence
beam propagation
Inner scale effects
Lasers
Mathematical analysis
Mathematical models
Optics
outer scale effects
Parameter modification
Propagation
Scale effect
Scintillation
Turbulence
Turbulent flow
Zenith
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Summary:In this paper, the effects of nonzero inner scales and finite outer scales are investigated, in the context of Gaussian beam propagation along a slant path under general turbulence conditions. Theoretical expressions for the cut-off spatial frequencies are derived with an approach method, and thereby a modified scintillation model is developed to incorporate inner scale and outer scale parameters in the analysis. Then, inner and outer scale effects on the downlink are analysed with respect to the zenith angle, the altitude of the transmitter, the initial beam radius, as well as the turbulence strength. Numerical results indicate that the effects of a finite outer scale mainly influence transmission that occurs at large zenith angles or high altitudes, while the inner scale effects are more prevalent. This study may be helpful to improve the accuracy of calculation of slant-path scintillation index, and thus benefit the characterization and optimization of space/air-ground laser communication systems.
ISSN:0950-0340
1362-3044
DOI:10.1080/09500340.2016.1229508