Journal
ATMOSPHERE
Volume 13, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/atmos13020162
Keywords
satellite laser communication; atmospheric optics; non-Kolmogorov turbulence; Kolmogorov turbulence; beam wander
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This study proposes models for refractive-index fluctuations in the free troposphere and stratosphere non-Kolmogorov turbulence, and derives the corresponding displacement variances based on the Markov approximation. The combined impacts of three-layer atmospheric turbulence on laser beam wander in satellite-ground laser communication are investigated, providing a theoretical model for understanding this phenomenon.
It is accepted that there exists two kinds of atmospheric turbulence in the Earth's aerosphere-Kolmogorov and non-Kolmogorov turbulence; therefore, it is important to research their combined impacts on laser-satellite communications. In this paper, the exponential power spectra of refractive-index fluctuations for non-Kolmogorov turbulence in the free troposphere and stratosphere are proposed, respectively. Based on these two spectra, using the Markov approximation, beam wander displacement variances of a Gaussian-beam wave are derived, respectively, which are valid under weak turbulent fluctuations condition. On this basis, using a three-layer altitude-dependent turbulent spectrum model for vertical/slant path, the combined influence of a three-layer atmospheric turbulence on wander of a Gaussian-beam wave as the carrier wave in laser-satellite communication is studied. This three-layer spectrum is more accurate than a two-layer model. Moreover, the variations of beam wander displacement with beam radius, zenith angles, and nominal value of the refractive-index structure parameter on the ground are estimated. The theory of optical wave propagation through non-Kolmogorov atmospheric turbulence is further enriched and a theoretical model of a three-layer atmospheric turbulence beam wander for a satellite-ground laser communication uplink is established.
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