Scintillation Index of a Plane Wave Propagating Through Kolmogorov and Non-Kolmogorov Turbulence along Laser-Satellite C
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Journal of Russian Laser Research, Volume 41, Number 6, November, 2020
SCINTILLATION INDEX OF A PLANE WAVE PROPAGATING THROUGH KOLMOGOROV AND NON-KOLMOGOROV TURBULENCE ALONG LASER-SATELLITE COMMUNICATION DOWNLINK AT LARGE ZENITH ANGLES Wenhe Du,∗ Xiujuan Cheng, Yanchun Wang, Zhan Jin, Daosen Liu, Shuang Feng, and Zhanyu Yang College of Telecommunication and Electronic Engineering Qiqihar University Qiqihar 161006, Heilongjiang, China ∗ Corresponding author e-mail: atocom @ 163.com
Abstract Now it is indisputable fact that the Earth’s aerosphere contains Kolmogorov and non-Kolmogorov turbulence, which has been confirmed by increasing experimental evidences and theoretical investigations. Based on this, the scientific community conducts investigations on the combined influence of Kolmogorov turbulence and non-Kolmogorov one on optical wave propagating in the aerosphere. In this paper, based on the further additional measurements, a three-layer altitude-dependent turbulent spectrum model of refractive-index fluctuations for vertical/slant path is proposed to describe the variations of turbulent statistical characteristics with altitude in the aerosphere. This model that is more accurate than the two-layer model is used to estimate the performance of laser-satellite communication system for satellite-to-ground link. Using the extended Rytov theory, the scintillation index of a plant wave propagating through Kolmogorov and non-Kolmogorov turbulence along laser-satellite communication downlink at large zenith angles is presented. It is noteworthy that this expression is also valid in all regimes of turbulent fluctuations.
Keywords: laser satellite communication, atmospheric optics, non-Kolmogorov turbulence, Kolmogorov turbulence, scintillation index.
1.
Introduction
Through decades’ efforts of experts and scholars, laser-satellite communications technology has gained a great development that some experiments have been operated in space [1–9], which has potential advantages of higher data rates, smaller antennas, lower mass, lower volume, low probability of intercept, no restriction for frequency use, and less power consumption comparing to conventional radio frequency communication technology [10, 11]. Nowadays, these works are preparing to promote this technology to real application. It may be expected that a new generation of satellite communication network will appear in the near future. However, the atmospheric turbulence deteriorates the performance of laser-satellite communication system for satellite-ground scenarios since the aerosphere is one part of its communication channel [10]. Manuscript submitted by the authors in English on August 29, 2020. c 2020 Springer Science+Business Media, LLC 1071-2836/20/4106-0616 616
Volume 41, Number 6, November, 2020
Journal of Russian Laser Research
So to design a reliable laser-satellite communication system, it is necessary first to understand these atmospheric turbulence effects on the laser beam [11]. So far, most researches have focused on the Kolmogorov turbulence [
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