Scintillation model of laser beam propagation in satellite-to-ground bidirectional atmospheric channels |
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| Institution: | 1. National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China;2. Laboratory for Space Environment and Physical Sciences, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China;1. VSB–Technical University of Ostrava, Faculty of Electrical Engineering and Computer Science, Department of Telecommunications, 17. listopadu 15/2172, Ostrava-Poruba, Czech Republic;2. VSB–Technical University of Ostrava, Faculty of Electrical Engineering and Computer Science, Department of Cybernetics and Biomedical Engineering, 17. listopadu 15/2172, Ostrava-Poruba, Czech Republic;1. College of Communication Engineering, Jilin University, 5372 Nanhu Road, Changchun 130012, China;2. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Nanhu Road, Changchun 130033, China;3. Graduate School of Chinese Academy of Sciences, Beijing 100039, China;1. Department of Electronics and Electrical Communication, Faculty of Engineering, Tanta University, Egypt;2. National Institute of Laser Enhanced Sciences, Cairo University, Giza, Egypt;3. Wireless Intelligent Networks Center (WINC), Nile University, Giza, Egypt |
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| Abstract: | This paper discusses a scintillation model of laser beam propagation in satellite-to-ground bidirectional atmospheric channels. The frequency characteristics of the downlink were theoretically derived on the basis of measurements in low Earth orbit satellite-to-ground laser communication experiments. The speckle patterns were averaged and the frequency response of the received optical signal was filtered by a telescope aperture. The model parameters were obtained by fitting the results to the model. This paper introduces scaling factors for the uplink and extends the theory for the downlink to that for the uplink. The proposed model can generate time-varying optical signals based on the von Kármán spectrum for space-to-ground laser links. The scintillation index was estimated using the modified Hufnagel–Valley model, which was obtained from real measurements. The probability density function was fitted by the estimated scintillation index and compared to the gamma–gamma distribution under strong turbulence conditions. The scaling factor for the root mean square wind speed was newly introduced to fit the frequency spectra for the uplink. The simulation results are presented in this paper. The proposed scintillation model can contribute to improving the fading simulation of satellite-to-ground communication links as well as add to the future discussion of standards, like those proposed by the Consultative Committee for Space Data Systems. |
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