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oe1(光电查) - 科学论文

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  • Fiber Optic and Atmospheric Optical Communication || Atmospheric Communication Channels

    摘要： The atmosphere is a gaseous envelope that surrounds the Earth from the ground surface up to several hundred kilometers. The atmosphere consists of different kinds of gaseous, liquid, and crystal structures, including effects of gas molecules (atoms), aerosol, cloud, fog, rain, hail, dew, rime, glaze, and snow. Except for the first two, the others are usually called hydrometeors in the literature. Furthermore, due to irregular and sporadic air streams and motions, that is, irregular wind motions, chaotic structures defined as atmospheric turbulence are also present in the atmosphere.

    关键词： Hydrometeors,Atmosphere,Aerosol,Turbulence,Optical Communication

    更新于2025-09-12 10:27:22

  • [Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Statistics of Rain Attenuation in Prague, Empirical Data and Numerical Predictions

    摘要： Attenuation of electromagnetic waves in microwave bands is determined experimentally via measurement of received signal variations on terrestrial radio links operating in three frequency bands around 58, 94 and 122 GHz. The measured time series of attenuation are processed to obtain long-term cumulative distributions of attenuation due to hydrometeors. The obtained empirical distributions are compared with the ones predicted using the model of the Recommendation ITU-R P.530. For a given time percentages, the predicted attenuation levels exceeded are apparently lower than the levels of empirical distributions. A power-law relationship between attenuation and rain intensity is obtained by a least square approximation of measured simultaneous rain intensity and rain attenuation. The results are discussed and compared with the numerical predictions.

    关键词： electromagnetic wave propagation,atmospheric hydrometeors,rain attenuation

    更新于2025-09-04 15:30:14