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Proceedings Paper

Analysis of tropospheric scintillation due to clear-air and meteorological elements on slant microwave links
Author(s): Ruike Yang; ZhenSen Wu; Yingle Li
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Paper Abstract

Analysis of log-amplitude scintillation due to troposphere clear-air turbulent and meteorological parameters variation is shown at microwaves (MW) on slant paths, based on ITU-R turbulence atmosphere structure parameter, temperature and relative humidity along vertical path. Comparisons of Karasawa model based on the data obtained from a low-elevation microwave propagation experiment and ITU-R Recommendation model prediction results with evaluation results are shown and discussed. The results show that although the relative humidity effected on optical refractive index of a cell is not principally element at optical wave band, at microwave and millimeter-wave band, the relative humidity and temperature is the major factor impacted on log-amplitude scintillation. Hence, the variations of temperature and relative humidity with height, which can be obtained by experiment (or test) and weather observation method is important for low-elevation satellite communication and microwave remote sensing. A atmosphere structure constant Cn2 model, which varies with height, is presented based on ITU-R and Karasawa amplitude scintillation model, existing ITU-R Cn2 model for optical and meteorologic measured relative humidity and temperature data, at 10~30GHz. In this Cn2 model it is considered that relative humidity and temperature varies with height. The log-amplitude scintillation deviation calculated in terms of the Cn2 model based on humidity and temperature vertical profile compare with values predicted by means of ITU-R and Ortgies model applied to Italsat channels. It is emerged that the calculation results based on the Cn2 model agree almost with prediction results by ITU-R and Ortgies model at 10~30GHz and there is an advantage that relative humidity and temperature varied with height has be considered in the Cn2 model. Therefore, it is shown that the Cn2 model is usable and is more practical.

Paper Details

Date Published: 14 April 2003
PDF: 7 pages
Proc. SPIE 4899, Atmospheric and Oceanic Processes, Dynamics, and Climate Change, (14 April 2003); doi: 10.1117/12.466582
Show Author Affiliations
Ruike Yang, Xidian Univ. (United States)
ZhenSen Wu, Xidian Univ. (China)
Yingle Li, Xidian Univ. (China)

Published in SPIE Proceedings Vol. 4899:
Atmospheric and Oceanic Processes, Dynamics, and Climate Change
Zhaobo Sun; Fei-Fei Jin; Toshiki Iwasaki, Editor(s)

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