Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8139520 | Journal of Atmospheric and Solar-Terrestrial Physics | 2018 | 10 Pages |
Abstract
Efficient use of satellite communication in tropical regions demands proper characterization of rain attenuation, particularly, in view of the available popular propagation models which are mostly based on temperate climatic data. Thus rain attenuations at frequencies 22.234, 23.834 and 31.4/30â¯GHz over two tropical locations Kolkata (22.57°N, 88.36°E, India) and Belem (1.45°S, 48.49° W, Brazil), have been estimated for the year 2010 and 2011, respectively. The estimation has been done utilizing ground-based disdrometer observations and radiometric measurements over Earth-space path. The results show that rain attenuation estimations from radiometric data are reliable only at low rain rates (<30â¯mm/h). However, the rain attenuation estimations from disdrometer measurements show good agreement with the ITU-R model, even at high rain rates (upto100â¯mm/h). Despite having significant variability in terms of drop size distribution (DSD), the attenuation values calculated from DSD data (disdrometer measurements) at Kolkata and Belem differ a little for the rain rates below 30â¯mm/h. However, the attenuation values, obtained from radiometric measurements at the two places, show significant deviations ranging from 0.54â¯dB to 3.2â¯dB up to a rain rate of 30â¯mm/h, on account of different rain heights, mean atmospheric temperatures and climatology of the two locations.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geophysics
Authors
Tuhina Halder, Arpita Adhikari, Animesh Maitra,