کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8140337 1523632 2013 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Radiometric measurements of cloud attenuation at a tropical location in India
ترجمه فارسی عنوان
اندازه گیری های رادیومتری ضعیف شدن ابر در مکان گرمسیری در هند
کلمات کلیدی
ضعف ابر، رادیومتر، محتوای مایع آب، منطقه گرمسیری،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
چکیده انگلیسی
The effect of the earth's atmosphere on radio waves propagating over an earth-space path is a major concern in the design and performance of satellite communications systems. Some characteristics of cloud and its effect on signal propagation has been studied using multi-wavelength radiometer at a tropical location of Kolkata, India. The liquid water content profile shows high values at higher altitude during pre-monsoon season indicating the presence of cloud above zero degree isotherm. Significant change in attenuation value is observed for same liquid water content due to change in temperature and accordingly a suitable relationship is obtained for the present location. The measurements indicate that ~4 dB and ~12 dB attenuation is caused due to cloud at 0.01% outage probability at the Ka and V band, respectively. ITU-R model is found to be overestimating the cloud attenuation over this location and indicate the need for more experimental measurement from tropical region.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Atmospheric and Solar-Terrestrial Physics - Volumes 105–106, December 2013, Pages 97-100
نویسندگان
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