التفاصيل البيبلوغرافية
| العنوان: |
Radiometric measurements of cloud attenuation at a tropical location in India. |
| المؤلفون: |
Das, Saurabh1 das.saurabh01@gmail.com, Chakraborty, Swastika2 swas_jis@yahoo.com, Maitra, Animesh1 animesh.maitra@gmail.com |
| المصدر: |
Journal of Atmospheric & Solar-Terrestrial Physics. Dec2013, Vol. 105-106, p97-100. 4p. |
| مصطلحات موضوعية: |
*CLOUD dynamics, *RADIOMETRIC methods, *ATTENUATION (Physics), *RADIO wave propagation, *SIGNAL processing, *ENERGY bands |
| مصطلحات جغرافية: |
TROPICS, INDIA |
| مستخلص: |
Abstract: 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 ~4dB and ~12dB 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. [Copyright &y& Elsevier] |
| قاعدة البيانات: |
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