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IJRSP Vol.36(5) [October 2007] >


Title: Estimation of cross-polarization due to rain over some stations in India
Authors: Jaiswal, R Sen
Geetha, P
Uma, S
Keywords: Rainfall rate
Attenuation
Cross-polarization
Rain height
Issue Date: Oct-2007
Publisher: CSIR
Abstract: In this paper an attempt has been made to compute cross-polarization of millimeter waves in the 30-35 GHz frequency range due to rain. Laws and Parson’s drop size distributions for oblate spheroid drops at 20ºC ITU-R (2002) model has been used to predict cross-polarization discrimination (XPD) for circular polarization. The study includes a number of earth stations in India, namely, Ahmedabad, Calcutta, Delhi, Gangtok and Jodhpur. Variations of co-polar attenuation with XPD have been shown. Cumulative time distribution of XPD has also been presented. The study reveals that cross-polarization depends on frequency, co-polar attenuation and rainfall rate. Comparison with measurement does not show good agreement although the two show the same trend. Extensive work on cross-polarization is required in the millimeter wave frequency range over a large number of earth stations in India using different drop size distributions and different polarizations.
Page(s): 379-382
ISSN: 0367-8393
Source:IJRSP Vol.36(5) [October 2007]

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