Abstract
The spatial and temporal characteristics of rainfall and raindrop size distribution for terrestrial or space to earth communication link affects the perfromace of radio and radar communication system operating above 10 GHz in the temperate climate and above 7 GHz in tropical and equatorial climate. The rain drop size distribution plays an important role for limiting the performance of communiation system due to different rain attenuation and polarization of radio signals at mm wave rfequuencies. The single point measurement of rainfall rate as well as rain drop distribution, and non-uniform rainfall rate characteristics of terrestrial radio link causes difference in the rain attenuation measured value at mm wave frequencies from the rain attenuation based on raindrop size distribution or rainfall rate. In this paper, model for cross-polarisation discrimination (XPD) due to rain rate at 20 GHz and 30 GHz have been developed based on rain attenuation measurement of LOS link for vertical and horizontal polarisation signals. The variation of XPD with rain rate and co-polar attenuation have been discussed for understanding the effect of rain drop size distribution at 20/ 30 GHz.
Published Version
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