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10GHz RADIO RAY amplitude antenna heights antenna temperature atmospheric attenuation beam curvature beam spread Beckmann brightness temperature calculated calibration CLOUD ATTENUATIONS coefficient components curves detectable detector determined diffraction fading diversity reception Dougherty duct earth terminal experimental Fading Due fading mechanisms frequency diversity ground terminal horizontal Hoyt distribution index gradients Initial Elevation Angle iso-echo contours KILOMETERS maximum meteorological microwave fading mm/hr multipath fading observed optical parameters particle path length difference Power Fading precipitation attenuation precipitation rate prediction propagation path radio waves radius rainfall attenuation rainfall rate range ray path Rayleigh Rayleigh distribution received refractive index refractive index gradients RESEARCH LABORATORIES satellite system satellite-earth scattering shown in figure signal signal-to-noise ratio smoke space diversity storm surface system noise temperature technique terminal antenna terrain theoretical transmission loss transmitter tropospheric units/km variability variation water vapor wavelength Z-R relationship