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absorption altitude amplitude analysis antenna noise temperature approximately average band bandwidth beacon bright-band calculated CCIR coefficients correlation crosspolarization cumulative distribution curves density distance diversity diversity gain Doppler duct effects EISCAT electron elevation angle equation error event experimental fading field strength fluctuations foF2 frequency function given gradient height horizontal hydrometeors integration inversion ionospheric Martlesham Martlesham Heath measured median method microwave mode multipath noise temperature observed obtained oscillations parameters particles path length pathloss percentage phase phase jitter plane polarisation polarization predicted propagation radar radio waves radiometer radiosonde rain attenuation rain intensity raindrops rainfall rate range ratio reflection refractive index region satellite scattering shown in Figure shows signal level site diversity slant path spectral spectrum station statistics surface technique tion Trans transmission transmitting troposphere values variation velocity vertical virtual height waveguide wavelength wind worst month