Rain attenuation of millimeter waves observed simultaneously by radiometer and bistatic radar

Millimeter wave propagation depends mainly on the meteorological parameters like temperature, pressure, humidity and rain rate. The major difficulty in such measurements is that a sufficiently large number of sensors are needed for a reliable estimate of such effects. The results for a long path can show up only the integrated effect of attenuation but cannot reveal the finer structure of the attenuation profile originating from different points along the path. This prompted the authors to undertake a simultaneous MM wave propagation study at 94 GHz for a very short path, in the bistatic radar mode and by a zenith looking radiometer tuned at 22.235 GHz. The results obtained from January, 1987 to September 1988 are presented.<
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