94 GHZ BISTATIC SCATTERING IN RAIN

This paper presents measurements of bistatic scattering of electromagn etic waves by rain at 94 GHz in vertical polarization, The experiment was done using transmitting and receiving rotating antennas of 312 m d istance. Both antennas could be rotated independently in horizontal pl ane enabling the measurement of bistatic scattering angles from -120 d egrees to +120 degrees. The raindrop size distributions were measured by a distrometer located close to the propagation path, Since narrow b eam antennas were employed and path length was relatively short, the s cattering volume was small and the rain statistics could be assumed ho mogeneous over the scattering volume. We show that computations using the first order of multiple scattering hypothesis and Mie theory for s pherical drops are in good agreement with measured experimental values .