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Some experimental results on bistatic scatter from rain

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1 Author(s)
Sakagami, S. ; Nippon Telegraph and Telephone Public Corporation, Kanagawa-ken, Japan

A bistatic scatter experiment was conducted on a 55.2-km scatter path in Japan, at a frequency of 6.72 GHz, continuously from August 1975 to September 1977. In this bistatic scatter experiment the forward scatter experiment and a direct path measurement were made simultaneously, and a scanning-beam experiment was performed during two rainfalls. Investigations were made on the relationship between the equivalent radar reflectivity factorZ_{e}for a 2.3-km common volume height above sea level and the surface rain rateR(mm/h) directly under the common volume, and the distribution ofZ_{e}. TheZ_{e}-Rrelationship was found to beZ_{e} = 151.4 R^{1.45}on an average for total data including all rain types. The distribution ofZ_{e}can be approximated by the lognormal distribution for a rainy period. The directivity of scattering from an ensemble of raindrops was measured by scanning the beam from a horn antenna in the vertical plane. For practical purposes the directivity was found to be similar to that of an electric dipole.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:28 ,  Issue: 2 )

Date of Publication:

Mar 1980

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