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IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 46, 1644-1651, 2008
How Does Multiple Scattering Affect the Spaceborne W-Band Radar Measurements at Ranges Close to and Crossing the Sea-Surface Range?
A. Battaglia, and C. Simmer
Abstract
A radar simulator capable of treating multiplebreakscattering
effects has been upgraded to include the interaction
with a Kirchoff surface, which realistically reproduces
the effect of water surfaces. Multiple-scattering effects explain
in a straightforward way some peculiar features of the first
images delivered by the 94-GHz cloud-profiling radar onboard
the CloudSat, overpassing precipitating systems. The reflectivity
profiles without the usual peaks at surface range are found to
be distinctive signatures of strong multiple scattering. Moreover,
multiple scattering is responsible for producing long signal tails at
apparent ranges far below the surface with a strong sensitivity on
the microphysical assumptions of the icy segment of the cloud. The
estimates of multiple-scattering enhancement at surface and close
to the surface range and the saturation levels for simplified precipitating
profiles for both CloudSat and EarthCARE configurations
are provided.
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