NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Second-order multiple-scattering theory associated with backscattering enhancement for a millimeter wavelength weather radar with a finite beam widthEffects of multiple scattering on reflectivity are studied for millimeter wavelength weather radars. A time-independent vector theory, including up to second-order scattering, is derived for a single layer of hydrometeors of a uniform density and a uniform diameter. In this theory, spherical waves with a Gaussian antenna pattern are used to calculate ladder and cross terms in the analytical scattering theory. The former terms represent the conventional multiple scattering, while the latter terms cause backscattering enhancement in both the copolarized and cross-polarized components. As the optical thickness of the hydrometeor layer increases, the differences from the conventional plane wave theory become more significant, and essentially, the reflectivity of multiple scattering depends on the ratio of mean free path to radar footprint radius. These results must be taken into account when analyzing radar reflectivity for use in remote sensing.
Document ID
20060044034
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kobayashi, Satoru
Tanelli, Simone
Im, Eastwood
Date Acquired
August 23, 2013
Publication Date
December 22, 2005
Publication Information
Publication: Radio Science
Volume: 40
Subject Category
Communications and Radar
Distribution Limits
Public
Copyright
Other
Keywords
radar reflectivity
multiple scattering