Correction for Rain Path Specific and Differential Attenuation of X-Band Dual-Polarization Observations
The accuracy of attenuation correction for X-band reflectivity (Z H ) and differential reflectivity (Z DR ) measurements in rainfall is analyzed using coincident X-band and S-band polarimetric radar observations collected during the International H 2 O Project in the period of May-June 2002 at north...
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Published in | IEEE transactions on geoscience and remote sensing Vol. 44; no. 9; pp. 2470 - 2480 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
New York, NY
IEEE
01.09.2006
Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subjects | |
Online Access | Get full text |
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Summary: | The accuracy of attenuation correction for X-band reflectivity (Z H ) and differential reflectivity (Z DR ) measurements in rainfall is analyzed using coincident X-band and S-band polarimetric radar observations collected during the International H 2 O Project in the period of May-June 2002 at northwestern Oklahoma. Two distinct attenuation correction techniques that use the differential propagation phase shift (Phi DP ) information, which is not a power-dependent measurement, as a means to provide independent estimates of path-integrated attenuation are assessed. The study is facilitated by nonattenuated X-band Z H and Z DR profiles simulated based on raindrop size distribution parameters retrieved from matched multiparameter (Z H , Z DR , and K DP ) S-band observations. The major outcome of this assessment is that Phi DP -based attenuation correction for both techniques can reach almost unbiased measurements (within 5% mean relative error) and low random error (15-20% relative standard deviation). The study shows moderate differences in the error statistics of the evaluated techniques. The sensitivity of attenuation correction uncertainty with respect to the assumed variability in raindrops' oblateness-size relation and the noise in Phi DP measurement is also shown |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0196-2892 1558-0644 |
DOI: | 10.1109/TGRS.2006.873204 |