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Beam broadening effect on Doppler spectral width of wind profiler
Author(s) -
Chen MengYuan,
Chu YenHsyang
Publication year - 2011
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2011rs004704
Subject(s) - doppler broadening , doppler effect , azimuth , beam (structure) , spectral width , physics , context (archaeology) , spectral line , wind shear , optics , computational physics , homogeneous broadening , anisotropy , wind speed , geology , meteorology , paleontology , astronomy , wavelength
In this study, the beam broadening effect on Doppler spectrum was investigated with theoretical derivation and numerical simulation. It is found that vertical wind may cause a beam broadening spectrum not in exact Gaussian shape. Moreover, the azimuth angle variation of the beam broadening spectral width in the presence of vertical wind is more significant than that in the absence of the vertical wind. The widths of the beam broadening spectra for oblique beams pointing in the opposite directions are different. Further, wind shear effect on the azimuth anisotropy of the beam broadening spectral width is also studied in this article. In the context of three‐dimensional wind field with vertical shear of horizontal wind, an analytic expression of the beam broadening spectral width is proposed. A comparison between the analytic expression and simulation result suggests that the expression is applicable in general.