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Oblique frequency domain interferometry measurements using the middle and upper atmosphere radar
Author(s) -
Palmer R. D.,
Fukao S.,
Larsen M. F.,
Yamamoto M.,
Tsuda T.,
Kato S.
Publication year - 1992
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 - 10.1029/92rs01354
Subject(s) - doppler effect , oblique case , optics , spectral line , physics , phase (matter) , computational physics , interferometry , doppler radar , atmosphere (unit) , scattering , meteorology , philosophy , linguistics , quantum mechanics , astronomy
First results are presented from oblique frequency domain interferometry (FDI) measurements conducted using the middle and upper atmosphere radar in Japan in October 1990. Using the idea of Doppler sorting, an equation is derived which shows a parabolic variation of the oblique FDI cross‐spectral phase as a function of Doppler velocity. However, because of the small range of Doppler velocities observed with the measured cross spectra, the phase has an approximate linear variation; that is, the cross spectra sample only a small portion of the parabolic structure and are therefore approximately linear and are shown to follow the model closely. Using the oblique FDI configuration, a comparison is drawn between simultaneous measurements of signal‐to‐noise ratio, coherence, three‐dimensional wind, and profiles of FDI cross spectra. We find that the regions that exhibit a well‐defined scattering layer correspond to those regions of high aspect sensitivity. An explanation is suggested based on the anisotropy of the turbulence.