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Titolo:
Extended radar observations with the frequency radar domain interferometric imaging (FII) technique
Autore:
Luce, H; Yamamoto, M; Fukao, S; Crochet, M;
Indirizzi:
Kyoto Univ, Radio Sci Ctr Space & Atmosphere, Uji, Kyoto 6110011, Japan Kyoto Univ Uji Kyoto Japan 6110011 Atmosphere, Uji, Kyoto 6110011, Japan Univ Toulon & Var, Lab Sondages Electromagnet Environm Terrestre, CNRS, LaGarde, France Univ Toulon & Var La Garde France ronm Terrestre, CNRS, LaGarde, France
Titolo Testata:
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
fascicolo: 10, volume: 63, anno: 2001,
pagine: 1033 - 1041
SICI:
1364-6826(200107)63:10<1033:EROWTF>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHASED-ARRAY SYSTEM; MU RADAR; TROPOSPHERE;
Keywords:
interferometry; MST radars; high resolution; turbulence;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Luce, H Kyoto Univ, Radio Sci Ctr Space & Atmosphere, Uji, Kyoto 6110011, Japan Kyoto Univ Uji Kyoto Japan 6110011 ere, Uji, Kyoto 6110011, Japan
Citazione:
H. Luce et al., "Extended radar observations with the frequency radar domain interferometric imaging (FII) technique", J ATMOS S-P, 63(10), 2001, pp. 1033-1041

Abstract

In this paper, we present high-resolution observations obtained with the Middle and Upper Atmosphere (MU) radar (Shigaraki, Japan, 34.85 degreesN, 136.10 degreesE) using the frequency radar domain interferometric imaging (FII) technique. This technique has recently been introduced for improving therange resolution capabilities of the mesosphere-stratosphere-troposphere (MST) radars which are limited by their minimum pulse length. The Fourier-based imaging, the Capon method have been performed with 5 equally spaced frequencies between 46.25 and 46.75 MHz and with an initial range resolution of 300 m. These results have been compared firstly to results obtained usingthe frequency domain interferometry (FDI) technique with Deltaf = 0.5 MHz and, secondly, to results from a classical Doppler beam swinging (DBS) modeapplied with a range resolution of 150 m. Thin echoing structures could betracked owing to the improved radar range resolution and some complex structures possibly related to Kelvin Helmholtz instabilities have been detected. Indeed, these structures appeared within the core of a wind shear and were associated with intense vertical wind fluctuations. Moreover, a well-defined thin echo layer was found in an altitude range located below the height of the wind shear. The radar observations have not been fully interpretedyet because the radar configuration was not adapted for this kind of studyand because of the lack of complementary information provided by other techniques when the interesting echoing phenomena occurred. However, the results confirm the high potentialities of the FII technique for the study of atmospheric dynamics at small scales. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 30/10/20 alle ore 00:45:34