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| Titel |
Three-dimensional radar imaging of atmospheric layer and turbulence structures using multiple receivers and multiple frequencies |
| VerfasserIn |
J.-S. Chen, J. Furumoto, M. Yamamoto |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 8 ; Nr. 32, no. 8 (2014-08-05), S.899-909 |
| Datensatznummer |
250121089
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| Publikation (Nr.) |
 copernicus.org/angeo-32-899-2014.pdf |
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| Zusammenfassung |
| The pulsed, beamwidth-limited atmospheric radar suffers from a finite
resolution volume, making it difficult to resolve the small-scale
irregularity structure of refractive index (or clear-air turbulence) in the
scattering region. Multi-receiver and multi-frequency imaging techniques were
thus proposed to improve the spatial resolution of the measurements in the
finite resolution volume. The middle and upper atmosphere radar (MUR;
34.85° N, 136.10° N) possesses the capabilities of 5
frequencies, ranging from 46 MHz to 47 MHz, and up to 25 receivers to carry
out the imaging techniques. In this paper, we exhibit the three-dimensional
(3-D) radar imaging utilizing five frequencies and 19 receivers of the MUR. The
Capon method was employed for the process of imaging, and examinations of a
wavy layer and turbulent structures were made, in which the spatial weighting
effect on the imaging were mitigated beforehand. Information such as echo
center and structure morphology in the resolution volume was then extracted.
For example, the location distribution of echo centers could imply the
traveling orientation of the wavy layer, which was correspondent with
horizontal wind direction. Such information of wavy layer structure was more
difficult to disclose without removal of the spatial weighting effect. This
paper demonstrates an advanced application of 3-D radar imaging to some
practical atmospheric phenomena. |
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