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| Titel |
Phase calibration approaches for radar interferometry and imaging configurations: equatorial spread F results |
| VerfasserIn |
J. L. Chau, D. L. Hysell, K. M. Kuyeng, F. R. Galindo |
| 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 ; 26, no. 8 ; Nr. 26, no. 8 (2008-08-05), S.2333-2343 |
| Datensatznummer |
250016192
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| Publikation (Nr.) |
 copernicus.org/angeo-26-2333-2008.pdf |
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| Zusammenfassung |
| In recent years, more and more radar systems with
multiple-receiver antennas are being used to study the atmospheric and
ionospheric irregularities with either interferometric and/or imaging
configurations. In such systems, one of the major challenges is to know the
phase offsets between the different receiver channels. Such phases are
intrinsic to the system and are due to different cable lengths, filters,
attenuators, amplifiers, antenna impedance, etc. Moreover, such phases change
as function of time, on different time scales, depending on the specific
installation. In this work, we present three approaches using natural targets
(radio stars, meteor-head and meteor trail echoes) that allow either an
absolute or relative phase calibration. In addition, we present the results
of using an artificial source (radio beacon) for a continuous calibration
that complements the previous approaches. These approaches are robust and
good alternatives to other approaches, e.g. self-calibration techniques
using known data features, or for multiple-receiver configurations constantly
changing their receiving elements. In order to show the good performance of
the proposed phase calibration techniques, we present new radar imaging
results of equatorial spread F (ESF) irregularities. Finally we introduce a
new way to represent range-time intensity (RTI) maps color coded with the
Doppler information. Such modified map allows the identification and
interpretation of geophysical phenomena, previously hidden in conventional
RTI maps, e.g. the time and altitude of occurrence of ESF irregularities
pinching off from the bottomside and their respective Doppler velocity. |
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