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| Titel |
Interferometric evidence for the observation of ground backscatter originating behind the CUTLASS coherent HF radars |
| VerfasserIn |
S. E. Milan, T. B. Jones, T. R. Robinson, E. C. Thomas, T. K. Yeoman |
| 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 ; 15, no. 1 ; Nr. 15, no. 1, S.29-39 |
| Datensatznummer |
250012571
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| Publikation (Nr.) |
 copernicus.org/angeo-15-29-1997.pdf |
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| Zusammenfassung |
| Interferometric techniques allow the
SuperDARN coherent HF radars to determine the elevation angles of returned
backscatter, giving information on the altitude of the scatter volume, in the
case of ionospheric backscatter, or the reflection altitude, in the case of
ground backscatter. Assumptions have to be made in the determination of
elevation angles, including the direction of arrival, or azimuth, of the
returned signals, usually taken to be the forward look-direction (north) of the
radars, specified by the phasing of the antenna arrays. It is shown that this
assumption is not always valid in the case of ground backscatter, and that
significant returns can be detected from the backward look-direction of the
radars. The response of the interferometer to backscatter from behind the radar
is modelled and compared with observations. It is found that ground backscatter
from a field-of-view that is the mirror image of the forward-looking
field-of-view is a common feature of the observations, and this interpretation
successfully explains several anomalies in the received backscatter. |
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