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| Titel |
Towards multi-purpose IS radar experiments |
| VerfasserIn |
I. I. Virtanen, M. S. Lehtinen, J. Vierinen |
| 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.2281-2289 |
| Datensatznummer |
250016187
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| Publikation (Nr.) |
 copernicus.org/angeo-26-2281-2008.pdf |
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| Zusammenfassung |
The EISCAT incoherent scatter radars routinely perform simultaneous
measurements of E- and F-regions of the ionosphere. In addition several
experiments exist for measuring pulse-to-pulse correlations from the
D-region. However, the D-region experiments have quite limited range extents
and the short lags suffer from F-region echoes, which are difficult to
properly handle with standard decoding methods.
In this paper it is demonstrated with real data how D-region experiments can
be designed to produce continuous lag profiles extending above the F-region
maximum. The large range coverage is attained for all lags shorter than the
longest transmission pulse and it allows one to properly include the F-region
echoes in the analysis. The large coverage is not needed for pulse-to-pulse
lags because E- and F-regions do not have this long correlation times. The
lag profiles with large range extent also provide a useful measurement of the
upper parts of the ionosphere.
The experiments utilise new kind of phase
coding technique, which has estimation accuracy comparable to that of
alternating codes though the code sequence is very short. No special decoding
method is applied to the codes, because the lag profile inversion method
automatically adapts to any kind of transmission codes provided transmission
samples are available.
The computing resources needed for real-time lag profile inversion with two
different kinds of goals are also discussed here: 1) real-time monitoring of
the results and 2) use of inverted lag profiles as a way to permanently store
the data. While it was possible to accomplish real-time monitoring with a
standard high-end desktop workstation, the higher resolution requirement for
permanent data storage purposes is a much more critical task, requiring the
use of larger-scale parallel processing. |
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