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| Titel |
Validation of a new signal processing scheme for the MST radar at Aberystwyth |
| VerfasserIn |
D. A. Hooper, J. Nash, T. Oakley, M. Turp |
| 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. 11 ; Nr. 26, no. 11 (2008-10-21), S.3253-3268 |
| Datensatznummer |
250016269
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| Publikation (Nr.) |
 copernicus.org/angeo-26-3253-2008.pdf |
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| Zusammenfassung |
| This paper describes a new signal processing scheme for the 46.5 MHz
Doppler Beam Swinging wind-profiling radar at Aberystwyth, in the
UK. Although the techniques used are similar to those already
described in literature – i.e. the identification of multiple signal
components within each spectrum and the use of radial- and
time-continuity algorithms for quality-control purposes – it is shown
that they must be adapted for the specific meteorological environment
above Aberystwyth. In particular they need to take into account the
three primary causes of unwanted signals: ground clutter,
interference, and Rayleigh scatter from hydrometeors under stratiform
precipitation conditions. Attention is also paid to the fact that
short-period gravity-wave activity can lead to an invalidation of the
fundamental assumption of the wind field remaining stationary over the
temporal and spatial scales encompassed by a cycle of
observation. Methods of identifying and accounting for such conditions
are described. The random measurement error associated with horizontal
wind components is estimated to be 3.0–4.0 m s−1 for single
cycle data. This reduces to 2.0–3.0 m s−1 for data averaged
over 30 min. The random measurement error associated with vertical
wind components is estimated to be 0.2–0.3 m s−1. This cannot
be reduced by time-averaging as significant natural variability is
expected over intervals of just a few minutes under conditions of
short-period gravity-wave activity. |
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