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| Titel |
Rainfall measurement from the opportunistic use of an Earth–space link in the Ku band |
| VerfasserIn |
L. Barthes, C. Mallet |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 8 ; Nr. 6, no. 8 (2013-08-29), S.2181-2193 |
| Datensatznummer |
250085048
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| Publikation (Nr.) |
 copernicus.org/amt-6-2181-2013.pdf |
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| Zusammenfassung |
The present study deals with the development of a low-cost
microwave device devoted to the measurement of average rain rates observed
along Earth–satellite links, the latter being characterized by a
tropospheric path length of a few kilometres. The ground-based power
measurements, which are made using the Ku-band television transmissions from
several different geostationary satellites, are based on the principle that
the atmospheric attenuation produced by rain encountered along each
transmission path can be used to determine the path-averaged rain rate. This
kind of device could be very useful in hilly areas where radar data are not
available or in urban areas where such devices could be directly placed in
homes by using residential TV antenna.
The major difficulty encountered with this technique is that of retrieving
rainfall characteristics in the presence of many other causes of received
signal fluctuation, produced by atmospheric scintillation, variations in
atmospheric composition (water vapour concentration, cloud water content) or
satellite transmission parameters (variations in emitted power, satellite
pointing). In order to conduct a feasibility study with such a device, a
measurement campaign was carried out over a period of five months close to
Paris.
The present paper proposes an algorithm based on an artificial neural
network, used to identify dry and rainy periods and to model received signal
variability resulting from effects not related to rain. When the altitude of
the rain layer is taken into account, the rain attenuation can be inverted
to obtain the path-averaged rain rate. The rainfall rates obtained from this
process are compared with co-located rain gauges and radar measurements
taken throughout the full duration of the campaign, and the most significant
rainfall events are analysed. |
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