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| Titel |
Calibration of 3-D wind measurements on a single-engine research aircraft |
| VerfasserIn |
C. Mallaun, A. Giez, R. Baumann |
| 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 ; 8, no. 8 ; Nr. 8, no. 8 (2015-08-12), S.3177-3196 |
| Datensatznummer |
250116523
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| Publikation (Nr.) |
 copernicus.org/amt-8-3177-2015.pdf |
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| Zusammenfassung |
| An innovative calibration method for the wind speed measurement using
a boom-mounted Rosemount model 858 AJ air velocity probe is introduced. The
method is demonstrated for a sensor system installed on a medium-size
research aircraft which is used for measurements in the atmospheric boundary
layer. The method encounters a series of coordinated flight manoeuvres to
directly estimate the aerodynamic influences on the probe and to calculate
the measurement uncertainties. The introduction of a differential Global
Positioning System (DGPS) combined with a high-accuracy inertial reference
system (IRS) has brought major advances to airborne measurement techniques.
The exact determination of geometrical height allows the use of the pressure
signal as an independent parameter. Furthermore, the exact height information
and the stepwise calibration process lead to maximum accuracy. The results
show a measurement uncertainty for the aerodynamic influence of the dynamic
and static pressures of 0.1 hPa. The applied parametrisation does not
require any height dependencies or time shifts. After extensive flight tests
a correction for the flow angles (attack and sideslip angles) was found,
which is necessary for a successful wind calculation. A new method is
demonstrated to correct for the aerodynamic influence on the sideslip angle.
For the three-dimensional (3-D) wind vector (with 100 Hz resolution)
a novel error propagation scheme is tested, which determines the measurement
uncertainties to be 0.3 m s−1 for the horizontal and 0.2 m s−1
for the vertical wind components. |
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