Calibrating airborne measurements of airspeed, pressure and temperature using a Doppler laser air-motion sensor
A new laser air-motion sensor measures the true airspeed with a standard uncertainty of less than 0.1 m s<sup>−1</sup> and so reduces uncertainty in the measured component of the relative wind along the longitudinal axis of the aircraft to about the same level. The calc...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-09-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/7/3215/2014/amt-7-3215-2014.pdf |
| _version_ | 1828237133393952768 |
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| author | W. A. Cooper S. M. Spuler M. Spowart D. H. Lenschow R. B. Friesen |
| author_facet | W. A. Cooper S. M. Spuler M. Spowart D. H. Lenschow R. B. Friesen |
| author_sort | W. A. Cooper |
| collection | DOAJ |
| description | A new laser air-motion sensor measures the true airspeed with a
standard uncertainty of less than 0.1 m s<sup>−1</sup>
and so reduces uncertainty in the measured component of the relative
wind along the longitudinal axis of the aircraft to about the same
level. The calculated pressure expected from that airspeed at the
inlet of a pitot tube then provides a basis for calibrating the
measurements of dynamic and static pressure, reducing standard
uncertainty in those measurements to less than 0.3 hPa and the
precision applicable to steady flight conditions to about
0.1 hPa. These improved measurements of pressure, combined with
high-resolution measurements of geometric altitude from the global positioning system, then indicate (via integrations of the
hydrostatic equation during climbs and descents) that the offset and
uncertainty in temperature measurement for one research aircraft are
+0.3 ± 0.3 °C. For airspeed, pressure and temperature,
these are significant reductions in uncertainty vs. those obtained
from calibrations using standard techniques. Finally, it is shown
that although the initial calibration of the measured static and
dynamic pressures requires a measured temperature, once calibrated
these measured pressures and the measurement of airspeed
from the new laser air-motion sensor
provide a measurement of temperature that does not depend on
any other temperature sensor. |
| first_indexed | 2024-04-12T20:44:26Z |
| format | Article |
| id | doaj.art-0cf069cfe3db478a80bc264c4db4e0ba |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-04-12T20:44:26Z |
| publishDate | 2014-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-0cf069cfe3db478a80bc264c4db4e0ba2022-12-22T03:17:19ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482014-09-01793215323110.5194/amt-7-3215-2014Calibrating airborne measurements of airspeed, pressure and temperature using a Doppler laser air-motion sensorW. A. Cooper0S. M. Spuler1M. Spowart2D. H. Lenschow3R. B. Friesen4National Center for Atmospheric Research, Boulder CO, USANational Center for Atmospheric Research, Boulder CO, USANational Center for Atmospheric Research, Boulder CO, USANational Center for Atmospheric Research, Boulder CO, USANational Center for Atmospheric Research, Boulder CO, USAA new laser air-motion sensor measures the true airspeed with a standard uncertainty of less than 0.1 m s<sup>−1</sup> and so reduces uncertainty in the measured component of the relative wind along the longitudinal axis of the aircraft to about the same level. The calculated pressure expected from that airspeed at the inlet of a pitot tube then provides a basis for calibrating the measurements of dynamic and static pressure, reducing standard uncertainty in those measurements to less than 0.3 hPa and the precision applicable to steady flight conditions to about 0.1 hPa. These improved measurements of pressure, combined with high-resolution measurements of geometric altitude from the global positioning system, then indicate (via integrations of the hydrostatic equation during climbs and descents) that the offset and uncertainty in temperature measurement for one research aircraft are +0.3 ± 0.3 °C. For airspeed, pressure and temperature, these are significant reductions in uncertainty vs. those obtained from calibrations using standard techniques. Finally, it is shown that although the initial calibration of the measured static and dynamic pressures requires a measured temperature, once calibrated these measured pressures and the measurement of airspeed from the new laser air-motion sensor provide a measurement of temperature that does not depend on any other temperature sensor.http://www.atmos-meas-tech.net/7/3215/2014/amt-7-3215-2014.pdf |
| spellingShingle | W. A. Cooper S. M. Spuler M. Spowart D. H. Lenschow R. B. Friesen Calibrating airborne measurements of airspeed, pressure and temperature using a Doppler laser air-motion sensor Atmospheric Measurement Techniques |
| title | Calibrating airborne measurements of airspeed, pressure and temperature using a Doppler laser air-motion sensor |
| title_full | Calibrating airborne measurements of airspeed, pressure and temperature using a Doppler laser air-motion sensor |
| title_fullStr | Calibrating airborne measurements of airspeed, pressure and temperature using a Doppler laser air-motion sensor |
| title_full_unstemmed | Calibrating airborne measurements of airspeed, pressure and temperature using a Doppler laser air-motion sensor |
| title_short | Calibrating airborne measurements of airspeed, pressure and temperature using a Doppler laser air-motion sensor |
| title_sort | calibrating airborne measurements of airspeed pressure and temperature using a doppler laser air motion sensor |
| url | http://www.atmos-meas-tech.net/7/3215/2014/amt-7-3215-2014.pdf |
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