A 22-GHz Mobile Microwave Radiometer (MobRa) for the Study of Middle Atmospheric Water Vapor

Motte, Erwan; Ricaud, P.; Gabard, B.; Niclas, M.; Gangneron, Fabrice

doi:10.1109/tgrs.2008.2000626

Cited by 12 publications

(11 citation statements)

References 25 publications

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“…There are two different methods to determine the elevation pointing: the sky-and the Sun scanning. The sky scanning is a well known method to determine the pointing of microwave radiometers, compare Motte et al (2008), while the more precise Sun scanning is adopted from radioastronomy. In the following section results from the Summer 2009 measurement campaign at Bern are presented.…”

Section: Validation Of Instrumental Pointingmentioning

confidence: 99%

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MIAWARA-C, a new ground based water vapor radiometer for measurement campaigns

2010

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Abstract. In this paper a new 22 GHz water vapor spectroradiometer which has been specifically designed for profile measurement campaigns of the middle atmosphere is presented. The instrument is of a compact design and has a simple set up procedure. It can be operated as a standalone instrument as it maintains its own weather station and a calibration scheme that does not rely on other instruments or the use of liquid nitrogen. The optical system of MIAWARA-C combines a choked gaussian horn antenna with a parabolic mirror which reduces the size of the instrument in comparison with currently existing radiometers. For the data acquisition a correlation receiver is used together with a digital cross correlating spectrometer. The complete backend section, including the computer, is located in the same housing as the instrument. The receiver section is temperature stabilized to minimize gain fluctuations. Calibration of the instrument is achieved through a balancing scheme with the sky used as the cold load and the tropospheric properties are determined by performing regular tipping curves. Since MIAWARA-C is used in measurement campaigns it is important to be able to determine the elevation pointing in a simple manner as this is a crucial parameter in the calibration process. Here we present two different methods; scanning the sky and the Sun. Finally, we report on the first spectra and retrieved water vapor profiles acquired during the Lapbiat campaign at the Finnish Meteorological Institute Arctic Research Centre in Sodankylä, Finland. The performance of MIAWARA-C is validated here by comparison of the presented profiles against the equivalent profiles from the Microwave Limb Sounder on the EOS/Aura satellite.

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Section: Validation Of Instrumental Pointingmentioning

confidence: 99%

“…There have also been several new developments in recent years, e.g. the instruments on the Zugspitze (Germany), Kuehlungsborn (Germany), Karlsruhe (Germany) and the Mobile Microwave Radiometer operated by the University of Toulouse (France) (Motte et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

MIAWARA-C, a new ground based water vapor radiometer for measurement campaigns

2010

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“…After 2 frequency downscalings, the radio frequency (RF) signal enters a FFT (Fast Fourier Transform) spectrometer centered at 500 MHz over a bandwidth from 0 to 1 GHz with a spectral resolution of 64 kHz. Based upon the same measurement principle as described in Motte et al (2008), the radiometer, operating in a single side band (SSB) mode, can measure a spectrum in a balancing mode between low (20 • -30 • ) elevation angles and zenith angle every 15 min. The instrument is automated and currently installed inside a dedicated shelter of 3 × 1.5 × 2.1 m 3 .…”

Section: Passive Remote Sensing Measurementsmentioning

confidence: 99%

Maïdo observatory: a new high-altitude station facility at Reunion Island (21° S, 55° E) for long-term atmospheric remote sensing and in situ measurements

et al. 2013

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“…La grande majorité des radiomètres micro-ondes installés au sol et dédiés à la vapeur d'eau utilisent la transition spectroscopique (6 16 -5 23 ) à 22,235 GHz (par exemple, Westwater et al, 2004 ;Motte et al, 2008) Une approche statistique (régression linéaire) a été utilisée pour calculer les profils verticaux à partir des spectres étalonnés (température de brillance, T B , température qu'aurait un corps noir émettant le même flux de rayonnement que l'objet -en l'occurrence l'atmosphère -observé) mesurés par le radiomètre. L'algorithme d'inversion s'appuie sur un millier de radiosondages à proximité de sites où l'instrument a été installé, en l'occurrence au pic du Midi pour une campagne de validation en 2008 et au Dôme C depuis 2009.…”

Section: Le Programme Hamstradunclassified