New improved algorithm for sky calibration of L-band radiometers JLBARA and ELBARA II

Calibration; Air temperature; Air temperature changes; Brightness temperatures; Calibration algorithm; Experimental data; Germany; Improved algorithm; L-band radiometer; Microwave radiometers; Test site; Algorithms; Atmospheric temperature; Microwave devices; Microwaves; Radiometers; Remote sensing

Abstract :

[en] We propose a new algorithm for sky calibration of the L-band radiometers JLBARA and ELBARA II, introducing the effective transmissivities of the instruments. The suggested approach was tested using experimental data obtained at the Selhausen test site, Germany. It was shown that for JLBARA the effective transmissivities depend strongly on the air temperature and decrease with increasing air temperature, while for ELBARA II such strong dependence was not observed. It was also shown that the effective transmissivities account for the antenna and feed cable loss effects, and for the variations of the radiometer gain due to air temperature changes. The new calibration algorithm reduces significantly the bias of brightness temperature estimates for both radiometers, especially for JLBARA. © 2012 IEEE.

Disciplines :

Environmental sciences & ecology
Earth sciences & physical geography

Author, co-author :

Dimitrov, M.; Research Centre Jülich, Institute of Bio- and Geosciences: Agrosphere (IBG 3), 52425 Jülich, Germany

Kostov, K. G.; Bulgarian Academy of Sciences, Institute of Electronics, 1784 Sofia, Bulgaria

Jonard, François ; Université de Liège - ULiège > Département de géographie > Systèmes d'information géographiques

Jadoon, K. Z.; Research Centre Jülich, Institute of Bio- and Geosciences: Agrosphere (IBG 3), 52425 Jülich, Germany, Water Desalination and Reuse Center, KAUST, Thuwal, 23955-6900, Saudi Arabia

Schwank, M.; German Research Centre for Geosciences, 14473 Potsdam, Germany

Weihermüller, L.; Research Centre Jülich, Institute of Bio- and Geosciences: Agrosphere (IBG 3), 52425 Jülich, Germany

Hermes, N.; Research Centre Jülich, Institute of Bio- and Geosciences: Agrosphere (IBG 3), 52425 Jülich, Germany

Vanderborght, J.; Research Centre Jülich, Institute of Bio- and Geosciences: Agrosphere (IBG 3), 52425 Jülich, Germany

Vereecken, H.; Research Centre Jülich, Institute of Bio- and Geosciences: Agrosphere (IBG 3), 52425 Jülich, Germany

Language :

English

Title :

New improved algorithm for sky calibration of L-band radiometers JLBARA and ELBARA II

Publication date :

2012

Event name :

Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)

Event place :

Villa Mondragone, Italy

Event date :

From 05-09-2012 to 09-03-2012

Audience :

International

Main work title :

12th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)

Publisher :

MicroRad

Peer reviewed :

Peer reviewed

Commentary :

9781467314701

Available on ORBi :

since 23 September 2021

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Bibliography

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M. Schwank et al., "ELBARA II, an L-band radiometer system for soil moisture research," Sens. MDPI, vol. 10, no. 1, pp. 584-612, 2010.
M. Schwank et al., "L-band properties of vine vegetation at the MELBEX III SMOS CallVal Site," in press.
T. Pcllarin et al., "Two-year global simulation of L-band brightness temperatures over land," IEEE Trans. Geosci. Remote Sens., vol. 41, no. 9,pp. 2135-2139, Sep. 2003.
M. Zannoni et al., "TRIS. J. Absolute measurements of the sky brightness temperature at 0.6, 0.82, and 2.5 GHz," The Astrophysical J., vol. 688, 12-23, Nov. 2008.