Ground calibration of SMOS: NIR and CAS

Ground calibration of the calibration subsystems of MIRAS (Microwave Imaging Radiometer using Aperture Synthesis) has been performed. The MIRAS instrument is the payload of European Space Agency's (ESA) Soil Moisture and Ocean Salinity (SMOS) mission. The calibration subsystems are Calibration...

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Bibliographic Details
Main Authors: Colliander, A., Lemmetyinen, J., Uusitalo, J., Suomela, J., Veijola, K., Kontu, A., Kemppainen, S., Pihlflyckt, J., Rautiainen, K., Hallikainen, M., Lahtinen, J.
Format: Conference Proceeding
Language:English
Subjects:
Apertures
Calibration
Content addressable storage
Instruments
Microwave imaging
Microwave radiometry
Network synthesis
Noise level
Sea measurements
Soil measurements
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Summary:Ground calibration of the calibration subsystems of MIRAS (Microwave Imaging Radiometer using Aperture Synthesis) has been performed. The MIRAS instrument is the payload of European Space Agency's (ESA) Soil Moisture and Ocean Salinity (SMOS) mission. The calibration subsystems are Calibration Subsystem (CAS), which is a noise distribution network, and Noise Injection Radiometer (NIR), which measures the noise levels of CAS and the average incident brightness temperature. This paper presents the used measurement approaches, related uncertainties, and the calibration results for the NIR and CAS. The results show that in spite of uncertainties, the characterization methods allow accurate ground calibration of the two subsystems. The performance of both subsystems meet the requirements.
ISSN:2153-6996
2153-7003
DOI:10.1109/IGARSS.2007.4423632