Details

Autor(en) / Beteiligte

• Colliander, A.
• Lemmetyinen, J.
• Uusitalo, J.
• Suomela, J.
• Veijola, K.
• Kontu, A.
• Kemppainen, S.
• Pihlflyckt, J.
• Rautiainen, K.
• Hallikainen, M.
• Lahtinen, J.

Titel

Ground calibration of SMOS: NIR and CAS

Ist Teil von

• 2007 IEEE International Geoscience and Remote Sensing Symposium, 2007, p.3631-3634

Ort / Verlag

IEEE

Erscheinungsjahr

2007

Link zum Volltext

• IEEE_Xplore

Quelle

IEEE Electronic Library (IEL)

Beschreibungen/Notizen

• 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.