Title :
Ground calibration of SMOS: NIR and CAS
Author :
Colliander, Andreas ; Lemmetyinen, Juha ; Uusitalo, Josu ; Suomela, Jani ; Veijola, Katriina ; Kontu, Anna ; Kemppainen, Sami ; Pihlflyckt, Jörgen ; Rautiainen, Kimmo ; Hallikainen, Martti ; Lahtinen, Janne
Author_Institution :
Helsinki Univ. of Technol., Helsinki
Abstract :
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.
Keywords :
calibration; geophysical techniques; radar imaging; radar interferometry; remote sensing by radar; CAS; MIRAS; NIR; SMOS; aperture synthesis; average incident brightness temperature; calibration subsystem; ground calibration; microwave imaging radiometer; noise distribution network; noise injection radiometer; soil moisture and ocean salinity mission; Apertures; Calibration; Content addressable storage; Instruments; Microwave imaging; Microwave radiometry; Network synthesis; Noise level; Sea measurements; Soil measurements;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2007. IGARSS 2007. IEEE International
Conference_Location :
Barcelona
Print_ISBN :
978-1-4244-1211-2
Electronic_ISBN :
978-1-4244-1212-9
DOI :
10.1109/IGARSS.2007.4423632
