1. Some results on SMOS-MIRAS calibration and Imaging
- Author
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McMulan, K., Brown, N., Anterrieu, E., Oliva, R., Martín Porqueras, F., Gutierrez, A., Barbosa, J., Martín Neira, Manuel, Corbella Sanahuja, Ignasi, Torres Torres, Francisco, Cabot, F., Duffo Ubeda, Núria, Closa, J., Kainulainen, J., Castro, R., Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions, Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció, and Universitat Politècnica de Catalunya. RF&MW - Grup de Recerca de sistemes, dispositius i materials de RF i microones
- Subjects
Radiometer ,Astrophysics::Instrumentation and Methods for Astrophysics ,Signal theory (Telecommunication) ,Enginyeria de la telecomunicació [Àrees temàtiques de la UPC] ,Temperature measurement ,Noise (electronics) ,Physics::Geophysics ,Senyal, Teoria del (Telecomunicació) ,Amplitude ,MIRAS ,Brightness temperature ,Calibration ,Environmental science ,Satellite ,Visibility ,Radiometry ,Physics::Atmospheric and Oceanic Physics ,Remote sensing ,SMOS - Abstract
After the six-month long In-Orbit Commissioning Phase (IOCP) the SMOS satellite started to work in its fully operational mode. During the IOCP, the payload MIRAS was completely characterized, both in short- and long-term, and the optimum calibration rate for in-flight operation was established. The results show that the amplitude of the visibility is very stable, thus allowing a very low calibration rate, and that the phase has a systematic and periodic variation, easily tracked with short but frequent internal calibration sequences. Absolute calibration for antenna temperature is carried out by external maneuvers to account for drift in the reference Noise Injection Radiometer. Brightness temperature images of good quality are obtained by inverting the calibrated visibility. The images show features compatible with ocean salinity over ocean and soil moisture over land.
- Published
- 2010