2024-03-29T08:38:10Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1886952023-01-03T12:52:44Zcom_10261_123com_10261_8col_10261_376
00925njm 22002777a 4500
dc
Corbella, Ignasi
author
Torres, Francesc
author
Duffo, Nuria
author
Durán, Israel
author
González Gambau, Verónica
author
Oliva, Roger
author
Closa, Josep
author
Martín-Neira, Manuel
author
2019-06
The microwave imaging radiometer with aperture synthesis (MIRAS) is formed by 69 total power radiometers, of which three are the noise-injection type. Their calibration is reviewed on the basis of the data gathered during more than eight years of operation. Internally calibrated gain and offset corrections with improved temporal stability are presented. New front-end loss characterization with lower seasonal dependence originated from external temperature swings is also proposed. Finally, a methodology to validate the external calibrations, with the instrument pointing to the cold sky, is developed. It seems to indicate that the change of orientation of the instrument, with associated thermal variations, may induce small changes in the radiometer front-end losses, thus introducing calibration errors
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 12(6): 1633-1646 (2019)
http://hdl.handle.net/10261/188695
10.1109/JSTARS.2018.2885576
SMOS
L-band radiometry
Interferometric synthetic aperture radiometry
Radiometer calibration
Calibration of the MIRAS Radiometers