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SMOS and follow-on missions improved Level 1 performance

Total activity: 1
Type of activity
Competitive project
Acronym
SMOS-Imp
Funding entity
AGENCIA ESTATAL DE INVESTIGACION
Funding entity code
TEC2017-88850-R
Amount
99.220,00 €
Start date
2018-01-01
End date
2020-12-31
Keywords
Radiometría, SMOS, calibración, calibration, interferometry, interferometría, microondas, microwaves, radiometry, remote sensing, teledetección
Abstract
This project is to be undertaken in the framework of the SMOS mission, an Earth Explorer Opportunity mission (Living Planet Programme
by the European Space Agency). Since its launch in 2009, its unique payload, the MIRAS (Microwave Imaging Radiometer by Aperture
Synthesis) has produced a continuous stream of calibrated radiometric data to develop high level Ocean Salinity and Soil Moisture
products.
Now the mission is in operations phase and the MIRAS radiometer measuring in full polarisation mode, provides soil moisture and ocean
salinity information regularly to the SMOS Validation and Retrieval team and to the entire research community. Thanks to the excellent
technical status and the scientific results achieved, the mission has been extended by ESA to 2019 and beyond, pending a successful
review of its performance in 2018, to the end of ESAs 5th Earth Observation Envelope Programme.
The current proposal builds on the successful activities performed so far by the research team in the frame of the SMOS project and it is
aimed to address the mission current hot points. These can be summarized into two main general objectives: brightness temperature
spatial bias reduction and orbital and seasonal drift minimization. Two additional complementary objectives that have the potential of
technology transfer to the industry are also addressed: the study of SMOS new array configurations (low side lobe level) for future
missions and the up-grade of UPC SMOS data processor (MIRAS Testing Software).
This general objectives particularize to the following tasks:
1. SMOS enhanced full-pol radiometric performance
The main topic currently addressed regarding spatial bias is the mitigation of the Land Sea Contamination (LSC) by means of a Gibbs 2
image reconstruction technique, that reduces the floor error, and different techniques to assure that amplitude errors in the set of visibility
samples are consistent. A close interaction with the scientists is required to decouple residual instrumental errors from the errors caused
from mismodeling of the different contributions used to set the geophysical model.
2. Impact of antenna errors and array distortion on SMOS full-pol spatial bias
Preliminary results show that antenna pattern phase errors seem to be the main contributor to the LSC artifact. If the underlying
assumption is confirmed, is of outmost importance for the industry related to the design of the array for a SMOS follow-on mission.
3. SMOS enhanced stability and absolute accuracy
After recent calibration and image reconstruction improvements, SMOS radiometric performance is outstanding since both long term and
orbital stability are constrained within a few tenths of a Kelvin. However, there still is some margin for further improvement since
performance plots reveal a systematic error behaviour.
4. SMOS follow-on preparatory activities and other missions
As SMOS is getting more and more consolidated as a successful mission, several initiatives to set the path for future SMOS follow-on
missions with enhanced performance have taken place. These first attempts have been mainly addressed to analyze different array
configurations that can provide better spatial coverage and more robust performance.
5. MTS (MIRAS Testing Software) update
MTS has been periodically updated according to the SMOS mission needs and evolution and it will follow updating during this project.

Participants

Scientific and technological production

1 to 1 of 1 results
 
  • Calibration of the MIRAS Radiometers  Open access

     Corbella, I.; Torres, F.; Duffo, N.; Duran, I.; González-Gambau, V.; Oliva, R.; Closa, J.; Martín, M.
    IEEE journal of selected topics in applied earth observations and remote sensing
    DOI: 10.1109/JSTARS.2018.2885576
    Date of publication: 2018-12-21
    Journal article
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