Nereida Rodriguez-Alvarez

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This paper presents a new technique to retrieve soil moisture using global navigation satellite signals reflected over the soil surface using the measurement of the power fluctuations of the signal created by the interference between the direct GPS signal and the one reflected over the soil surface. As a function of the elevation angle, power fluctuations(More)
This work summarizes the activities carried out by the SMOS (Soil Moisture and Ocean Salinity) Barcelona Expert Center (SMOS-BEC) team in conjunction with the CIALE/Universidad de Salamanca team, within the framework of the European Space Agency (ESA) CALIMAS project in preparation for the SMOS mission and during its first year of operation. Under these(More)
The increasing interest of the scientific community in soil moisture mapping at global scale, with which climate and hydrologic models could be improved, has lead to the proposal of ESA’s Soil Moisture and Ocean Salinity (SMOS) [1], and NASA’s Soil Moisture Active and Passive (SMAP) [2]. After launch, both missions will need an intensive Cal/Val of soil(More)
A new and efficient algorithm to compute delay– Doppler maps is presented. It improves by more than an order of magnitude the required computation time and memory resources. This approach is based on the derivation of explicit expressions of the space coordinates as a function of the delay offset and Doppler shift. Using this technique, the limitation posed(More)
The Soil Moisture and Ocean Salinity (SMOS) mission is an Earth Explorer Opportunity mission from the European Space Agency (ESA). Its goal is to produce global maps of soil moisture and ocean salinity using the Microwave Imaging Radiometer by Aperture Synthesis (MIRAS). The purpose of the Passive Advanced Unit Synthetic Aperture (PAU-SA) instrument is to(More)
GNSS-REFLECTOMETER N. Rodriguez-Alvarez, R. Acevo, A. Aguasca, A. Camps , M. Vall-llossera , X. BoschLluis, I. Ramos-Perez, E. Valencia, J. F. Marchan-Hernandez Remote Sensing Lab, Dept.Teoria del Senyal i Comunicacions, D3, Universitat Politècnica de Catalunya and IEEC CRAE/UPC, 08034 Barcelona, Spain. SMOS Barcelona Expert Centre. Pg. Marítim de la(More)
Sea surface salinity can be remotely measured by means of L-band microwave radiometry. However, the brightness temperature also depends on the sea surface temperature and on the sea state, which is probably today one of the driving factors in the salinity retrieval error budgets of the European Space Agency’s Soil Moisture and Ocean Salinity (SMOS) mission(More)