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IEEE Geoscience and Remote Sensing Letters 01/2012; 9:282-286. · 1.56 Impact Factor
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ABSTRACT: 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 study and test some potential improvements that could eventually be implemented in future missions using interferometric radiometers such as the Geoestacionary Atmosferic Sounder (GAS), the Precipitation and All-weather Temperature and Humidity (PATH) and the Geostationary Interferometric Microwave Sounder (GIMS). Both MIRAS and PAU-SA are Y-shaped arrays with uniformly distributed antennas, but the receiver topology and the processing unit are quite different. The purpose of this work is to identify the elements in the MIRAS's design susceptible of improvement and apply them in the PAU-SA instrument demonstrator, to test them in view of these future interferometric radiometer missions.
Sensors 01/2012; 12(6):7738-77. · 1.74 Impact Factor
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IEEE Geosci. Remote Sensing Lett. 01/2011; 8:715-719.
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IEEE Geoscience and Remote Sensing Letters 01/2011; 8:750-754. · 1.56 Impact Factor
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2011 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2011, Vancouver, BC, Canada, July 24-29, 2011; 01/2011
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2011 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2011, Vancouver, BC, Canada, July 24-29, 2011; 01/2011
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IEEE Transactions on Geoscience and Remote Sensing 01/2011; 49:3225-3235. · 2.89 Impact Factor
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2011 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2011, Vancouver, BC, Canada, July 24-29, 2011; 01/2011
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2011 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2011, Vancouver, BC, Canada, July 24-29, 2011; 01/2011
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2011 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2011, Vancouver, BC, Canada, July 24-29, 2011; 01/2011
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2011 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2011, Vancouver, BC, Canada, July 24-29, 2011; 01/2011
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Nereida Rodriguez-Alvarez, Adriano Camps,
Mercè Vall-Llossera,
Xavier Bosch-Lluis,
Alessandra Monerris,
Isaac Ramos-Perez,
Enric Valencia,
Juan Fernando Marchan-Hernandez,
José Martínez-Fernández,
Guido Baroncini-Turricchia,
Carlos Perez-Gutierrez,
Nilda Sánchez
IEEE Transactions on Geoscience and Remote Sensing 01/2011; 49:71-84. · 2.89 Impact Factor
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2011 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2011, Vancouver, BC, Canada, July 24-29, 2011; 01/2011
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Algorithms. 01/2011; 4:155-182.
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2011 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2011, Vancouver, BC, Canada, July 24-29, 2011; 01/2011
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IEEE T. Geoscience and Remote Sensing. 01/2011; 49:3156-3166.
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ABSTRACT: This study provides a general framework to analyze the effects on correlation radiometers of a generic quantization scheme and sampling process. It reviews, unifies and expands several previous works that focused on these effects separately. In addition, it provides a general theoretical background that allows analyzing any digitization scheme including any number of quantization levels, irregular quantization steps, gain compression, clipping, jitter and skew effects of the sampling period.
Sensors 01/2011; 11(6):6066-87. · 1.74 Impact Factor
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ABSTRACT: During the last years the importance of water management has grown
considerably. Average temperatures exhibit an increasing pattern (0.77
°C during the last 20 years) that is expected to continue in the
next years. These results in a decrease in the hydrical resources (15%
during the last 20 years for the Catalan territori) being the
expectative not very optimist. A tangible consequence was the drought
episode that suffers Catalonia. It is within this scenario that the
‘Programa Català d'Observació de la Terra' (PCOT) as
a unit of the official mapping agency of Catalonia, the ‘Institut
Cartogràfic de Catalunya' (ICC) has detected the need to develop
new tools to improve the management of water resources. The knowledge
of soil moisture across a given region can help to efficiently manage
the limited water resources. Present Earth Observations missions such as
ESA's SMOS, or the future NASA's SMAP focus considerably their efforts
in the estimation of soil moisture. The main drawbacks are the
resolutions obtained (40 km for SMOS, 10 km for SMAP), which are not
adequate for regional scale and territorial availability such as the
case of Catalonia where a spatial resolution in a range between 20-30m.
and 100-150m. is desired both for local actuations and to deteminate
hidric soil patterns In this scenario, PCOT is carrying out an
airborne soil moisture mission for the Catalan territory, taking
advantage of the availability of ICC aircrafts and of more than 20 years
of experience in making aircraft campaigns and operating hyperspectral
airborne sensors such as CASI (0.75-1.4 µm) and TASI (8-11.5
µm) to respond to environmental and cartographic end users needs
of geoinformation data, products and services. This mission will
generate soil moisture maps over the Catalan region that will improve
the water management, and will also be used for the study of the
hydrological patterns of Catalonia. Soil moisture determination will be
achieved by means of L-band radiometry, using a radiometer designed by
the Passive Remote Sensing Group of the ‘Universitat
Politècnica de Catalunya' (UPC). Spatial resolution enhancement
or vegetation cover and surface roughness compensation will be improved
by means of data fusion by using the operational CASI and TASI
instruments flight simultaneously. Thus, L-band radiometer measurements
will be combined with thermal and hyperspectral sensor measurements to
obtain surface temperature and vegetation indexes, and thus allow
improving the retrieval soil moisture. This airborne soil moisture
mission program is supported by a Torres Quevedo grant awarded by the
Spanish Ministry of Science and Innovation as well as by ICC/PCOT as one
of the Earth Observation Demostration Program on the Water Cycle area of
activity (named RADERO-Airborne Radiometry) . Running in parallel of
technical and operational identification of drivers, RADERO takes into
acount as a third paramount pillar, to guarantee the usefulness of
RADERO, the improvement of awareness and feedback with end users. RADERO
mission has set up an advisory board to check the mission analysis and
design, under the supervision of the Catalan Agriculture Department
among other scientific and potential end users.
04/2010; 12:7788.
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IEEE International Geoscience & Remote Sensing Symposium, IGARSS 2010, July 25-30, 2010, Honolulu, Hawaii, USA, Proceedings; 01/2010
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IEEE International Geoscience & Remote Sensing Symposium, IGARSS 2010, July 25-30, 2010, Honolulu, Hawaii, USA, Proceedings; 01/2010
