Exploració per tema "Radiometria"
Ara es mostren els items 1-20 de 48
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Accurate geolocation of rfi sources in smos imagery based on superresolution algorithms
(2014)
Text en actes de congrés
Accés restringit per política de l'editorialAccurate geolocation of SMOS RFI sources is very important for effectively switching-off the illegal emitter in the protected L-band. We present a novel approach for the geolocation of SMOS RFI sources, based on the Direction ... -
Acquisition and processing software for an airborne soil moisture mapper LBand radiometer
(Universitat Politècnica de Catalunya, 2010-07-10)
Projecte/Treball Final de Carrera
Accés obertThe improvement in weather forecast and climate motorization, to prevent for example natural disasters, requires global scale knowledge of the soil moisture (SM) and the surface salinity (SSS), which are non-existent at ... -
Advanced architectures for real-time delay-doppler map GNSS-reflectometers: the GPS reflectometer instrument for PAU (griPAU)
(2010-07-15)
Article
Accés restringit per política de l'editorialIn recent years Global Navigation Satellite System’s signals Reflectometry (GNSS-R) has stood as a potential powerful remote sensing technique to derive scientifically relevant geophysical parameters such as ocean altimetry, ... -
Analisys of noise-injection networks for interferometric-radiometer calibration
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-04-30)
Article
Accés obertThe spatial resolution of current space-borne Earth observation radiometers is limited by the physical antenna aperture. This is especially critical at L-band, which exhibits high sensitivity to soil moisture and sea surface ... -
Analysis and mitigation of the reconstruction error in interferometric radiometry
(Universitat Politècnica de Catalunya, 2014-12-05)
Projecte/Treball Final de Carrera
Accés obert[ANGLÈS] The European Space Agency (ESA) Soil Moisture and Ocean Salinity mission (SMOS) provides continuous global maps of soil moisture and ocean surface salinity. Its payload MIRAS (Microwave Imaging Radiometer with ... -
Brightness-temperature retrival methods in synthetic aperture radiometers
(IEEE, 2009-01)
Article
Accés obertBightness-temperature retrieval techniques for synthetic aperture radiometers are reviewed. Three different approaches to combine measured visibility and antenna temperatures, along with instrument characterization ... -
Characterization of a 94 GHz radiometric imager with mechanical beam-scanning
(IEEE, 2011)
Text en actes de congrés
Accés restringit per política de l'editorialThis paper presents the characterization in terms of spatial resolution and radiometric sensitivity of a W-band Total Power Radiometer (TPR). The TPR is based on a heterodyne receiver with 64 dB of gain and 6.5 dB of noise ... -
Compensation of elevation angle variations in polarimetric brightness temperature measurements from airborne microwave radiometers
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-01-31)
Article
Accés obertThis paper presents a method for compensating the elevation angle fluctuations occurring in airborne radiometry due to aircraft roll and pitch. The correction is based on a radiative transfer model, and is demonstrated by ... -
Considerations About Antenna Pattern Measurements of 2-D Aperture Synthesis Radiometers
(IEEE, 2006-04-30)
Article
Accés obertAccurate measurement of the antenna voltage patterns of large-aperture synthesis radiometers is critical in order to achieve good radiometric accuracy, and a very time consuming and expensive task. Measurement requirements ... -
Contribution to the application of near ground L-band radiometry
(Universitat Politècnica de Catalunya, 2019-07-16)
Projecte Final de Màster Oficial
Accés obertARIEL is an L-band radiometer adapted from Earth Observation satellite technology for use in terrestrial, near to ground surveys of moisture. The key technical benefits are compact size, lightweight, mobility and high pixel ... -
Correction of spatial errors in SMOS brightness temperature images
(IEEE, 2011)
Text en actes de congrés
Accés restringit per política de l'editorialSystematic spatial errors in SMOS brightness temperature images are successfully estimated by using a statistical analysis of measured data. A constant multiplicative mask is derived by averaging spatial errors of a large ... -
Denormalization of visibilities for in-orbit calibration of interferometric radiometers
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-10-31)
Article
Accés obertThis paper reviews the relative calibration of an interferometric radiometer taking into account the experimental results of the first batch of receivers developed in the frame of the European Space Agency's Soil Moisture ... -
Denormalization of visibilities for in-orbit calibration of interferometric radiometers
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-10-31)
Article
Accés obertThis paper reviews the relative calibration of an interferometric radiometer taking into account the experimental results of the first batch of receivers developed in the frame of the European Space Agency's Soil Moisture ... -
Design and implementation of a RFI monitoring payload for the 5G 24 GHz bands for poketqubes
(Universitat Politècnica de Catalunya, 2022-07-05)
Treball Final de Grau
Accés restringit per acord de confidencialitatThe project developed in this thesis consists of creating a PocketQube payload in charge of monitoring the 24 to 25 GHz band to enforce that the emissions of the 5G communications band are within limit. In this thesis, the ... -
Efecto de la corrección de la eficiencia de correlación GKJ sobre datos SMOS en la recuperación de humedad
(Universitat Politècnica de Catalunya, 2016-10)
Projecte/Treball Final de Carrera
Accés obertAnalysis of the effects of the correction GKJ on SMOS data in the retrieval process of soil moisture -
Estudi de mapes Delay-Doppler sobre gel, terra i mar
(Universitat Politècnica de Catalunya, 2009-07-10)
Projecte/Treball Final de Carrera
Accés obertHi ha una gran quantitat d’estudis de caire geofísic [1] que determinen, des de fa molts anys, que un 70% de la superfície total del nostre planeta és aigua; és més, se sap que un 97% del total d’aquesta aigua és la ... -
Experimental estimation of soil emissivity and its application to soil moisture retrieval in the SMOS Mission
(Universitat Politècnica de Catalunya, 2009-09-07)
Tesi
Accés obertTot i que l'aigua retinguda pel sòl constitueix una petita fracció del volum total d'aigua que hi ha a la Terra, l'humitat del sòl juga un paper important als models climàtics i hídrics. La radiometria en banda L (1.400 a ... -
Experimental validation of radiometric sensitivity in correlation radiometers
(IEE-INST ELEC ENG, 1998-12-31)
Article
Accés obertThe prediction of the radiometric sensitivity of correlation radiometers based on the system parameters requires knowledge of the standard deviation of each measurement due to the finite integration time. Theoretical ... -
Exploiting the structure of MWR-derived temperature profile for stable boundary-layer height estimation
(International Society for Photo-Optical Instrumentation Engineers (SPIE), 2015)
Comunicació de congrés
Accés restringit per decisió de l'autorA method for the estimation of Stable Boundary Layer Height (SBLH) using curvature of the potential temperature profiles retrieved by a Microwave Radiometer (MWR) is presented. The vertical resolution of the MWR-derived ... -
Geolocalizing SMOS RFI sources on the densely populated East Asia
(2015)
Text en actes de congrés
Accés restringit per política de l'editorialIn the SMOS measurements, the negative effect of RadioFrequency Interference (RFI) is clearly present, deteriorating the Brightness Temperature (BT) images. RFI sources have to be monitored and accurately geolocated in ...