Graphic summary
  • Show / hide key
  • Information


Scientific and technological production
  •  

1 to 50 of 104 results
  • Access to the full text
    ARBRES: Light-weight CW/FM SAR sensors for small UAVs  Open access

     Aguasca Sole, Alberto; Acevo Herrera, René; Broquetas Ibars, Antoni; Mallorqui Franquet, Jordi Joan; Fabregas Canovas, Francisco Javier
    Sensors
    Date of publication: 2013-03-06
    Journal article

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    This paper describes a pair of compact CW/FM airborne SAR systems for small UAV-based operation (wingspan of 3.5 m) for low-cost testing of innovative SAR concepts. Two different SAR instruments, using the C and X bands, have been developed in the context of the ARBRES project, each of them achieving a payload weight below 5 Kg and a volume of 13.5 dm3 (sensor and controller). Every system has a dual receiving channel which allows operation in interferometric or polarimetric modes. Planar printed array antennas are used in both sensors for easy system integration and better isolation between transmitter and receiver subsystems. First experimental tests on board a 3.2 m wingspan commercial radio-controlled aircraft are presented. The SAR images of a field close to an urban area have been focused using a back-projection algorithm. Using the dual channel capability, a single pass interferogram and Digital Elevation Model (DEM) has been obtained which agrees with the scene topography. A simple Motion Compensation (MoCo) module, based on the information from an Inertial+GPS unit, has been included to compensate platform motion errors with respect to the nominal straight trajectory.

  • Phase quality optimisation techniques and limitations in polarimetric differential SAR interferometry

     Iglesias, Rubén; Monells Miralles, Daniel; Fabregas Canovas, Francisco Javier; Mallorqui Franquet, Jordi Joan; Aguasca Sole, Alberto; López Martínez, Carlos
    International Workshop on Science and Applications of SAR Polarimetry and Polarimetric Interferometry
    Presentation's date: 2013-01
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    In this paper, the application of polarimetric optimization techniques for Differential SAR Interferometry (DInSAR) applications is studied. The objective of the proposed techniques is to increase the number of temporal coherent scatterers, improving thus the robustness of the DInSAR algorithms exploiting the polarimetric capabilities of data. The relationship between optimum coherences or amplitude dispersion maps, depending on the pixels selection method used, and the final DInSAR results is analyzed, using both orbital and Ground-Based SAR fully-polarimetric data. Moreover, the main advantages and drawbacks of each optimization method will be analyzed, especially when polarimetric stability does not apply. With the optimization techniques presented up to a twofold increase of the pixel candidates in the coherence case and up to a factor of seven in the amplitude dispersion case may be reached.

  • Polarimetric temporal analysis of urban environments with a ground-based SAR

     Pipia, Luca; Fabregas Canovas, Francisco Javier; Aguasca Sole, Alberto; López Martínez, Carlos
    IEEE transactions on geoscience and remote sensing
    Date of publication: 2013-04
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Revisiting time constitutes a key constraint for continuous monitoring activities based on space- and airborne synthetic aperture radar (SAR) acquisitions. Conversely, the employment of terrestrial platforms overcomes this limitation and makes it possible to perform time-continuous observations of small space-scale phenomena. New research lines of SAR dealing with the backscattering evolution of different types of scenarios become hence possible through the analysis of ground-based SAR (gbSAR) data collections. The Remote Sensing Laboratory of the Universitat Politècnica de Catalunya drove a one-year measurements campaign in the village of Sallent, northeastern Spain, using its X-Band gbSAR sensor. The field experiment aimed at studying the subsidence phenomenon induced by the salt mining activity carried out in this area during the past decades. In this paper, the polarimetric behavior of an urban environment is investigated at different time scales. After a brief description of the test site and the measurement campaign, the analysis is focused on the stability on man-made structures at different time scales. PolSAR data monthly acquired from June 2006 to July 2007 are employed to stress the presence of nonstationary backscattering processes within the urban scene and the effect they have on differential phase information. Then, a filtering procedure aiming at reducing backscattering randomness in one-day and long-term data collections is then put forward. The improvements provided by the proposed technique are assessed using a new polarimetric descriptor, the time entropy. In the end, the importance of preserving the interferometric phase information from nonstationary backscattering contaminations using fully polarimetric data is discussed.

    Revisiting time constitutes a key constraint for continuous monitoring activities based on space- and airborne synthetic aperture radar (SAR) acquisitions. Conversely, the employment of terrestrial platforms overcomes this limitation and makes it possible to perform time-continuous observations of small space-scale phenomena. New research lines of SAR dealing with the backscattering evolution of different types of scenarios become hence possible through the analysis of ground-based SAR (gbSAR) data collections. The Remote Sensing Laboratory of the Universitat Politècnica de Catalunya drove a one-year measurements campaign in the village of Sallent, northeastern Spain, using its X-Band gbSAR sensor. The field experiment aimed at studying the subsidence phenomenon induced by the salt mining activity carried out in this area during the past decades. In this paper, the polarimetric behavior of an urban environment is investigated at different time scales. After a brief description of the test site and the measurement campaign, the analysis is focused on the stability on man-made structures at different time scales. PolSAR data monthly acquired from June 2006 to July 2007 are employed to stress the presence of nonstationary backscattering processes within the urban scene and the effect they have on differential phase information. Then, a filtering procedure aiming at reducing backscattering randomness in one-day and long-term data collections is then put forward. The improvements provided by the proposed technique are assessed using a new polarimetric descriptor, the time entropy. In the end, the importance of preserving the interferometric phase information from nonstationary backscattering contaminations using fully polarimetric data is discussed

  • Millimeter-Wave and Terahertz Imaging Techniques  Open access

     Nova Lavado, Enrique
    Defense's date: 2013-07-22
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    This thesis presents the development and assessment of imaging techniques in the millimeterwave (mmW) and terahertz frequency bands. In the first part of the thesis, the development of a 94 GHz passive screener based on a total-power radiometer (TPR) with mechanical beamscanning is presented. Several images have been acquired with the TPR screener demonstrator, either in indoor and outdoor environments, serving as a testbed to acquire the know-how required to perform the research presented in the following parts of the thesis. In the second part of the thesis, a theoretical research on the performance of near-field passive screeners is described. This part stands out the tradeoff between spatial and radiometric resolutions taking into account the image distortion produced by placing the scenario in the near-field range of the radiometer array. In addition, the impact of the decorrelation effect in the image has been also studied simulating the reconstruction technique of a synthetic aperture radiometer. Guidelines to choose the proper radiometer depending on the application, the scenario, the acquisition speed and the tolerated image distortion are given in this part. In the third part of the thesis, the development of a correlation technique with optical processing applicable to millimeter-wave interferometric radiometers is described. The technique is capable of correlating wide-bandwidth signals in the optical domain with no loss of radiometric sensitivity. The theoretical development of the method as well as measurements validating the suitability to correlate radiometric signals are presented in this part. In the final part of the thesis, the frequency band of the imaging problem is increased to frequencies beyond 100 GHz, covering the THz band. In this case the research is centered in tomographic techniques that include spectral information of the samples in the reconstructed images. The tomographic algorithm can provide detection and identification of chemical compounds that present a certain spectral footprint in the THz frequency band.

  • Advanced polarimetric optimization for DInSAR applications with Ground-Based SAR

     Iglesias, Rubén; Fabregas Canovas, Francisco Javier; Aguasca Sole, Alberto; López Martínez, Carlos; Alonso Gonzalez, Alberto
    European Conference on Synthetic Aperture Radar
    Presentation's date: 2012-04
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    In this paper, the applications of advanced polarimetric optimization techniques for Differential Interferometric SAR (DInSAR) pixel selection are explored in the framework of deformation map retrieval in landslides. Unfortunately, most of high mountain landslides occur on vegetated areas with a poor density of coherent scatterers that with a fast decorrelation at X-band. The objective of the techniques proposed in this paper is to increase the number of pixels with good quality, and thus the robustness of DInSAR algorithms, by exploiting the larger density of coherent scatterers present in polarimetric SAR data. Using Ground-Based SAR zero-baseline fullypolarimetric data sets, the relationship between optimum coherences and its corresponding phase in terms of DInSAR application is carefully analyzed. In the paper, different coherence optimization methods available in the literature are studied. The main advantages and drawbacks of the different approaches are drawn.

  • Application of high resolution spotlight TerraSAR-X data to landslide monitoring

     Iglesias, Rubén; Monells Miralles, Daniel; Centolanza, Giuseppe; Mallorqui Franquet, Jordi Joan; Fabregas Canovas, Francisco Javier; Aguasca Sole, Alberto; López Martínez, Carlos
    European Conference on Synthetic Aperture Radar
    Presentation's date: 2012-04
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper seeks to demonstrate that radar-based remote sensing techniques, especially those based on orbital sensors, can be as effective as the conventional geotechnical and discrete GPS measurement ones for the detection and monitoring of well suited landslides. Unfortunately, deformation can only be retrieved for those landslides presenting a good orientation with respect the satellite orbit. In addition, many of the high mountain landslides are vegetated areas that decorrelate faster at X-band. As in these scenarios the number of persistent scatterers can be low and, at the same time, the area of interest is usually small, the processing can be benefited of the usage of high-resolution data that will maximize the chances of detecting persistent scatters coming from both natural targets and man-made structures. The high resolution Spotlight mode of TerraSAR-X is thus the perfect choice as it offers a fine resolution. In addition, its 11 days of revisit time and X-band carrier allows the monitoring of small variations in the landslide trend and deal with its variable dynamics. The landslide of study is ‘El Forn de Canillo’ (Andorra) where the deformation results will be compared and validated with those obtained with the deployed UPC’s Ground-Based (GB-SAR) X-band sensor.

  • Landslide monitoring with spotlight TerraSAR-X DATA

     Iglesias González, Rubén; Monells Miralles, Daniel; Centolanza, Giuseppe; Mallorqui Franquet, Jordi Joan; Fabregas Canovas, Francisco Javier; Aguasca Sole, Alberto
    IEEE International Geoscience and Remote Sensing Symposium
    Presentation's date: 2012-07
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper aims to demonstrate that radar-based remote sensing techniques can be as effective as the conventional geotechnical ones for the detection and monitoring of well suited areas. Many of the high mountain landslides are vegetated areas that decorrelate faster at X-band. As in these scenarios the number of coherent scatterers is low and, in addition, the area of interest is usually small, the processing can be benefited of the usage of high-resolution data. This will maximize the chances of detecting persistent scatters coming from both natural targets and man-made structures. The high resolution Spotlight mode of TerraSAR-X is thus the perfect choice as it offers a fine resolution. On the other hand, its 11 days of revisit time and X-band carrier allows the monitoring of small variations in the landslide trend and deal with its variable dynamics.

  • A new approach for atmospheric phase screen compensation in ground-based SAR over areas with steep topography

     Fabregas Canovas, Francisco Javier; Iglesias, Rubén; Aguasca Sole, Alberto
    European Conference on Synthetic Aperture Radar
    Presentation's date: 2012-04
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Polarimetric optimization for DInSAR pixel selection with ground-based SAR

     Iglesias, Rubén; Fabregas Canovas, Francisco Javier; Aguasca Sole, Alberto; López Martínez, Carlos; Alonso Gonzalez, Alberto; Mallorqui Franquet, Jordi Joan
    IEEE International Geoscience and Remote Sensing Symposium
    Presentation's date: 2012-07
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Review of the CALIMAS Team Contributions to European Space Agency¿s Soil Moisture and Ocean Salinity Mission Calibration and Validation

     Camps Carmona, Adriano Jose; Font Ferré, Jordi; Corbella Sanahuja, Ignasi; Vall-llossera Ferran, Mercedes Magdalena; Portabella, Marcos; BALLABRERA POY, JOAQUIM; Gonzalez Gambau, Verónica; Piles Guillem, Maria; Aguasca Sole, Alberto; Acevo Herrera, René; Gabarro Prats, Carolina; Duffo Ubeda, Nuria; Bosch, Xavier; Fernández Gallego, Pedro; Gourrion, J.; Guimbard, Sébastien Arnaud; Marín, Anna; Martínez, Justino; Monerris Belda, Alessandra; Pérez, Baptiste; Pérez Villar, Fernando; Salvador, Joaquin; Sabia, Roberto; Talone, Marco; Torres Torres, Francisco; Pablos, Miriam; Martínez-Fernández, José; ANTONIO, TURIEL MARTÍNEZ; Valencia Domenech, Enric; Rodríguez Álvarez, Nereida; Sanchez, Nilda; Pérez Gutiérrez, Carlos; Baroncini Turricchia, Guido; Rius, Antonio; Ribó Vedrilla, Serni
    Remote sensing of environment
    Date of publication: 2012
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Snow thickness monitoring using GNSS measurements

     Rodríguez Álvarez, Nereida; Aguasca Sole, Alberto; Valencia Domenech, Enric; Bosch Lluis, Xavier; Camps Carmona, Adriano Jose; Ramos Perez, Isaac; Park, Hyuk; Vall-llossera Ferran, Mercedes Magdalena
    IEEE Geoscience and Remote Sensing Letters
    Date of publication: 2012
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • SAR Multidimensional para la observación de la tierra: sistemas, procesado y aplicaciones

     Alonso Gonzalez, Alberto; Centolanza, Giuseppe; Monells Miralles, Daniel; López Martínez, Carlos; Mallorqui Franquet, Jordi Joan; Broquetas Ibars, Antoni; Fabregas Canovas, Francisco Javier; Makhoul Varona, Eduardo; Aguasca Sole, Alberto
    Participation in a competitive project

     Share

  • Micrometric deformation imaging at W-Band

     Abril, Jordi; Nova, Enrique; Broquetas Ibars, Antoni; Aguasca Sole, Alberto; Romeu Robert, Jordi; Jofre Roca, Luis
    IEEE International Microwave Workshop
    Presentation's date: 2011-08-24
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The measurement of scattered signals at W Band can be exploited to form images of small deformations with precisions in the order of tenths of micrometers. In this paper an Interferometric Synthetic Aperture Radar setup is proposed to form high resolution reflectivity images and deformation maps of dielectric or metallic surfaces. First, the system geometry of observation based on a linear motion of the radar antennas is described. A CW frequency domain measurement provides the wide band required for high resolution imaging. The scattered field data is focused on the surface spatial domain using a combination of range compression based on Inverse Fourier Transform combined with a backprojection algorithm to form the synthetic aperture with a high cross range resolution. The focusing performance has been assessed by numerical simulations and experimental measurements of simple scattering objects like spheres and trihedrals. Interferometric images of controlled displacements have been obtained showing a good agreement between real and measured displacements. A representative surface deformation test has been also carried out using a metallic rough surface. The interferometric phase difference between acquisitions can be used to image local deformations in the order of tens of micrometers from a range of several meters. Likewise the interferogram coherence shows the degree of decorrelation of the radar reflectivity which provides valuable information for surface random change assessment.

  • Snow monitoring using GNSS-R techniques

     Rodriguez Alvarez, Nereida; Aguasca Sole, Alberto; Valencia Domenech, Enric; Bosch Lluis, Xavier; Ramos Perez, Isaac; Park, Hyuk; Camps Carmona, Adriano Jose; Vall-llossera Ferran, Mercedes Magdalena
    IEEE International Geoscience and Remote Sensing Symposium
    Presentation's date: 2011-07-25
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    GNSS-R techniques are currently being studied to remotely sense a number of geophysical parameters over different types of surfaces [1-6]. The Interference Pattern Technique (IPT) is based on the measurement of the interference pattern of the GPS direct and reflected signals, after reflecting over the surface, as the GPS satellites move. This paper extends previous studies [7-11], in which water level was monitored [7] and land areas were observed retrieving soil moisture, topography and vegetation height for different kinds of crops (wheat, barley and maize) [8-10], to a snowcovered soils studies.

    GNSS-R techniques are currently being studied to remotely sense a number of geophysical parameters over different types of surfaces [1-6]. The Interference Pattern Technique (IPT) is based on the measurement of the interference pattern of the GPS direct and reflected signals, after reflecting over the surface, as the GPS satellites move. This paper extends previous studies [7-11], in which water level was monitored [7] and land areas were observed retrieving soil moisture, topography and vegetation height for different kinds of crops (wheat, barley and maize) [8-10], to a snow- covered soils studies.

  • Deforming and relief interferometric SAR imaging at W-band

     Abril, Jordi; Nova, Enrique; Broquetas Ibars, Antoni; Aguasca Sole, Alberto; Romeu Robert, Jordi; Jofre Roca, Luis
    International Conference on Infrared, Millimeter, and Terahertz Waves
    Presentation's date: 2011-10-02
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Interferometry at W Band can be exploited to form images of small deformations with precisions in the order of tenths of microns and retrieve surface relieves. An Interferometric Synthetic Aperture Radar setup is proposed in which the scattered field is focused using a combination of range compression and backpropagation algorithm. Interferometric images involving micrometric displacements have been obtained showing a good agreement between real and measured displacements. A metallic rough surface deformation test has been first performed, by imaging the phase difference between acquisitions before and after the displacement. The interferometric phase difference between acquisitions can be used to image local deformations from a range of several meters. Furthermore the interferogram coherence shows the degree of decorrelation of the radar reflectivity which provides valuable information for surface random change. Likewise the relief of the surface with an L-shape target is retrieved mapping the phase difference between the two receiving antennas, in this case an static scenario is required.

  • 2D atmospheric artifact compensation with multiple regression model in ground-based sar over mountainous areas

     Fabregas Canovas, Francisco Javier; Iglesias González, Rubén; Aguasca Sole, Alberto; Gili Ripoll, Jose Antonio
    Advances in the Science and Applications of SAR Interferometry
    Presentation's date: 2011-09-20
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Transpolarizing trihedral corner reflector characterization using a GB-SAR system

     Ferrer, Pere J.; López Martínez, Carlos; Aguasca Sole, Alberto; Pipia, Luca; González Arbesú, José María; Fabregas Canovas, Francisco Javier; Romeu Robert, Jordi
    IEEE Geoscience and Remote Sensing Letters
    Date of publication: 2011-07
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    The use of a low-profile, lightweight, and easy-to-fabricate transpolarizing surface placed on one side of a trihedral corner reflector (TCR) as a polarimetric calibrator is presented in this letter. The transpolarizing TCR presents a high backscattered cross-polar response contrary to standard TCRs. The performance of this device has been tested at the X-band using the Universitat Politecnica de Catalunya ground-based synthetic aperture radar.

  • Review of crop growth and soil moisture monitoring from a ground-based instrument implementing the Interference Pattern GNSS-R Technique

     Rodriguez Alvarez, Nereida; Bosch Lluis, Xavier; Camps Carmona, Adriano Jose; Aguasca Sole, Alberto; Vall-llossera Ferran, Mercedes Magdalena; Valencia Domenech, Enric; Ramos Perez, Isaac; Park, Hyuk
    Radio science
    Date of publication: 2011-10-15
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Sistemas de teledetección activos y pasivos embarcados en sistemas aéreos no tripulados para la monitorización de la tierra  Open access

     Acevo Herrera, René
    Defense's date: 2011-04-04
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    La comunidad científica ha mostrado gran interés por estudiar los fenómenos que ocurren sobre la superficie de la tierra, específicamente los que suceden en la atmósfera, los océanos, o la superficie del suelo, y que afectan el clima o modifican la superficie de la tierra. Para poder analizar y predecir estos fenómenos, se monitorizan parámetros que se relacionan de manera directa o indirecta con procesos biofísicos y geofísicos. Es en este punto donde la teledetección entra en juego, puesto que es la técnica que permite medir tales parámetros de forma remota sin necesidad de entrar en contacto directo con un objeto o una superficie. En particular, la teledetección por microondas permite la detección de energía electromagnética casi bajo cualquier condición climática y a cualquier hora del día, debido a que a esta longitud de onda la energía electromagnética puede penetrar a través de las nubes, polvo, neblina y lluvia, y es menos susceptible a la dispersión atmosférica, que afecta en gran medida a las señales ópticas. Actualmente existen varios sistemas de teledetección por microondas que se han embarcado en satélites, para monitorizar parámetros biofísicos y geofísicos sobre la superficie de la tierra de manera global. También se han desarrollado estos sistemas para ser transportados en plataformas aéreas tripuladas para realizar estudios a nivel local o regional, donde se desea obtener información de una zona en particular en tiempos relativamente cortos. Sin embargo, ambas plataformas representan, entre otras cosas, un alto coste, no solo económico sino de infraestructura, equipo, grupos de trabajo, permisos de operación, y varios requerimientos más. El creciente desarrollo de los sistemas aéreos no tripulados (Unmanned Aerial Vehicle, UAV), ha hecho posible su uso para transportar sensores de teledetección. Los sistemas UAV presentan las mismas ventajas que los sistemas aéreos tripulados, pero además añaden otras ventajas adicionales. Por ejemplo, pueden ser operados durante varias horas de forma autónoma, el coste de explotación y desarrollo puede ser menor que el de un avión tripulado si se emplea un UAV de bajas prestaciones. Por tal motivo en este trabajo se propone el uso de un aeromodelo de control por radio como plataforma UAV para monitorizar diversos parámetros geofísicos y biofísicos de la tierra mediante sensores activos y pasivos de teledetección por microondas. Para realizar las medidas de teledetección pasiva se ha desarrollado el sensor denominado Airborne RadIometEr at L-Band (ARIEL) que es un radiómetro Dicke de bajo peso y pequeñas dimensiones, y que trabaja en Banda L (≈1.4 GHz). En la presenta memoria se muestra el diseño del sensor, las características principales de funcionamiento, y las técnicas de procesamiento de datos. Posteriormente se presentan las campañas de medida realizadas en zonas de cultivo, suelo descubierto, y zonas costeras. En tales campañas se han conseguido generar mapas de temperatura de brillo y de humedad de suelo. Con el fin de llevar a cabo medidas de teledetección activa se ha desarrollado el sistema denominado AiR Based REmote Sensing ARBRES, que consta de dos sensores radar de apertura sintética SAR diseñados a dos frecuencias diferentes, uno en Banda C (≈ 5.3 GHz) y otro en Banda X (≈ 9.65 GHz). Ambos radares son de onda continua FMCW, además son de bajo peso, bajo consumo de potencia y de pequeñas dimensiones. Ambos sensores tienen la capacidad de realizar medidas de interferometría SAR. En esta memoria se muestran las características de funcionamiento del sistema, así como algunos algoritmos de focalización de imágenes SAR, y una técnica para compensar los movimientos de la plataforma de vuelo. Finalmente se presentan medidas en campo para obtener imágenes de reflectividad de un escenario, y se muestran también los resultados para medidas realizadas en configuración de interferometría de simple pasada, la cual está relacionada con la topografía del terreno.

  • Research & Development of a Simulator for Moving Target Indicator System

     Makhoul Varona, Eduardo; Rius Casals, Juan-manuel; Aguasca Sole, Alberto; O'callaghan Castella, Juan Manuel; Broquetas Ibars, Antoni
    Participation in a competitive project

     Share

  • Bistatic SAR based on Terrasar-X and ground based receivers

     Broquetas Ibars, Antoni; Fortes Galera, Eduardo M.; Siddique, M. A.; Duque, Sergi; Merlano Duncan, Juan Carlos; Lopez Dekker, Paco; Mallorqui Franquet, Jordi Joan; Aguasca Sole, Alberto
    IEEE International Geoscience and Remote Sensing Symposium
    Presentation's date: 2010-07-26
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    Study of maize plants effects in the retrieval of soil moisture using the interefence Ppttern GNSS-R technique  Open access

     Rodriguez Alvarez, Nereida; Bosch Lluis, Xavier; Acevo Herrera, René; Aguasca Sole, Alberto; Camps Carmona, Adriano Jose; Vall-llossera Ferran, Mercedes Magdalena; Ramos Perez, Isaac; Valencia Domenech, Enric
    IEEE International Geoscience and Remote Sensing Symposium
    Presentation's date: 2010-07-30
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    The use of Global Navigation Satellite Signals Reflections (GNSS-R) techniques to retrieve geophysical parameters from surfaces has been increased in the recent years. These techniques have resulted in suitable tools to obtain information about the sea state of oceans, which is very useful to improve the ocean salinity retrieval, and also, information about the soil moisture of lands. The present work focuses on the use of the Interference Pattern Technique (IPT), a particular type of GNSS-R technique, to study vegetation-covered soils. The IPT consists mainly of the measurement of the interference pattern between the GPS direct and reflected signals (the interference power), after they impinge over the ensemble soil surface and vegetation layer. The measured interference signal provides information on the soil moisture of the surface and also, on the vegetation height.

  • SABRINA-X: Bistatic SAR receiver for TerraSAR-X

     Broquetas Ibars, Antoni; Mallorqui Franquet, Jordi Joan; Aguasca Sole, Alberto; Merlano Duncan, Juan Carlos; Duque, Sergi
    European Conference on Synthetic Aperture Radar
    Presentation's date: 2010-06-09
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    Small UAV radiocommunication channel characterization  Open access

     Romeu Robert, Jordi; Aguasca Sole, Alberto; Alonso Valdesueiro, Javier; Blanch Boris, Sebastian; Martins, Ricardo
    European Conference on Antennas and Propagation
    Presentation's date: 2010-04-12
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Small Unmanned Aerial Vehicles (UAV) are finding different applications as platforms to carry observation payloads. The need to establish reliable high data rate channels requires to characterize the radiocommunication channel between the UAV and the ground station. In this communication an experimental set-up and some results for the characterization of a radio channel at 5.8 GHz are presented.

  • Access to the full text
    Altimetry study performed using an airborne GNSS-reflectometer  Open access

     Rodriguez Alvarez, Nereida; Acevo Herrera, René; Aguasca Sole, Alberto; Valencia Domenech, Enric; Camps Carmona, Adriano Jose; Vall-llossera Ferran, Mercedes Magdalena; Bosch Lluis, Xavier; Ramos Perez, Isaac
    IEEE International Geoscience and Remote Sensing Symposium
    Presentation's date: 2010-07-30
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    The Global Navigation Satellite Signals Reflections (GNSSR)techniques have been widely used for remote sensing purposes retrieving geophysical parameters over different types of surfaces. Over the ocean, altimetry or sea state can be retrieved. Over land, soil moisture can be inferred and over ice, altimetry, and ice age are also retrieved. This paper presents the results of using GNSS-R techniques to retrieve altimetry from the measurements of an airborne GNSS-Reflectometer.

  • Access to the full text
    Optimum design of a scavenging antenna system  Open access

     Serrano, Raquel; Aguasca Sole, Alberto; Romeu Robert, Jordi; Jofre Roca, Luis
    European Conference on Antennas and Propagation
    Presentation's date: 2010-04-12
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    This paper presents some guidelines for the design procedure of an optimum scavenging antenna system. Based on these guidelines, a scavenging antenna has been fabricated and characterized, achieving very good results in comparison to the traditional designs.

  • Integración de antenas en sensores autónomos para la gestión del espacio urbano

     Aguasca Sole, Alberto; Blanch Boris, Sebastian; Jofre Roca, Luis; Romeu Robert, Jordi
    Participation in a competitive project

     Share

  • Access to the full text
    Design and first results of an UAV-borne L-band radiometer for multiple monitoring purposes  Open access

     Acevo Herrera, René; Aguasca Sole, Alberto; Bosch Lluis, Xavier; Camps Carmona, Adriano Jose; Martínez-Fernández, José; Sánchez-Martín, Nilda; Pérez-Gutiérrez, Carlos
    Remote Sensing
    Date of publication: 2010-06-29
    Journal article

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    UAV (unmanned Aerial Vehicle) platforms represent a challenging opportunity for the deployment of a number of remote sensors. These vehicles are a cost-effective option in front of manned aerial vehicles (planes and helicopters), are easy to deploy due to the short runways needed, and they allow users to meet the critical requirements of the spatial and temporal resolutions imposed by the instruments. L-band radiometers are an interesting option for obtaining soil moisture maps over local areas with relatively high spatial resolution for precision agriculture, coastal monitoring, estimation of the risk of fires, flood prevention, etc. This paper presents the design of a light-weight, airborne L-band radiometer for deployment in a small UAV, including the hardware and specific software developed for calibration, geo-referencing, and soil moisture retrieval. First results and soil moisture retrievals from different field experiments are presented.

  • Access to the full text
    Polarimetric coherence optimization for interferometric differential applications  Open access

     Pipia, Luca; Fabregas Canovas, Francisco Javier; Aguasca Sole, Alberto; López Martínez, Carlos; Mallorqui Franquet, Jordi Joan
    IEEE International Geoscience and Remote Sensing Symposium
    Presentation's date: 2009-07
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    In this paper, the potentials of polarimetric coherenceoptimization techniques for differential interferometric SAR (DInSAR) applications are examined. For this purpose, the cutting-edge approaches available in the literature are considered. First, synthetic PolSAR data simulating homogeneous distributed scatterers are employed to demonstrate the convergence of the optimized differential phase to the deformation phase information. Then, real X-band ground-based PolSAR acquisitions concerning an urban environment are analyzed. The relation between optimum coherences and corresponding optimum phase in terms of deformation on retrieval is carefully analyzed using two zero-baseline fullypolarimetric data sets. In the end, general conclusions about the advantages and drawbacks of the alternative maximization approaches are drawn.

  • Transpolarizing trihedral measurement using UPC X-band GB-SAR

     Ferrer González, Pere J.; Romeu Robert, Jordi; González Arbesú, José María; Aguasca Sole, Alberto; López Martínez, Carlos; Pipia, Luca; Fabregas Canovas, Francisco Javier
    IEEE International Geoscience and Remote Sensing Symposium
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • High-compacted FM-CW SAR for boarding on small UAVs

     Acevo Herrera, René; Aguasca Sole, Alberto; Mallorqui Franquet, Jordi Joan; Fabregas Canovas, Francisco Javier
    IEEE International Geoscience and Remote Sensing Symposium
    Presentation's date: 2009-07
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    Multiport multiband coupling minimization for miniature antennas  Open access

     Serrano, Raquel; Capdevila Cascante, Santiago; Aguasca Sole, Alberto; Romeu Robert, Jordi; Jofre Roca, Luis
    European Conference on Antennas and Propagation
    Presentation's date: 2009
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    The equations governing the multiport multiband antennas are analyzed in this paper with the objective of drawing the design guidelines for low coupling small antennas. Those guidelines have been applied in the design and optimization of a dual band two-port small antenna of size around λ0/13 x λ0/13. The antenna geometry is shown together with coupling minimization results.

  • New Passive Instruments Developed for Ocean Monitoring at the Remote Sensing Lab¿Universitat Politècnica de Catalunya

     Camps Carmona, Adriano Jose; Bosch Lluis, Xavier; Ramos Perez, Isaac; Marchan Hernandez, Juan Fernando; Rodriguez Alvarez, Nereida; Valencia Domenech, Enric; Tarongí Bauzá, José Miguel; Aguasca Sole, Alberto; Acevo Herrera, René
    Sensors
    Date of publication: 2009-12
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Multiport Multiband Decoupling Optimization for Miniature Antennas

     Serrano Calvo, Raquel; Capdevila Cascante, Santiago; Aguasca Sole, Alberto; Romeu Robert, Jordi; Jofre Roca, Luis
    Radioengineering
    Date of publication: 2009-12
    Journal article

     Share Reference managers Reference managers Open in new window

  • LIVING WITH LANDSLIDE RISK IN EUROPE:ASSESSMENT, EFFECTS OF GLOBAL CHANGE AND RISK MANAGEMENT STRATEGIES

     Romero Morales, Enrique Edgar; Pinyol Puigmarti, Nuria Merce; Baeza Adell, Cristina; Mallorqui Franquet, Jordi Joan; Aguasca Sole, Alberto; Moya Sanchez, Jose; Lantada Zarzosa, Nieves; Lloret Morancho, Antonio; Ledesma Villalba, Alberto; Gili Ripoll, Jose Antonio; Alonso Pérez de Agreda, Eduardo; Fabregas Canovas, Francisco Javier; Olivella Pastalle, Sebastian; Hürlimann Ziegler, Marcel; Corominas Dulcet, Jordi
    Participation in a competitive project

     Share

  • CONCEPTOS AVANZADOS EN TELEDETECCION ACTIVA Y PASIVA DE MICROONDAS: TECNOLOGIA Y APLICACIONES

     Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Broquetas Ibars, Antoni; Mallorqui Franquet, Jordi Joan; Duffo Ubeda, Nuria; Aguasca Sole, Alberto; López Martínez, Carlos; Fabregas Canovas, Francisco Javier
    Participation in a competitive project

     Share

  • Access to the full text
    RFID based probes for EM-field measurements  Open access

     Capdevila Cascante, Santiago; Massud, Muhammad; Serrano, Raquel; Aguasca Sole, Alberto; Blanch Boris, Sebastian; Romeu Robert, Jordi; Bolomey, Jean Charles; Jofre Roca, Luis
    European Conference on Antennas and Propagation
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    In this paper the use of RFID for EM field measurement is studied. A novel RFID antenna with high tuning capabilities is presented and measured, and it is used in combination with several RFID IC to measure the EM field along the H-plane of a horn antenna. A calibration procedure for the non-linear effects in RFID IC is introduced and used to correct the measured fields.

  • Polarimetric differential SAR interferometry: first results with ground-based measurements

     Pipia, L; Fabregas Canovas, Francisco Javier; Aguasca Sole, Alberto; Lopez-Martinez, C; Duque Biarge, Sergio; Mallorqui Franquet, Jordi Joan
    IEEE Geoscience and Remote Sensing Letters
    Date of publication: 2009-01
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Atmospheric artifact compensation in ground-based DInSAR applications

     Pipia, L; Fabregas Canovas, Francisco Javier; Aguasca Sole, Alberto; López Martínez, Carlos
    IEEE Geoscience and Remote Sensing Letters
    Date of publication: 2008-01
    Journal article

     Share Reference managers Reference managers Open in new window

  • Determination of the sea surface emissivity at L-band and application to SMOS salinity retrieval algorithms: Review of the contributions of the UPC-ICM

     Camps Carmona, Adriano Jose; Font, J; Vall-llossera Ferran, Mercedes Magdalena; Corbella Sanahuja, Ignasi; Duffo Ubeda, Nuria; Torres Torres, Francisco; Blanch Boris, Sebastian; Aguasca Sole, Alberto; Villarino, R; Gabarro, C; Enrique, L; Miranda, J; Sabia, Roberto
    Radio science
    Date of publication: 2008-06-20
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Scattering Analysis of Urban Targets with Simulated SAR Imagery

     Margarit, G; Mallorqui Franquet, Jordi Joan; Lopez-Martinez, C; López Martínez, Carlos; Aguasca Sole, Alberto; Pipia, L; Fabregas Canovas, Francisco Javier
    European Conference on Synthetic Aperture Radar
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Polarimetric Deformation Maps Retrieval of Urban Areas using Ground-Based SAR Acquisitions

     Pipia, L; Fabregas Canovas, Francisco Javier; Aguasca Sole, Alberto; Duque, S; Mallorqui Franquet, Jordi Joan; Lopez-Martinez, C; López Martínez, Carlos
    IEEE International Geoscience & Remote Sensing Symposium
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Polarimetric temporal stability of urban GB-SAR measurements

     Pipia, L; Fabregas Canovas, Francisco Javier; López Martínez, Carlos; Aguasca Sole, Alberto; Mallorqui Franquet, Jordi Joan
    European Conference on Synthetic Aperture Radar
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • RFID-based Flexible Low Cost EM Field Probe

     Capdevila, S; Serrano, R; Aguasca Sole, Alberto; Blanch Boris, Sebastian; Romeu Robert, Jordi; Jofre Roca, Luis
    2008 IEEE AP-S International Symposium
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Initial Results of an Airborne Light-Weight L-Band Radiometer

     Valencia, E; Acevo Herrera, René; Aguasca Sole, Alberto; Bosch Lluis, Xavier; Rodríguez-Álvarez, N; Ramos Pérez, Isaac; Marchan Hernandez, Juan Fernando; Glenat, M; Bou, F; Camps Carmona, Adriano Jose
    IEEE International Geoscience & Remote Sensing Symposium
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Polarimetric Temporal Information for Urban Deformation Map Retrieval

     Pipia, Luca; Fabregas Canovas, Francisco Javier; Aguasca Sole, Alberto; Lopez-Martinez, Carlos; López Martínez, Carlos; Mallorqui Franquet, Jordi Joan; Oscar, Mora
    IEEE international Geoscience and Remote Sensing Symposium
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Active balanced feeding for compact wideband antennas

     Serrano, R; Aguasca Sole, Alberto; Romeu Robert, Jordi; Blanch Boris, Sebastian; Jofre Roca, Luis
    IEEE International Antennas and Propagation Symposium
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • PAU One-Receiver Ground-based and Airborne Instruments

     Camps Carmona, Adriano Jose; Aguasca Sole, Alberto; Bosch Lluis, Xavier; Marchan Hernandez, Juan Fernando; Ramos Perez, Isaac; Rodriguez Alvarez, Nereida; Bou, F; Ibáñez, Carles; Banqué, X; Prehn, R
    IEEE international Geoscience and Remote Sensing Symposium
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Transpolarizing Surfaces for Polarimetric SAR

     Ferrer, J P; López Martínez, Carlos; Fabregas Canovas, Francisco Javier; González Arbesú, José María; Romeu Robert, Jordi; Aguasca Sole, Alberto; Craeye, C
    IEEE international Geoscience and Remote Sensing Symposium
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • A Subsidence Monitoring Project using a Polarimetric GB-SAR Sensor

     Pipia, Luca; Fabregas Canovas, Francisco Javier; Aguasca Sole, Alberto; López Martínez, Carlos; López-Martínez, Carlos; Mallorqui Franquet, Jordi Joan; Oscar, Mora
    POLINSAR 2007
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window