Exploració per tema "Radar"

Ara es mostren els items 166-185 de 322

    • Fast algorithms for radar cross section computation of complex objects 

      Rius Casals, Juan Manuel; Vall-Llossera Ferran, Mercedes Magdalena; Ferrando, M. (Centre national d'études des télécommunications (CNET), 1990)
      Text en actes de congrés
      Accés obert
      Radar cross section (RCS) of complex targets can be obtained in real time using the hardware capabilities of a high performance graphic workstation. Target geometry is modelled by a computer-aided design package. First ...

    • Fast shadowing computation in physical optics surface 

      Rius Casals, Juan Manuel; Carbo, Alex; Úbeda Farré, Eduard; Heldring, Alexander (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      GRECO code has been updated by replacing the graphical processing technique for computation of Physical Optics surface integral by a hybrid CPU-graphical processing approach. The resulting code needs more CPU power for ...

    • Feasibility of RFI mitigation in synthetic aperture radiometery based on subspace spatial filtering 

      Hyuk, Park; Camps Carmona, Adriano José; González Gambau, Verónica; Vall-Llossera Ferran, Mercedes Magdalena (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The impact of Radio Frequency Interference (RFI) is a very serious problem for spaceborne microwave radiometry. Many Soil Moisture Ocean Salinity (SMOS) images show serious contamination by the RFI. SMOS is even more ...

    • Filtering and segmentation of polarimetric SAR data based on binary partition trees 

      Alonso González, Alberto; López Martínez, Carlos; Salembier Clairon, Philippe Jean (IEEE Press. Institute of Electrical and Electronics Engineers, 2012-02)
      Article
      Accés restringit per política de l'editorial
      In this paper,we propose the use of binary partition trees (BPT) to introduce a novel region-based and multi-scale polarimetric SAR (PolSAR) data representation. The BPT structure represents homogeneous regions in the ...

    • Formación de imágenes 3D de reflectividad radar en campo próximo con geometría de exploración esférica 

      Broquetas Ibars, Antoni; Jofre Roca, Lluís (1994)
      Text en actes de congrés
      Accés obert
      This document presents an algorithm for the reconstruction of 3D radar reflectivity images using spherical-wave ISAR techniques. The target is illuminated with an spherical wave and near-field backscatterig measurements ...

    • Formación de imágenes ISAR de alta resolución 

      Fabregas Canovas, Francisco Javier; Romeu Robert, Jordi; Broquetas Ibars, Antoni (1992)
      Text en actes de congrés
      Accés obert
      This paper presents the results of ISAR processing of RCS measurements performed over a broad frequency band (12 GHz - 40 GHz). The main purpose is to reach the highest resolution in reflectivity maps in order to identify ...

    • Formación de imágenes radar de apertura sintética (SAR) de precisión mediante técnicas de retroproyección 

      Sensat Nogués, Mònica (Universitat Politècnica de Catalunya, 2015-05-13)
      Projecte/Treball Final de Carrera
      Accés obert
      [ANGLÈS] Satellite, aircraft, drone or rail based on synthetic aperture radars (SAR) offer the opportunity to study landslides and changes occurred to the Earth through the processing of the signal received by the system. ...

    • Fully-focused delay-doppler processing algorithms for radar altimetry systems 

      Hernández Burgos, Sergi (Universitat Politècnica de Catalunya, 2020-07)
      Projecte Final de Màster Oficial
      Accés restringit per acord de confidencialitat
      Evaluation of ice-height change in Antartica, forecasting river discharges or estimating water surface elevation in coastal waters are some of many applications of Altimetry science. The main objective of a satellite Radar ...

    • Ganancia de detectabilidad en radares de alta resoluciónç 

      Broquetas Ibars, Antoni; Elias Fusté, Antoni (1992)
      Text en actes de congrés
      Accés obert
      The paper presents an evaluation of a high resolution technique intended to enhance the radar detectability of targets. The method is based on the coherent integration of the individually resolved target scatterers. The ...

    • GEMINI: geosynchronous SAR for Earth monitoring by interferometry and imaging 

      Monti Guarnieri, Andrea; Tebaldini, Stefano; Rocca, Fabio; Broquetas Ibars, Antoni (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper we discuss a preliminary design for a constellation of geosynchronous (GEO) Synthetic Aperture Radars (SAR). The key design concept is to employ one or more pairs of closely-spaced twin receivers flown ...

    • Generació eficient d'interferogrames diferencials mitjantçant un DEM extrem 

      Monells Miralles, Daniel (Universitat Politècnica de Catalunya, 2008-12-15)
      Projecte/Treball Final de Carrera
      Accés obert
      Aquest projecte està emmarcat en el camp de la interferometria, una aplicació que permet tenir informació al llarg de l’eix d’observació d’una escena. La informació d’alçada s’extreu a partir del que s’anomena interferograma, ...

    • Generación de clutter radar coherente y correlado con estadística tipo K o de Hankel 

      Elias Fusté, Antoni (1989)
      Text en actes de congrés
      Accés obert
      This paper presents an exogenous model to generate K-distributed, coherent and correlated clutter. This model has been tested for exponencial and gaussian autocorrelation functions, showing good fits for autocorrelation ...

    • GeoSAR Mission: Orbit Determination Techniques for a Ground-based Interferometer System 

      Fernàndez Uson, Marc (Universitat Politècnica de Catalunya, 2018-03)
      Projecte Final de Màster Oficial
      Accés restringit per decisió de l'autor
      The aim of Geostationary Synthetic Aperture Radar (GeoSAR) missions is to obtain daily images of events that take place over the Earth's surface. Some of them are critical to monitor (e.g. land stability control, natural ...

    • Geostationary radar orbit determination from radar interferometry 

      Aparicio Aramayo, Oscar Felipe (Universitat Politècnica de Catalunya, 2016-06)
      Treball Final de Grau
      Accés obert
      Geostationary Synthetic Aperture Radars require a precise orbit modelling to obtain high resolutions images of the Earth. Applying interferometric techniques to single received signal from pairs of ground stations it is ...

    • Global L-band vegetation volume fraction estimates for modeling vegetation optical depth 

      Chaparro Danon, David; Jagdhuber, Thomas; Piles Guillem, María; Entekhabi, Dara; Jonard, François; Fluhrer, Anke; Feldman, Andrew F.; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The attenuation of microwave emissions through the canopy is quantified by the vegetation optical depth (VOD), which is related to the amount of water, the biomass and the structure of vegetation. To provide microwave-derived ...

    • GNSS-R derived centimetric sea topography: an airborne experiment demonstration 

      Carreño Luengo, Hugo; Hyuk, Park; Camps Carmona, Adriano José; Fabra Cervellera, Fran; Rius Jordán, Antonio (2013-06)
      Article
      Accés restringit per política de l'editorial
      The results of two airborne experiments performed to test the precision and the relative accuracy of the conventional Global Navigation Satellite Systems Reflectometry (GNSS-R) technique employing only the C/A code are ...

    • GRECO Code Rejuvenated: hybrid CPU-graphical processing 

      Rius Casals, Juan Manuel; Carbo, Alex; Úbeda Farré, Eduard; Heldring, Alexander (IEEE, 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      GRECO code has been updated by replacing the graphical processing technique for computation of Physical Optics surface integral by a hybrid CPU-graphical processing approach. The resulting code needs more CPU power for ...

    • Ground moving target indication using multi-channel SAR with non-uniform displaced phase centers 

      Makhoul Varona, Eduardo; Broquetas Ibars, Antoni; Ruiz Rodon, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper presents an evaluation of a post-Doppler spacetime adaptive Processing (STAP) technique for non-uniformly displaced phase center receivers synthetic aperture radar (SAR). Both theoretical and simulation ...

    • Herramienta de calculo de la potencia de clutter producida por perfiles topograficos reales 

      Elias Fusté, Antoni; Broquetas Ibars, Antoni (1991)
      Text en actes de congrés
      Accés obert
      The surface clutter becames a interference in a radar system that makes it warse. So, ir was built a personal computer tool that obtains the surface clutter power. This tool takes imo consideration the orographic and ...

    • High accuracy synthetic aperture radar (SAR) processor for UAV platforms 

      Rodriguez Torrecillas, Ricard (Universitat Politècnica de Catalunya, 2018-10-18)
      Treball Final de Grau
      Accés obert
      The combination of frequency-modulated continuous-wave (FMCW) technology and synthetic aperture radar (SAR) techniques leads to lightweight cost-effective imagining sensor of high resolution. One limiting factor to use of ...