Now showing items 80-99 of 173

  • 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)
    Conference report
    Open Access
    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)
    Conference report
    Restricted access - publisher's policy
    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 ...
  • 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
    Restricted access - publisher's policy
    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)
    Conference report
    Open Access
    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)
    Conference report
    Open Access
    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)
    Master thesis (pre-Bologna period)
    Open Access
    [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. ...
  • Ganancia de detectabilidad en radares de alta resoluciónç 

    Broquetas Ibars, Antoni; Elias Fusté, Antonio (1992)
    Conference report
    Open Access
    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)
    Conference report
    Restricted access - publisher's policy
    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)
    Master thesis (pre-Bologna period)
    Open Access
    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, Antonio (1989)
    Conference report
    Open Access
    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 ...
  • 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
    Restricted access - publisher's policy
    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)
    Conference report
    Restricted access - publisher's policy
    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)
    Conference report
    Restricted access - publisher's policy
    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, Antonio; Broquetas Ibars, Antoni (1991)
    Conference report
    Open Access
    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 frequency radar cross section of complex objects in real time 

    Rius Casals, Juan Manuel; Vall-Llossera Ferran, Mercedes Magdalena (Institute of Electrical and Electronics Engineers (IEEE), 1991)
    Conference report
    Open Access
    It is shown that real-time RCS (radar cross section) computation is possible with a high-performance graphics workstation. Physical optics (PO) and physical theory of diffraction (PTD) approximation are computed using the ...
  • Identificación selectiva de centros de dispersion radar utilizando tecnicas ISAR 

    Fabregas Canovas, Francisco Javier; Broquetas Ibars, Antoni; Jofre Roca, Lluís (1991)
    Conference report
    Open Access
    This paper presents an ISAR technique which is able to identify the scattering mechanisms in the target structure wich are responsible of each significant lo be of the RCS vs. angle diagram. The technique is based on a ...
  • Image formation for synthetic aperture radar using MATLAB 

    Cequiel Mir, Mireia (Universitat Politècnica de Catalunya, 2008-02-27)
    Master thesis (pre-Bologna period)
    Open Access
    The study of SAR (Synthetic Aperture Radar) image formation using MATLAB it is explained in the following project. The main to use MATLAB in this project was the most important thing to choose it. As MATLAB it is one of ...
  • Impact analysis of wind turbines blockage on doppler weather radar 

    Belmonte Molina, Aniceto; Fabregas Canovas, Francisco Javier (2010)
    Conference report
    Open Access
  • Impact of clutter decorrelation on Geosynchronous SAR 

    Recchia, Andrea; Monti Guarnieri, Andrea; Broquetas Ibars, Antoni; Ruiz Rodon, Josep (VDE Conference Publications, 2014)
    Conference report
    Restricted access - publisher's policy
    We discuss the effects of the clutter on a Geosynchronous SAR system exploiting long integration times (from minutes to hours) to counteract for spread losses and increase azimuth resolution. Only stable targets will be ...
  • Implementació del precondicionador SAI com a eina acceleradora en el càlcul de la Secció Recta Radar de blancs conductors 

    Cresswell Baldellou, Adam Andreu (Universitat Politècnica de Catalunya, 2009-07-17)
    Bachelor thesis
    Open Access