Now showing items 68-87 of 87

  • RP: Autotest conocimientos previos Circuitos Lineales 

    Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Fabregas Canovas, Francisco Javier; López Martínez, Carlos (2014-01-07)
    External research report
    Open Access
  • SAR Interferometric phase noise reduction using wavelet transform 

    López Martínez, Carlos; Cànovas, Xavier Fàbregas; Chandra, A. M. (IEE-INST ELEC ENG, 2001-05-31)
    Article
    Open Access
    The problem of synthetic aperture radar interferometric phase noise reduction is addressed. A new technique based on discrete wavelet transforms is presented. This technique guarantees high resolution phase estimation ...
  • SAR interferometric phase statistics in wavelet domain 

    López Martínez, Carlos; Fabregas Canovas, Francisco Javier (2002-09-30)
    Article
    Open Access
    Synthetic aperture radar (SAR) interferometry is employed to obtain topographic information. Owing to noise, interferometric information has to be filtered. The wavelet transform can be employed to filter the interferometric ...
  • Simulation of FMCW radar systems based on software defined radio 

    López Martínez, Carlos; Vidal Morera, Marc (2016)
    Conference lecture
    Restricted access - publisher's policy
    This work address the implementation of a Frequency Modulated Continuous Wave radar based on Software Defined Radio. In particular, we have simulated a USRP device implementing the radar system, in order to determine the ...
  • SNR and standard deviation of cGNSS-R and iGNSS-R scatterometric measurements 

    Alonso Arroyo, Alberto; Querol Borràs, Jorge; López Martínez, Carlos; Zavorotny, Valery U.; Hyuk, Park; Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl; Camps Carmona, Adriano José (2017-01-19)
    Article
    Open Access
    This work addresses the accuracy of the Global Navigation Satellite Systems (GNSS)-Reflectometry (GNSS-R) scatterometric measurements considering the presence of both coherent and incoherent scattered components, for both ...
  • Space-Time PolSAR data temporal series processing based on binary partition trees 

    Alonso González, Alberto; López Martínez, Carlos (2012)
    Conference report
    Restricted access - publisher's policy
    A processing technique to exploit temporal series of coregistered Polarimetric Synthetic Aperture Radar (PolSAR) images is presented in this paper. This technique will be based on a region-based and multi-scale data ...
  • Statistical modeling of polarimetric SAR data: a survey and challenges 

    Deng, Xinping; López Martínez, Carlos; Chen, Jinsgon; Han, Pengpeng (2017-04-01)
    Article
    Open Access
    Knowledge of the exact statistical properties of the signal plays an important role in the applications of Polarimetric Synthetic Aperture Radar (PolSAR) data. In the last three decades, a considerable research effort has ...
  • Statistical study of the H/A/Alpha decomposition based on a perturbation analysis of the coherency matrix 

    López Martínez, Carlos; Alonso González, Alberto (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Conference report
    Restricted access - publisher's policy
    The eigendecomposition of the coherency matrix, as well as the Entropy, Anisotropy and mean Alpha angle are crucial for the physical understanding of the scattered echo in SAR polarimetry. This contribution considers a ...
  • Study of the speckle noise effects over the eigen decomposition of polarimetric SAR data: a review 

    López Martínez, Carlos; Alonso González, Alberto; Fabregas Canovas, Francisco Javier (European Space Agency (ESA), 2013)
    Conference report
    Restricted access - publisher's policy
    This paper is focused on considering the effects of speckle noise on the eigen decomposition of the co- herency matrix. Based on a perturbation analysis of the matrix, it is possible to obtain an analytical expression ...
  • Target characterization by means of PolInSAR temporal evolution 

    Alonso González, Alberto; López Martínez, Carlos (Institute of Electrical and Electronics Engineers (IEEE), 2014)
    Conference report
    Restricted access - publisher's policy
    This work focuses on the exploitation of PolSAR and PolInSAR temporal series datasets in the context of change detection and characterization. Instead of a classical pixel-based approach, a Binary Partition Tree (BPT) data ...
  • Temporal PolSAR image series exploitation with binary partition trees 

    Alonso González, Alberto; López Martínez, Carlos; Salembier Clairon, Philippe Jean (IEEE, 2012)
    Conference report
    Restricted access - publisher's policy
    In this paper, the processing of temporal PolSAR image series is addressed through a region-based and multi-scale data representation, the Binary Partition Tree (BPT). This structure contains useful information related ...
  • The polarimetric ratio filter applied to polinsar images 

    Foucher, Samuel; López Martínez, Carlos; Charbonneau, François (IEEE, 2012)
    Conference report
    Restricted access - publisher's policy
    We are proposing recursive filter for the filtering of Single Look Complex PolInSAR data. This recursive filter allows the iterative refinement of a coarse multilook estimate by reintroducing details that have been ...
  • The use of the L2-norm for the analysis of texture on PolSAR data 

    Deng, Xinping; López Martínez, Carlos (VDE-Verlag, 2016)
    Conference lecture
    Restricted access - publisher's policy
    The use of the l2-norms of the scattering vectors is suggested to texture analysis of PolSAR data, with the benefits that neither we need to analyze the polarimetric channels separately, nor we need to filter the data to ...
  • Transpolarizing trihedral corner reflector characterization using a GB-SAR system 

    Ferrer, Pere J.; López Martínez, Carlos; Aguasca Solé, Alberto; Pipia, Luca; González Arbesú, José María; Fabregas Canovas, Francisco Javier; Romeu Robert, Jordi (2011-07)
    Article
    Restricted access - publisher's policy
    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 ...
  • Turbo speckle filtering applied to PolSAR data 

    Farage, Grégory; Foucher, Samuel; López Martínez, Carlos; Bénié, Goze B. (IEEE Computer Society Publications, 2008)
    Conference report
    Open Access
  • Una experiencia de evaluación continuada en Radiación y Propagación 

    Torres Torres, Francisco; Fabregas Canovas, Francisco Javier; López Martínez, Carlos; Corbella Sanahuja, Ignasi (Editorial Universitat Politècnica de València, 2014)
    Conference report
    Open Access
  • Underlying topography estimation and separation of scattering contributions over forests based on polInSAR data 

    López Martínez, Carlos; Alonso González, Alberto; Fabregas Canovas, Francisco Javier; Papathanassiou, Kostantinos (2011)
    Conference report
    Restricted access - publisher's policy
    The work detailed in this paper analyzes the topographic phase retrieval process on forested areas by means of Polarimetric Interferometric SAR data. On the basis of the Random Volume over Ground scattering model, an ...
  • Variable local weight filtering for PolSAR data speckle noise reduction 

    Alonso González, Alberto; López Martínez, Carlos; Salembier Clairon, Philippe Jean (IEEE, 2012)
    Conference report
    Restricted access - publisher's policy
    This paper presents a Polarimetric SAR data speckle filtering technique, based on a combined filtering in the spatial and polarimetric domains. It is based on a bilateral filtering employing distance measures over these ...
  • Wavelet Transform-Based Interferometric SAR Coherence Estimator 

    López Martínez, Carlos; Fabregas Canovas, Francisco Javier; Pottier, Eric (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-12-31)
    Article
    Open Access
    A novel method to estimate interferometric coherence in synthetic aperture radar interferometry is proposed. It is demonstrated that this approach is not affected by the terrain topography, contrary to multilook techniques. ...
  • Wetland inundation monitoring by the synergistic use of ENVISAT/ASAR imagery and ancilliary spatial data 

    Martí Cardona, Belén; Dolz Ripollès, Josep; López Martínez, Carlos (2013)
    Article
    Restricted access - publisher's policy
    on the water resources. In a scenario of climate change and increased anthropogenic pressure, detailedmonitoring of the water resources provides a fundamental tool to assess the ecosystem health and identify potential ...