Ara es mostren els items 106-125 de 131

    • 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
      Accés obert
      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
      Accés obert
      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 ...
    • Sentinel-1 InSAR coherence for land cover mapping: a comparison of multiple feature-based classifiers 

      Jacob, Alex; Vicente-Guijalba, Fernando; López Martínez, Carlos; López Sánchez, Juan Manuel; Mallorquí Franquet, Jordi Joan (Institute of Electrical and Electronics Engineers (IEEE), 2020-01-22)
      Article
      Accés obert
      This article investigates and demonstrates the suitability of the Sentinel-1 interferometric coherence for land cover and vegetation mapping. In addition, this study analyzes the performance of this feature along with ...
    • Ship detection in SAR images based on Maxtree representation and graph signal processing 

      Salembier Clairon, Philippe Jean; Liesegang Maria, Sergi; López Martínez, Carlos (Institute of Electrical and Electronics Engineers (IEEE), 2018-01-01)
      Article
      Accés obert
      This paper discusses an image processing architecture and tools to address the problem of ship detection in synthetic-aperture radar images. The detection strategy relies on a tree-based representation of images, here a ...
    • Simulation of FMCW radar systems based on software defined radio 

      López Martínez, Carlos; Vidal Morera, Marc (2016)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      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 ...
    • Sincohmap: land-cover and vegetation mapping using multi-temporal sentinel-1 interferometric coherence 

      Vicente Guijalba, F.; Jacob, Alexander; López-Sánchez Sánchez, Juan Manuel; López Martínez, Carlos; Duro Calvo, Javier; Pottier, Eric; Mallorquí Franquet, Jordi Joan (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
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      InSAR coherence is a promising parameter for land-cover classification and mapping. The ESA SEOM SInCohMap project is devised to test and analyze multi-temporal InSAR coherence potentialities exploiting dense multitemporal ...
    • 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
      Accés obert
      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 ...
    • Soil permittivity estimation over croplands using full and compact polarimetric SAR data 

      Bhogapurapu, Narayanarao; Dey, Subhadip; Bhattacharya, Avik; López Martínez, Carlos; Hajnsek, Irena; Rao, Yalamanchili S. (Institute of Electrical and Electronics Engineers (IEEE), 2022-11-23)
      Article
      Accés obert
      Soil permittivity estimation using Polarimetric Synthetic Aperture Radar (PolSAR) data has been an extensively researched area. Nonetheless, it provides ample scope for further improvements. The vegetation cover over the ...
    • Space-Time PolSAR data temporal series processing based on binary partition trees 

      Alonso González, Alberto; López Martínez, Carlos (2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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
      Accés obert
      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)
      Text en actes de congrés
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      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)
      Text en actes de congrés
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      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)
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      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 ...
    • Target scattering characterization in sar polarimetry using model-free approaches 

      Dey, Subhadip; Bhattacharya, Avik; Frery, Alejandro C.; López Martínez, Carlos (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Comunicació de congrés
      Accés obert
      Target decomposition methods for polarimetric Synthetic Aperture Radar (PolSAR) data aim at explaining the scattering information. In this regard, several conventional model-based methods use scattering power components ...
    • Temporal PolSAR image series exploitation with binary partition trees 

      Alonso González, Alberto; López Martínez, Carlos; Salembier Clairon, Philippe Jean (IEEE, 2012)
      Text en actes de congrés
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      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)
      Text en actes de congrés
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      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)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      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 ...
    • Towards a 20m global building map from Sentinel-1 SAR Data 

      Chini, Marco; Pelich, Ramona; Hostache, Renaud; Matgen, Patrick; López Martínez, Carlos (Multidisciplinary Digital Publishing Institute (MDPI), 2018-11-19)
      Article
      Accés obert
      This study introduces a technique for automatically mapping built-up areas using synthetic aperture radar (SAR) backscattering intensity and interferometric multi-temporal coherence generated from Sentinel-1 data in the ...
    • 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
      Accés restringit per política de l'editorial
      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)
      Text en actes de congrés
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