Now showing items 1-20 of 112

    • A comparison of phase unwrapping techniques in synthetic aperture radar interferometry 

      Ferrando Bataller, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 1999)
      Conference report
      Open Access
      A comparison of different phase unwrapping techniques based on the least mean square error is presented. A testing environment based on simulated interferograms has been created in order to assess the methods described in ...
    • A new method for ionospheric tomography and its assessment by ionosonde electron density, GPS TEC, and single-frequency PPP 

      Prol, Fabricio dos Santos; Camargo, Paulo de Oliveira; Hernández Pajares, Manuel; Honorato Muella, Marcio Tadeu de Assis (Institute of Electrical and Electronics Engineers (IEEE), 2019-01-05)
      Article
      Open Access
      A new tomographic method was developed with the main goal of mapping the ionosphere in the region of Brazil. The ionospheric background was estimated based on ionosonde and radio-occultation measurements to overcome the ...
    • A new spectral analysis algorithm for SAR data processing of ScanSAR data and medium resolution data without interpolation 

      Ferrando Bataller, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 1998)
      Conference report
      Open Access
      This paper describes a new approach for ScanSAR data image generation, which performs efficient data processing and multilook operation without the need of interpolation stages. This new technique is based on the spectral ...
    • A novel reconstruction algorithm for the improvement of SMOS brightness temperatures 

      González Gambau, Veronica; Turiel, Antonio; Martinez, Justino; Olmedo, Edson; Corbella Sanahuja, Ignasi (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      RFI (Radio Frequency Interference) sources, Sun signal and even land-sea transitions may generate large sidelobes that corrupt SMOS brightness temperature products and therefore, the quality of the soil moisture and sea ...
    • A parallel tool for numerical approximation of 3D electromagnetic surveys in geophysics 

      Castillo Reyes, Octavio; de la Puente Álvarez, Josep; Modesto Galende, David; Puzyrev, Vladimir; Cela Espín, José M. (Instituto Politécnico Nacional (México), 2016)
      Article
      Open Access
      This paper presents an edge-based parallel code for the data computation that arises when applying one of the most popular electromagnetic methods in geophysics, namely, the controlled-source electromagnetic method (CSEM). ...
    • A scalable method to construct compact road networks from GPS trajectories 

      Guo, Yuejun; Bardera Reig, Anton; Fort Masdevall, Marta; Silveira, Rodrigo Ignacio (2020-10-06)
      Article
      Restricted access - publisher's policy
      The automatic generation of road networks from GPS tracks is a challenging problem that has been receiving considerable attention in the last years. Although dozens of methods have been proposed, current techniques suffer ...
    • An adaptive multiresolution method for speckle noise reduction in synthetic aperture radar images 

      Ferrando Bataller, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 1999)
      Conference report
      Open Access
      This paper introduces a method for speckle noise reduction based on multiresolution algorithms and a new adaptive approach. It combines the characteristics for additive noise reduction of soft thresholding with the ...
    • Analysis and calibration of Ground Penetrating Radar shielded antennas 

      Rasol, Mezgeen Abdulrahman Rasol; Pérez Gracia, María de la Vega; Santos Assunçao, Sonia (2018)
      Conference report
      Open Access
      Ground-Penetrating Radar (GPR) is a non-destructive geophysical method applied in many civil engineering applications. The knowledge of the GPR antennas behavior is crucial to obtain accurate results and comprehensive data ...
    • Analysis of satellite constellations for the continuous coverage of ground regions 

      Dai, Guangming; Chen, Xiaoyu; Wang, Maocai; Fernández Aréizaga, Elena; Nguyen, Tuan Nam; Reinelt, Gerhard (2017-11-01)
      Article
      Open Access
      This paper studies the problem of analyzing multisatellite constellations with respect to their coverage capacity of areas on Earth’s surface. The geometric configuration of constellation projection points on Earth’s surface ...
    • Aplicació de diferents tècniques geofísiques per a la caracterització geotècnica del terreny 

      Mases Ylla-Catala, Bernat (Universitat Politècnica de Catalunya, 2019-07-11)
      Bachelor thesis
      Open Access
      Mitjançant diferents tècniques geofísiques, com ara, la tomografia elèctrica, sísmica de refracció i sísmica passiva; es podrà realitzar una caracterització del terreny, obtenint informació sobre la resistivitat, estratigrafia, ...
    • Application of reduced order modelling in geophysics 

      Datta, Prattya; Puente, Josep de la; Modesto Galende, David (Barcelona Supercomputing Center, 2017-05-04)
      Conference report
      Open Access
      The main objective of this work is to effectively design an apriori Reduce Order Method solver to solve parametric high dimensional geophysical problems in a cost effective and fast manner.
    • Applications of GPR in association with other non-destructive-testing methods in building assessment and in geological/geotechnical tasks. State of the art and open issues 

      Dimitriadis, Klisthenis; Pérez Gracia, María de la Vega (2014)
      Conference lecture
      Open Access
      Geophysics is the study of the earth’s interior, using measurements based on physics principles. A part of this, geophysics is also used to explore the interior of construction materials of buildings and Monuments. The ...
    • Assessing the suitability of video imaging for studying the Dynamics of nearshore sandbars in tideless beaches 

      Ribas Prats, Francesca; Ojeda Casillas, Elena; Price, Timothy D.; Guillén Aranda, Jorge (Institute of Electrical and Electronics Engineers (IEEE), 2010)
      Article
      Restricted access - publisher's policy
      Nearshore sandbars, an important natural defense mechanism of the beaches, can be monitored using shore-based video systems. Before studying bar dynamics with video images, we must establish the relationship between the ...
    • Assessment of centre national d'Études spatiales real-time ionosphere maps in instantaneous precise real-time kinematic positioning over medium and long baselines 

      Tomaszewski, Dariusz; Wielgosz, Pawel; Rapinski, Jacek; Krypiak-Gregorczyk, Anna; Kazmierczak, Rafal; Hernández Pajares, Manuel; Yang, Heng; Orús Pérez, Raul (Multidisciplinary Digital Publishing Institute (MDPI), 2020-04-17)
      Article
      Open Access
      Precise real-time kinematic (RTK) Global Navigation Satellite System (GNSS) positioning requires fixing integer ambiguities after a short initialization time. Originally, it was assumed that it was only possible at a ...
    • Assessment of edge-based finite element technique for geophysical electromagnetic problems: efficiency, accuracy and reliability 

      Castillo-Reyes, Octavio; de la Puente, Josep; Puzyrev, Vladimir; Cela, José M. (International Center for Numerical Methods in Engineering (CIMNE), 2015-04)
      Conference lecture
      Open Access
      In Finite Element Methods for solving electromagnetic field problems, the use of Edge Elements has become very popular. In fact, Edge Elements are often said to be a cure to many difficulties that are encountered (particularly ...
    • Assessment of lidar inversion errors for homogeneous atmospheres 

      Rocadenbosch Burillo, Francisco; Comerón Tejero, Adolfo; Pineda Masnou, Daniel (OPTICAL SOC AMER, 1998-04-30)
      Article
      Open Access
      The inversion of lidar returns from homogeneous atmospheres has been done customarily through the well-known slope method. The logarithmic operation over the range-corrected and system-normalized received signal used in ...
    • Assessment of St. Patrick's Day 2015 Geomagnetic storm impact on EGNOS 

      Hernández Pajares, Manuel; Béniguel, Yannick; Orús Pérez, Raul; Prieto Cerdeira, Roberto; García Rigo, Alberto; Kinrade, J; Kauristie, Kirsti; Schlueter, Stefan; Serant, Damien; Krankowski, Andrzej; Secretan, Hugues; Sampedro Casis, Rodrigo; Prats Menéndez, Xavier (European Space Agency (ESA), 2015)
      Conference lecture
      Restricted access - publisher's policy
      The Monitor project has been designed to monitor ionospheric events that would allow evaluating its impact on European GNSS Systems. It includes a network of ionospheric scintillation monitoring stations in various ...
    • Assessment of the capabilities and applicability of ionospheric perturbation indices provided in Europe 

      Borries, Claudia; Wilken, Volken; Jacobsen, Knut Stanley; García Rigo, Alberto; Dziak-Jankowska, Beata; Kervalishvili, Guram; Jakowski, Norbert; Tsagouri, Ioanna; Hernández Pajares, Manuel; Ferreira, Arthur A.; Hoque, Mainul (2020-08-01)
      Article
      Open Access
      Perturbations in the ionosphere are of great interest not only for scientific research, but also for applications using transionospheric radiosignals (e.g. GNSS applications and HF communication), because the transmission ...
    • Assessment of the F2-layer electron density peak inferred from Formosat-3/COSMIC radio occultations over half a Solar Cycle 

      Aragon-Angel, Angela; Limberger, Marco; Hernández Pajares, Manuel; Altadill, David; Dettmering, Denise (2016)
      Conference report
      Restricted access - publisher's policy
      GNSS radio occultation (RO) measurements have become crucial to provide valuable information on the vertical electron density structure of the Ionosphere. Ionospheric key parameters such as the maximum electron density ...
    • Automated GPS Signal-in-Space anomalies monitoring over more than 11 years 

      Sanz Subirana, Jaume; Juan Zornoza, José Miguel; López de Echazarreta, Carlos; González Casado, Guillermo; Rovira Garcia, Adrià; Alonso Alonso, María Teresa; Ibáñez Segura, Deimos (ION Publications (The Institute of navigation), 2019)
      Conference report
      Restricted access - author's decision