Browsing by Subject "Sistema de posicionament global"

Now showing items 1-20 of 428

    • 3D FEM model of ground deformation in Deception Island (Antarctica) 

      Garrido Ballart, Sònia (Universitat Politècnica de Catalunya, 2017-06-16)
      Master thesis
      Open Access
      Covenantee:   Institut de Ciències de la Terra Jaume Almera
      Ground deformation has been demonstrated to be one of the most common signals of volcanic unrest. A variety of processes can cause ground deformation in active volcanic areas (e.g. magmatic processes, pore pressure ...

    • A Collaborative Protocol for Private Retrieval of Location-Based Information 

      Rebollo Monedero, David; Forné Muñoz, Jorge; Subirats Maté, Laia; Solanas, Agustí; Martínez-Ballasté, Antoni (IADIS Press, 2009)
      Conference lecture
      Open Access
      Privacy and security are paramount for the proper deployment of location-based services (LBSs). We present a novel protocol based on user collaboration to privately retrieve location-based information from an LBS provider. ...

    • A context-aware model to provide positioning in disaster relief scenarios 

      Moreno, Daniel; Ochoa, Sergio; Meseguer Pallarès, Roc (2015-10-01)
      Article
      Open Access
      The effectiveness of the work performed during disaster relief efforts is highly dependent on the coordination of activities conducted by the first responders deployed in the affected area. Such coordination, in turn, ...

    • A direct method to estimate atmospheric phase delay for insar with global atmospheric models 

      Hu, Zhongbo; Mallorquí Franquet, Jordi Joan (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Conference lecture
      Restricted access - publisher's policy
      Differential Interferometric Synthetic Aperture Radar (DInSAR) has proved its unprecedented advantages of monitoring ground deformation on large scale with centimeter to millimeter precision in the last two decades. However, ...

    • A generic simulator for aperture synthesis radiometers: Radiative transfer module and end-to-end tests 

      Camps Carmona, Adriano José; Hyuk, Park; Barbosa, José; Bandeiras, J.; Sousa, Ana; d'Addio, Salvatore; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference lecture
      Restricted access - publisher's policy
      The Synthetic Aperture Interferometric Radiometer (SAIR) Performance Simulator (SAIRPS) is a very versatile software tool developed by Deimos Engenharia (Portugal) and the Universitat Politècnica de Catalunya-Barcelona ...

    • A method for scintillation characterization using geodetic receivers operating at 1 Hz 

      Juan Zornoza, José Miguel; Aragón Ángel, Maria Angeles; Sanz Subirana, Jaume; González Casado, Guillermo; Rovira Garcia, Adrià (2017-05-08)
      Article
      Open Access
      Ionospheric scintillation produces strong disruptive effects on global navigation satellite system (GNSS) signals, ranging from degrading performances to rendering these signals useless for accurate navigation. The current ...

    • A Method to determine secondary codes and carrier phases of short snapshot signals 

      Liu, Xiao; Closas Gómez, Pau; Gusi Amigó, Adrià; Rovira Garcia, Adrià; Sanz Subirana, Jaume (2022-12)
      Article
      Open Access
      Recently, the Snapshot Real-Time Kinematic (SRTK) technique was demonstrated, which aims at achieving high accuracy navigation solutions with a very short signal collection. The main challenge in implementing SRTK is the ...

    • A multi-frequency method to improve the long-term estimation of GNSS clock corrections and phase biases 

      Rovira Garcia, Adrià; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo; Ventura Traveset, Javier; Cacciapuoti, Luigi; Schoenemann, Erik (2021-12)
      Article
      Open Access
      The space segment of the Global Navigation Satellite System (GNSS) is equipped with highly stable atomic clocks. In order to use these clocks as references, their time offsets must be estimated from ground measurements as ...

    • A new approach to gross error detection for GPS networks 

      Dalfó Simó, Cristina; Fiol Mora, Miquel Àngel (2019-05-29)
      Article
      Open Access
      We present a new matrix-based approach to detect and correct gross errors in GPS geodetic control networks. The study is carried out by introducing a new matrix, whose entries are powers of a (real or complex) variable, ...

    • A new approach to improve satellite clock estimates, removing the inter-day jumps 

      Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Rovira Garcia, Adrià; González Casado, Guillermo; Ventura Traveset, Javier; Cacciapuoti, Luigi; Schoenemann, Erik (2020)
      Conference report
      Restricted access - publisher's policy
      Time synchronization is one of the main applications of Global Navigation Satellite System (GNSS). Indeed, GNSS satellites are equipped with highly stable atomic clocks, which can be used as clock references. In particular, ...

    • A nonparametric statistical model for the selection of significant variables acting in the deterioration of built façades 

      Serrat Piè, Carles; Gibert Armengol, Vicente; Casas Rius, Joan Ramon; Rapinski, Jacek (International Centre for Numerical Methods in Engineering (CIMNE), 2020)
      Conference report
      Open Access
      Serrat and Gibert (2011) introduced the use of survival analysis techniques for the study of time-to-failure in the facades of a building stock. Those techniques have been implemented in a predictive system that incorporates ...

    • A numerical simulator to evaluate the electromagnetic bias in GNSS-R altimetry 

      Ghavidel, Ali; Schiavulli, Domenico; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference lecture
      Restricted access - publisher's policy
      This paper presents the computed electromagnetic (EM) bias predicted for GNSS-R altimetry systems. First, a synthetic time-evolving sea surface is generated satisfying an ocean surface height spectrum. Then, a direct GNSS ...

    • A review of higher order ionospheric refraction effects on dual frequency GPS 

      Petrie, Elisabeth J.; Hernández Pajares, Manuel; Spalla, Paolo; Moore, Philip; King, Matt A. (2010-11-26)
      Article
      Restricted access - publisher's policy
      Abstract Higher order ionospheric effects are increasingly relevant as precision requirements on GPS data and products increase. The refractive index of the ionosphere is affected by its electron content and the magnetic ...

    • A simulator for GNSS-R polarimetric observations over the ocean 

      Schiavulli, Domenico; Ghavidel, Ali; Camps Carmona, Adriano José; Migliaccio, Muriccio (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      Global Navigation Satellite Systems - Reflec-tometry (GNSS-R) represents an innovative tool for remote sensing. In this paper a facet-based simulator is presented to investigate the polarimetric characteristics of GNSS ...

    • A stratospheric balloon GNSS-R experiment: The 3Cat-2 project in DLR/SNSB BEXUS 

      Carreño Luengo, Hugo; Camps Carmona, Adriano José; Querol Borràs, Jorge; Forte Veliz, Giuseppe Francesco; Onrubia Ibáñez, Raúl; Díez, Raúl (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference lecture
      Restricted access - publisher's policy
      Universitat Politècnica de Catalunya (UPC) - BarcelonaTech Remote Sensing Laboratory focus on the development of breakthrough concepts. The 3Cat-2 mission is on the synergy of GNSS reflectometry and the CubeSat concept. ...

    • A transportation security system applying RFID and GPS 

      Zhang, Ruijian (School of Industrial and Aeronautic Engineering of Terrassa (ETSEIAT). Universitat Politècnica de Catalunya (UPC), 2013-04)
      Article
      Open Access
      Purpose: This paper is about developing a centralized, internet based security tool which utilizes RFID and GPS technology to identify drivers and track the load integrity. Design/methodology/approach: The system will ...

    • A Worldwide ionospheric model for fast precise point positioning 

      Rovira Garcia, Adrià; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo (Institute of Electrical and Electronics Engineers (IEEE), 2015-03-03)
      Article
      Open Access
      Fast precise point positioning (Fast-PPP) is a satellite-based navigation technique using an accurate real-time ionospheric modeling to achieve high accuracy quickly. In this paper, an end-to-end performance assessment of ...

    • AATR an ionospheric activity indicator specifically based on GNSS measurements 

      Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Rovira Garcia, Adrià; González Casado, Guillermo; Ibáñez Segura, Deimos; Orús Pérez, Raul (2018-03-01)
      Article
      Open Access
      This work reviews an ionospheric activity indicator useful for identifying disturbed periods affecting the performance of Global Navigation Satellite System (GNSS). This index is based in the Along Arc TEC Rate (AATR) and ...

    • Accesibilidad en interiores mediante Unity y Google Maps 

      Garcia Galvez, Brian (Universitat Politècnica de Catalunya, 2015-02-05)
      Bachelor thesis
      Restricted access - author's decision
      Imagine being in a foreign airport where you do not know the language or, even worst, you do not know the alphabet. You open the application, the locator introduces your ticket and when you get all the relevant information, ...

    • Accuracy and precision studies for range-only underwater target tracking in shallow waters 

      Masmitjà Rusiñol, Ivan; Bouvet, Pierre-Jean; Gomáriz Castro, Spartacus; Aguzzi, Jacopo; Río Fernandez, Joaquín del; Toma, Daniel (2017)
      Conference report
      Open Access
      This paper studies the precision, and the accuracy, of an underwater target tracking system, using range-only and single-beacon methods, in shallow waters environments. For this study, different field tests have been ...