Now showing items 1-20 of 25

    • 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 methodology to assess ionospheric models for GNSS 

      Rovira Garcia, Adrià; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo; Ibáñez Segura, Deimos (2015)
      Conference lecture
      Restricted access - publisher's policy
    • A real-time world-wide ionospheric model for single and multi-frequency precise navigation 

      Rovira Garcia, Adrià; Juan Zornoza, José Miguel; Sanz Subirana, Jaume (The Institute of Navigation, 2014)
      Conference lecture
      Restricted access - publisher's policy
      The ionosphere plays an important role in satellite-based navigation, either in standard navigation, with single frequency mass-market receivers, or in precise navigation, with dual frequency receivers. In this work, the ...
    • 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 ...
    • Accuracy of ionospheric models used in GNSS and SBAS: methodology and analysis 

      Rovira Garcia, Adrià; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo; Ibáñez Segura, Deimos (2016-03-01)
      Article
      Restricted access - confidentiality agreement
      © 2015, Springer-Verlag Berlin Heidelberg. The characterization of the accuracy of ionospheric models currently used in global navigation satellite systems (GNSSs) is a long-standing issue. The characterization remains a ...
    • Assessing the quality of ionospheric models through GNSS positioning error: methodology and results 

      Rovira Garcia, Adrià; Ibáñez Segura, Deimos; Orús Pérez, Raul; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo (2020-01-01)
      Article
      Open Access
      Single-frequency users of the global navigation satellite system (GNSS) must correct for the ionospheric delay. These corrections are available from global ionospheric models (GIMs). Therefore, the accuracy of the GIM is ...
    • 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
    • Consolidation and assessment of a technique to provide fast and precise point positioning (Fast-PPP) 

      Rovira Garcia, Adrià (Universitat Politècnica de Catalunya, 2016-01-21)
      Doctoral thesis
      Open Access
      The research of this paper-based dissertation is focused on the Fast Precise Point Positioning (Fast-PPP) technique. The novelty relies on using an accurate ionosphere model, in combination with the standard precise satellite ...
    • Design, implementation and testing of GPS data processing modules for GNSS navigation 

      Rovira Garcia, Adrià (Universitat Politècnica de Catalunya, 2010-01)
      Master thesis (pre-Bologna period)
      Open Access
    • EGNOS 1046 maritime service assessment 

      Ibáñez Segura, Deimos; Rovira Garcia, Adrià; Alonso Alonso, María Teresa; Sanz Subirana, Jaume; Juan Zornoza, José Miguel; González Casado, Guillermo; López Martínez, Manuel (Multidisciplinary Digital Publishing Institute (MDPI), 2020-01-01)
      Article
      Open Access
      The present contribution evaluates how the European Geostationary Navigation Overlay System (EGNOS) meets the International Maritime Organization (IMO) requirements established in its Resolution A.1046 for navigation in ...
    • Experiments on the Ionospheric Models in GNSS 

      Vinh, La The; Quang, Phuong Xuan; García Rigo, Alberto; Rovira Garcia, Adrià; Ibáñez Segura, Deimos (2013)
      Conference report
      Open Access
      In GNSS, one of the main error sources of the Standard Positioning Service (SPS) is introduced by the ionosphere. Although this error can be cancelled by combining two signals at different frequencies, most of the ...
    • Fast precise point positioning: a system to provide corrections for single and multi-frequency navigation 

      Rovira Garcia, Adrià; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo; Bertran Albertí, Eduardo (2016-09)
      Article
      Open Access
      Fast Precise Point Positioning (Fast-PPP) provides Global Navigation Satellite System corrections in real-time. Satellite orbits and clock corrections are shown to be accurate to a few centimeters and a few tenths of a ...
    • Fast-PPP assessment in European and equatorial region near the solar cycle maximum 

      Rovira Garcia, Adrià; Juan Zornoza, José Miguel; Sanz Subirana, Jaume (2014)
      Conference lecture
      Open Access
    • Feasibility of precise navigation in high and low latitude regions under scintillation conditions 

      Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo; Rovira Garcia, Adrià; Camps Carmona, Adriano José; Riba Sagarra, Jaume; Barbosa, José; Blanch Llosa, Estefania; Altadill, David; Orús Pérez, Raul (2018-02-06)
      Article
      Open Access
      Scintillation is one of the most challenging problems in Global Navigation Satellite Systems (GNSS) navigation. This phenomenon appears when the radio signal passes through ionospheric irregularities. These irregularities ...
    • Galileo ionospheric correction algorithm: an optimization study of NeQuick-G 

      Aragón Ángel, Maria Angeles; Zürn, M.; Rovira Garcia, Adrià (2019-11-24)
      Article
      Open Access
      At present most low-cost GNSS receivers operate one frequency in the L band. For themone of the largest error contributions is the delay of radio signals in the Ionosphere. NeQuick-Gisthe official ionospheric correction ...
    • GPS differential code biases determination: methodology and analysis 

      Sanz Subirana, Jaume; Juan Zornoza, José Miguel; Rovira Garcia, Adrià; González Casado, Guillermo (2017-10)
      Article
      Open Access
      We address two main problems related to the receiver and satellite differential code biases (DCBs) determination. The first issue concerns the drifts and jumps experienced by the DCB determinations of the International ...
    • Helmert Variance Component Estimation for Multi-GNSS Relative Positioning 

      Mowen, Li; Nie, Wenfeng; Xu, Tianhe; Rovira Garcia, Adrià; Fang, Zhenlong; Xu, Guochang (Multidisciplinary Digital Publishing Institute (MDPI), 2020-01-25)
      Article
      Open Access
      The Multi-constellation Global Navigation Satellite System (Multi-GNSS) has become the standard implementation of high accuracy positioning and navigation applications. It is well known that the noise of code and phase ...
    • Improvement of the ionospheric radio occultation retrievals by means of accurate global ionospheric maps 

      Shao, Yixie; González Casado, Guillermo; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Rovira Garcia, Adrià (2018-12-22)
      Article
      Restricted access - author's decision
      The Abel inversion method is the classic approach to retrieve electron density profiles from radio occultation measurements, assuming that the electron density is only dependent upon height. In the early 2000s, the total ...
    • Ionospheric and plasmaspheric contribution to the total electron content inferred from ground data and radio-occultation-derived electron density 

      González Casado, Guillermo; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Rovira Garcia, Adrià; Aragón Angel, Angela (2015)
      Conference report
      Restricted access - publisher's policy