Now showing items 1-20 of 87

  • 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 ...
  • A method for real-time identification and tracking of traveling ionospheric disturbances using ionosonde data: first results 

    Altadill, David; Segarra, Antoni; Blanch, Estefania; Juan Zornoza, José Miguel; Paznukhov, Vadym V.; Buresova, Dalia; Galkin, Ivan; Reinisch, Bodo W.; Belehaki, Anna (2020-01-20)
    Article
    Open Access
    Traveling Ionospheric Disturbances (TIDs) are wave-like propagating irregularities that alter the electron density environment and play an important role spreading radio signals propagating through the ionosphere. A method ...
  • 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
  • Answer to the comments on “Confirming geomagnetic Sfe by means of a solar flare detector based on GNSS” 

    Curto Subirats, Juan Jose; Juan Zornoza, José Miguel; Timote Bejarano, Cristhian Camilo (2020-04-20)
    Article
    Open Access
    Hernández-Pajares and García-Rigo have written a document criticizing our paper “Confirming geomagnetic Sfe by means of a solar flare detector based on GNSS. J Space Weather Space Clim 9: A42. https://doi.org/10.1051/swsc/2019040” ...
  • 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 ...
  • 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
  • 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 ...
  • Characterization and modelling of the ionosphere for EGNOS development and qualification 

    Schlüter, S.; Prieto Cerdeira, Roberto; Orús Pérez, Raul; Lam, J.P.; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Hernández Pajares, Manuel (2013)
    Conference lecture
    Restricted access - publisher's policy
    The availability of representative data samples, models and statistical information derived from the analysis of parameters that adequately describe the state of the ionosphere are key elements for the design, verification ...
  • Confirming geomagnetic Sfe by means of a solar flare detector based on GNSS 

    Curto Subirats, Juan Jose; Juan Zornoza, José Miguel; Timote Bejarano, Cristhian Camilo (2019-11-28)
    Article
    Open Access
    Solar Flares (SF) refer to sudden increases of electromagnetic radiation from the Sun lasting from minutes to hours. Irradiance in the Extremely Ultra-Violet (EUV) or X band is enhanced and it can produce a sudden ...
  • Consolidated characterisation of an ionospheric indicator for the definition of EGNOS Ionospheric Conditions 

    Juan Zornoza, José Miguel; Sanz Subirana, Jaume (2014-04-29)
    External research report
    Restricted access - confidentiality agreement
  • Definition of an SBAS ionospheric activity indicator and its assessment over Europe and Africa During the last solar cycle 

    Sanz Subirana, Jaume; Juan Zornoza, José Miguel; Hernández Pajares, Manuel; Prieto Cerdeira, Roberto; Schlueter, Stefan (2013)
    Conference lecture
    Restricted access - publisher's policy
    In this work, an ionospheric activity indicator is defined based in the “weighted” Along Arc TEC rate (AATR). It is shown that this indicator, which can be easily computed from the GPS carrier phases, is well correlated ...
  • Description of the experiment set-up in Vietnam 

    Quang, Phuong Xuan; Vinh, La The; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; García Rigo, Alberto; Hai Tung, Ta (2013-07-03)
    External research report
    Restricted access - author's decision
  • 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 ...
  • Enhanced precise point positioning for GNSS users 

    Juan Zornoza, José Miguel; Hernández Pajares, Manuel; Sanz Subirana, Jaume; Ramos Bosch, Pedro; Aragón Ángel, María Ángeles; Orus, R.; Ochieng, W.; Feng, S; Jofre, Martí; Coutinho, P; Samson, Jaron; Tossaint, Michel Mathias Maria (Institute of Electrical and Electronics Engineers (IEEE), 2012-09-21)
    Article
    Restricted access - publisher's policy
    This paper summarizes the main results obtained during the development of an Enhanced Precise Point Positioning (EPPP) Global Navigation Satellite Systems multifrequency user algorithm. The main innovations include the ...
  • EVA: GPS-based extended velocity and acceleration determination 

    Salazar Hernández, Dagoberto José; Hernández Pajares, Manuel; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Aragón Ángel, María Ángeles (2010-12-01)
    Article
    Restricted access - publisher's policy
    In this work, a new GPS carrier phase-based velocity and acceleration determination method is presented that extends the effective range of previous techniques. The method is named ‘EVA’, and may find applications in ...
  • 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
  • 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 ...