Browsing by Author "González Casado, Guillermo"Més informacióMés informació

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  • 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 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

  • 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 ...

  • Dynamical behavior of asteroids near resonance: the 4:1 gap and the 7:2 group 

    Grau Sánchez, Miguel; González Casado, Guillermo (1999-08)
    Article
    Restricted access - publisher's policy
    A comparative study of the evolution of the Sun–Jupiter–Asteroid system near the 4:1 and 7:2 resonances is performed by means of two techniques that proceed differently from the Hamiltonian corresponding to the planar ...

  • 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 ...

  • 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 ...

  • 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 ...

  • Improved characterization and modeling of equatorial plasma depletions 

    Blanch Llosa, Estefania; Altadill, David; Juan Zornoza, José Miguel; Camps Carmona, Adriano José; Barbosa, José; González Casado, Guillermo; Riba Sagarra, Jaume; Sanz Subirana, Jaume; Vázquez Grau, Gregorio; Orús Pérez, Raul (2018-08-22)
    Article
    Open Access
    This manuscript presents a method to identify the occurrence of Equatorial Plasma Bubbles (EPBs) with data gathered from receivers of Global Navigation Satellite System (GNSS). This method adapts a previously existing ...

  • Improved modelling of ionospheric disturbances for remote sensing and navigation 

    Camps Carmona, Adriano José; Barbosa, José; Juan Zornoza, José Miguel; Blanch Llosa, Estefania; Altadill, David; González Casado, Guillermo; Vázquez Grau, Gregorio; Riba Sagarra, Jaume; Orus-Perez, Raul (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Conference report
    Restricted access - publisher's policy
    A generic software tool to evaluate the impact of ionospheric disturbances is presented, including low and high latitude physically-based models, and low and high frequency fluctuations. This tool has been developed ...

  • 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 ...

  • Ionosphere/Plasmasphere sounding with ground and space-based GNSS observations 

    González Casado, Guillermo; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Shao, Yixie (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Open Access
    Applying a methodology developed and tested in previous studies, the contribution from the ionospheric and plasmaspheric regions to the total electron content (measured by ground receivers) is analyzed. ...

  • 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

  • Ionospheric and plasmaspheric electron contents inferred from radio occultations and global ionospheric maps 

    González Casado, Guillermo; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Rovira Garcia, Adrià; Aragón Angel, Angela (2015-07-04)
    Article
    Open Access
    We introduce a methodology to extract the separate contributions of the ionosphere and the plasmasphere to the vertical total electron content, without relying on a fixed altitude to perform that separation. The method ...

  • Ionospheric scintillation monitoring using GNSS-R? 

    Camps Carmona, Adriano José; Hyuk, Park; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo; Barbosa, José; Fabbro, V; Lemorton, J; Orús Pérez, Raul (Institute of Electrical and Electronics Engineers (IEEE), 2018)
    Conference report
    Restricted access - publisher's policy
    The characterization of the ionosphere and its impact on the propagation of radio-wave signals has received an increasing interest for satellite communications, Global Navigation Satellite Systems (GNSS) applications (i.e. ...

  • Novel ionospheric activity indicator specifically tailored for GNSS users 

    Sanz Subirana, Jaume; Juan Zornoza, José Miguel; González Casado, Guillermo; Prieto Cerdeira, Roberto; Schlüter, S.; Orús Pérez, Raul (The Institute of Navigation, 2014)
    Conference report
    Restricted access - author's decision
    This work introduces a novel ionospheric activity indicator useful for identifying disturbed periods affecting performance for GNSS users, at regional level. This indicator is based in the “Along Arc TEC Rate (AATR) and ...

  • Origin and modelling of cold dark matter halo properties: IV. Triaxial ellipticity 

    Salvador-Solé, Eduard; Serra, Sinué; Manrique, Alberto; González Casado, Guillermo (2011-04-15)
    External research report
    Open Access
    In the three preceding papers in the series, we presented a model dealing with the global and small-scale structure and kinematics of hierarchically assembled, virialised, collisionless systems, which correctly accounted ...

  • Revisit the calibration errors on experimental slant total electron content (TEC) determined with GPS 

    Nie, Wenfeng; Xu, Tianhe; Rovira Garcia, Adrià; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo; Chen, Wu; Xu, Guochang (2018-06-26)
    Article
    Restricted access - publisher's policy
    The calibration errors on experimental slant total electron content (TEC) determined with global positioning system (GPS) observations is revisited. Instead of the analysis of the calibration errors on the carrier phase ...