Browsing by Author "González Casado, Guillermo"
Now showing items 1-20 of 41
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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 AccessIonospheric 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 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 policyTime 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 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 AccessFast 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 AccessThis 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 AccessSingle-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 -
ÀLGEBRA 2 (Examen 2on quadrim)
González Casado, Guillermo (Universitat Politècnica de Catalunya, 2007-05-23)
Exam
Restricted access to the UPC academic community -
Climatology of High and Low Latitude Scintillation in the Last Solar Cycle by Means of the Geodetic Detrending Technique
Rovira Garcia, Adrià; González Casado, Guillermo; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Orús Pérez, Raul (ION Publications (The Institute of navigation), 2020)
Conference report
Restricted access - publisher's policySignals from a Global Navigation Satellite System (GNSS) can be disturbed along the propagation ray path from the satellites to the receivers. The presence of irregularities in the electron density in the near-Earth space ... -
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 policyA 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 ... -
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 AccessThe 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 ... -
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 AccessFast 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 AccessScintillation 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 AccessWe 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 ... -
Impact of medium-scale traveling ionospheric disturbances on network real-time kinematic services: CATNET study case
Timote Bejarano, Cristhian Camilo; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Rovira Garcia, Adrià; González Casado, Guillermo; Escudero Royo, Miguel (2020-07-16)
Article
Open AccessMedium-scale traveling ionospheric disturbances (MSTIDs) are fluctuations in the plasma density that propagate through the upper layer of the atmosphere at velocities of approximately 100 m/s and periods reaching some tens ... -
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 AccessThis 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 policyA 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 decisionThe 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 AccessApplying 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. ...