Now showing items 21-40 of 145

  • 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 ...
  • Evaluation of the ionospheric F2 characteristics inferred from radio occultations exploiting the availability of FORMOSAT-3/COSMIC data over half a solar cycle 

    Aragón Ángel, Maria Angeles; Limberger, Marco; Hernández Pajares, Manuel; Altadill, David; Erdogan, Eren; Schmidt, Michael (ION Publications (The Institute of navigation), 2016)
    Conference report
    Restricted access - publisher's policy
    This contribution presents the assessment, on both the maximum electron density (NmF2) and the corresponding peak height of the F2 layer (hmF2), of the overall performance of such ionospheric key parameters inferred from ...
  • Extended version. Occurrence of solar flares viewed with GPS: statistics and fractal nature 

    Monte Moreno, Enrique; Hernández Pajares, Manuel (2014-09-05)
    External research report
    Restricted access - publisher's policy
    In this paper we describe the statistical properties of the EUV solar flux sudden variation. The solar flux variation is modeled as a time series characterized by the subsolar VTEC (Vertical Total Electron Content) ...
  • Fast LAMBDA-based ambiguity resolution combined with WARTK technique for Galileo data simulated using ESA's Galileo Signal Validation Facility 

    Odijk, Dennis; De Bakker, Peter; Verhagen, Sandra; Teunissen, Peter J. G.; Hernández Pajares, Manuel; Samson, Jaron (2009-12)
    Conference report
    Restricted access - publisher's policy
    This contribution addresses the effect of having a triple frequency Global Navigation Satellite System (GNSS) on ambiguity resolution of long baselines, i.e. baselines for which the differential ionospheric delays cannot ...
  • Fast Precise Point Positioning based on real-time ionospheric modelling 

    Juan Zornoza, José Miguel; Hernández Pajares, Manuel; Sanz Subirana, Jaume; Samson, Jaron; Tossaint, Michel Mathias Maria (2012)
    Conference lecture
    Restricted access - publisher's policy
    Summary of main results of new technique Fast Precise Point Positioning developed in the framework of the “Enhanced Precise Point Positioning (EPPP) GNSS multifrequency user algorithm” ESA funded project. -The precise ...
  • Fast Precise Point Positioning for decimeter-error-level navigation for multi and single-frequency users of Global Navigation Satellite Systems 

    Juan Zornoza, José Miguel; Hernández Pajares, Manuel; Sanz Subirana, Jaume; Samson, J.; Tossaint, M. (2012)
    Conference lecture
    Restricted access - publisher's policy
    This manuscript summarizes the new algorithm of Fast Precise Point Positioning (FPPP) the developed during the projects "Enhanced PPP GNSS multifrequency user algorithm" nd “Precise Real Time Orbit Determination and Time ...
  • Feasibility of GNSS-R ice sheet altimetry in Greenland using TDS-1 

    Rius, Antonio; Cardellach, Estel; Fabra, Fran; Li, Weiqiang; Ribó Vedrilla, Serni; Hernández Pajares, Manuel (2017-07-19)
    Article
    Open Access
    Radar altimetry provides valuable measurements to characterize the state and the evolution of the ice sheet cover of Antartica and Greenland. Global Navigation Satellite System Reflectometry (GNSS-R) has the potential to ...
  • FES-WARTK final presentation 

    Toledo, M; Fernández-Hernández, I.; Verhagen, S; Hernández Pajares, Manuel; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Aragón Ángel, María Ángeles; Ramos Bosch, Pedro; Odijk, D; De Bakker, Peter; Van der Marel, Hans (-, 2008)
    Conference report
    Restricted access - confidentiality agreement
  • GIM-TEC adaptive ionospheric weather assessment and forecast system 

    Gulyaeva, Tamara L.; Arikan, Feza; Hernández Pajares, Manuel; Stanislawska, Iwona (2013-09)
    Article
    Open Access
    The Ionospheric Weather Assessment and Forecast (IWAF) system is a computer software package designed to assess and predict the world-wide representation of 3-D electron density profiles from the Global Ionospheric Maps ...
  • Global distribution of ionospheric scintillations from the Real-Time GPS ROTI 

    García Rigo, Alberto; Hernández Pajares, Manuel; Roma-Dollase, David (2018)
    Conference lecture
    Open Access
    A global real-time monitoring system has been implemented in the frame of ESA-ESTEC/EGNOS-POfunded project MONITOR. It is based on world-wide GNSS datastreams distributed by means of NTRIP and provides multiple ionospheric ...
  • Global ionospheric monitoring and navigation systems 

    Feltens, J.; Angling, M; Jakowski, Norbert; Hernández Pajares, Manuel; Zandbergen, R. (2010)
    Lecture
    Open Access
  • Global prediction of the vertical total electron content of the ionosphere based on GPS data 

    García Rigo, Alberto; Monte Moreno, Enrique; Hernández Pajares, Manuel; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Aragón Ángel, María Ángeles; Salazar Hernández, Dagoberto José (2011-12-29)
    Article
    Open Access
    Although vertical total electron content (VTEC) forecasting is still an open subject of research, the use of predictions of the ionospheric state at a scale of several days is an area of increased interest. A global VTEC ...
  • GNSS data management and processing with the GPSTk 

    Salazar Hernández, Dagoberto José; Hernández Pajares, Manuel; Juan Zornoza, José Miguel; Sanz Subirana, Jaume (2010)
    Article
    Restricted access - publisher's policy
    We organize complex problems in simple ways using a GNSS data management strategy based on ‘‘GNSS Data Structures’’ (GDS), coupled with the open source ‘‘GPS Toolkit’’ (GPSTk) suite. The code resulting from using the ...
  • GNSS-Lab tool architecture design document 

    Ramos Bosch, Pedro; Hernández Pajares, Manuel; Juan Zornoza, José Miguel; Sanz Subirana, Jaume (2009-10-29)
    External research report
    Restricted access - confidentiality agreement
    This document contains the detailed information related to the design and architecture of the gLAB software package.
  • GNSS-Lab tool Software User Manual 

    Ramos Bosch, Pedro; Hernández Pajares, Manuel; Juan Zornoza, José Miguel; Sanz Subirana, Jaume (2010-10-08)
    External research report
    Restricted access - author's decision
  • GNSS-Lab tool user software requirements specification 

    Ramos Bosch, Pedro; Sanz Subirana, Jaume; Hernández Pajares, Manuel; Juan Zornoza, José Miguel (2009-05-07)
    External research report
    Restricted access - confidentiality agreement
  • GNSS transpolar earth reflectometry exploriNg system (G-TERN): mission concept 

    Cardellach Galí, Estel; Wickert, Jens; Baggen, Rens; Camps Carmona, Adriano José; Hernández Pajares, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2018-03-09)
    Article
    Open Access
    The global navigation satellite system (GNSS) Transpolar Earth Reflectometry exploriNg system (G-TERN) was proposed in response to ESA's Earth Explorer 9 revised call by a team of 33 multi-disciplinary scientists. The ...
  • GPS as a solar observational instrument: real-time estimation of EUV photons flux rate during strong, medium, and weak solar flares 

    Singh, Talwinder; Hernández Pajares, Manuel; Monte Moreno, Enrique; García Rigo, Alberto; Olivares Pulido, Germán (2015-12-15)
    Article
    Open Access
    In this manuscript, the authors show how the Global Navigation Satellite Systems, GNSS (exemplified in the Global Positioning System, GPS), can be efficiently used for a very different purpose from that for which it was ...
  • GSAC - One proposal of ISL frequencies for potential Galileo modernization with Intersatellite Links ISL double benefit on GNSS satellite orbits- clocks improvement and ionospheric tomography: What , Why & How 

    Defraigne, Pascale; Elgered, G.; Hernández Pajares, Manuel (2014-05-28)
    External research report
    Restricted access - confidentiality agreement