Now showing items 1-20 of 58

  • A linear scale height Chapman model supported by GNSS occultation measurements 

    Olivares Pulido, Germán; Hernández Pajares, Manuel; Aragón Ángel, Maria Angeles; García Rigo, Alberto (2016-05)
    Conference lecture
    Open Access
    Global Navigation Satellite Systems (GNSS) radio occultations allow the vertical sounding of the Earth's atmosphere, in particular, the ionosphere. The physical observables estimated with this technique permit to test ...
  • Assessment of St. Patrick's Day 2015 Geomagnetic storm impact on EGNOS 

    Hernández Pajares, Manuel; Béniguel, Yannick; Orús Pérez, Raul; Prieto Cerdeira, Roberto; García Rigo, Alberto; Kinrade, J; Kauristie, Kirsti; Schlueter, Stefan; Serant, Damien; Krankowski, Andrzej; Secretan, Hugues; Sampedro Casis, Rodrigo; Prats Menéndez, Xavier (European Space Agency (ESA), 2015)
    Conference lecture
    Restricted access - publisher's policy
    The Monitor project has been designed to monitor ionospheric events that would allow evaluating its impact on European GNSS Systems. It includes a network of ionospheric scintillation monitoring stations in various ...
  • Comparing performances of seven different global VTEC ionospheric models in the IGS context 

    Hernández Pajares, Manuel; Roma Dollase, David; Krankowski, Andrzej; García Rigo, Alberto; Orús Pérez, Raul (International GNSS Service (IGS), 2016)
    Conference report
    Restricted access - publisher's policy
    A summary of the main concepts on Global Ionospheric Map(s) (hereinafter GIM(s)) of Vertical Electron Content (VTEC), with special emphasis on their assessment, is presented in this paper. It is based on the experience ...
  • Comprehensive ionospheric delay modelling for single-frequency GNSS precise positioning: first steps 

    Colombo, Oscar L.; Hernández Pajares, Manuel; Janssen, Volker; García Rigo, Alberto (International GNSS Service (IGS), 2016)
    Conference lecture
    Restricted access - publisher's policy
  • Consistency of seven different GNSS global ionospheric mapping techniques during one solar cycle 

    Roma Dollase, David; Hernández Pajares, Manuel; Krankowski, Andrzej; Kotulak, Kacper; Ghoddousi Fard, Reza; Yuan, Yunbin; Li, Zishen; Zhang, Hongping; Shi, Chuang; Wang, Cheng; Feltens, Joachim; Vergados, Panagiotis; Komjathy, Attila; Schaer, Stefan C.; García Rigo, Alberto; Gómez Cama, José Mª (2017-11-28)
    Article
    Open Access
    In the context of the International GNSS Service (IGS), several IGS Ionosphere Associated Analysis Centers have developed different techniques to provide global ionospheric maps (GIMs) of vertical total electron content ...
  • Contributions to ionospheric determination with global positioning system: solar flare detection and prediction of global maps of total electron content 

    García Rigo, Alberto (Universitat Politècnica de Catalunya, 2012-12-17)
    Doctoral thesis
    Open Access
    Two research studies have been addressed in this thesis. Both of them are of actual scientific interest and are based on processing GNSS data. The first part of this thesis is devoted to GNSS detection and monitoring of ...
  • 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
  • Direct MSTID mitigation in precise GPS processing 

    Hernández Pajares, Manuel; Wielgosz, Pawel; Paziewski, Jacek; Krypiak-Gregorczyk, Anna; Krukowska, Marta; Stepniak, Katarzyna; Kaplon, Jan; Hadas, Tomasz; Sosnica, Krzysztof; Bosy, Jaroslaw; Orús Pérez, Raul; Monte Moreno, Enrique; Yang, Heng; García Rigo, Alberto; Olivares Pulido, Germán (2017-03)
    Article
    Open Access
    In this paper, the authors summarize a simple and efficient approach developed to mitigate the problem in precise GNSS positioning originated by the most frequent ionospheric wave signatures: the Medium Scale Travelling ...
  • Distribution and mitigation of higher-order ionospheric effects on precise GNSS processing 

    Hernández Pajares, Manuel; Aragón Ángel, María Ángeles; Defraigne, Pascale; Bergeot, Nicolas; Prieto Cerdeira, Roberto; García Rigo, Alberto (2014-04)
    Article
    Open Access
    Higher-order ionospheric effects (I2+) are one of the main limiting factors in very precise Global Navigation Satellite Systems (GNSS) processing, for applications where millimeter accuracy is demanded. This paper summarizes ...
  • Electron density extrapolation above F2 peak by the linear Vary-Chap model supporting new Global Navigation Satellite Systems-LEO occultation missions 

    Hernández Pajares, Manuel; García Fernández, Miquel; Rius Carrasco, Antoni; Notarpietro, Riccardo; von Engeln, Axel; Olivares Pulido, Germán; Aragón Ángel, Maria Angeles; García Rigo, Alberto (2017-08)
    Article
    Open Access
    The new radio-occultation (RO) instrument on board the future EUMETSAT Polar System-Second Generation (EPS-SG) satellites, flying at a height of 820 km, is primarily focusing on neutral atmospheric profiling. It will also ...
  • 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 ...
  • 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 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 ...
  • 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 ...
  • Impact and implementation of higher-order ionospheric effects on precise GNSS applications 

    Hadas, Tomasz; Krypiak-Gregorczyk, Anna; Hernández Pajares, Manuel; Kaplon, Jan; Paziewski, Jacek; Wielgosz, Pawel; García Rigo, Alberto; Kazmierski, K.; Sosnica, Krzysztof; Kwasniak, D.; Sierny, J.; Bosy, Jaroslaw; Pucilowski, Marcin; Szyszko, Robert; Portasiak, Krystian; Olivares, German; Gulyaeva, Tamara L.; Orús Pérez, Raul (2017-11)
    Article
    Open Access
    High precision Global Navigation Satellite Systems (GNSS) positioning and time transfer require correcting signal delays, in particular higher-order ionospheric (I2+) terms. We present a consolidated model to correct second- ...
  • Improved MSTID modelling and impact on precise GNSS processing 

    Hernández Pajares, Manuel; Wielgosz, Pawel; Paziewski, Jacek; Krypiak-Gregorczyk, Anna; Stepniak, Katarzyna; Bosy, Jaroslaw; Kaplon, Jan; Hadas, Tomasz; Orús Pérez, Raul; Monte Moreno, Enrique; Yang, Heng; Olivares Pulido, Germán; García Rigo, Alberto (2015)
    Conference lecture
    Restricted access - publisher's policy
  • INSPIRE: DI 1-1 Technical Note with assessment of state-of-the-art of earthquake precursors identification 

    Krankowski, Andrzej; Pulinets, Sergey; Cherniak, Iurii; Hernández Pajares, Manuel; Rothkael, Hanna; Rojas Gregorio, José Ignacio; García Rigo, Alberto (2014-12-25)
    External research report
    Restricted access - confidentiality agreement
  • INSPIRE: DI 1-2 Technical Note with definition of methodology for identification of earthquake signatures 

    Krankowski, Andrzej; Pulinets, Sergey; Cherniak, Iurii; Hernández Pajares, Manuel; Rothkael, Hanna; García Rigo, Alberto (2014-12-25)
    External research report
    Restricted access - confidentiality agreement
  • INSPIRE: DI 2-1 Technical Note describing the design and development of the database with performance criteria 

    Krankowski, Andrzej; Hernández Pajares, Manuel; Pulinets, Sergey; Cherniak, Iurii; Rothkael, Hanna; Rojas Gregorio, José Ignacio; García Rigo, Alberto (2015-01-26)
    External research report
    Restricted access - confidentiality agreement
  • Ionosphere monitoring and forecast activities within the IAG working group “Ionosphere Prediction” 

    Hoque, Mainul; García Rigo, Alberto; Erdogan, Eren; Cueto, M.; Jakowski, Norbert; Berdermann, Jens; Hernández Pajares, Manuel; Schmidt, Michael; Wilken, Volken (2017)
    Conference lecture
    Open Access
    Ionospheric disturbances can affect technologies in space and on Earth disrupting satellite and airline operations, communications networks, navigation systems. As the world becomes ever more dependent on these technologies, ...