Recent Submissions

  • Assessment of GRAS ionospheric measurements for ionospheric model assimilation 

    Mainul Hoque, Mohammed; Prol, Fabricio dos Santos; Hernández Pajares, Manuel; Notarpietro, Riccardo; Yuan, Liangliang; Olivares Pulido, Germán; Graffigna, Victoria; von Engeln, Axel; Marquardt, Christian (Multidisciplinary Digital Publishing Institute (MDPI), 2023-06-15)
    Article
    Open Access
    We conducted a study to assess the GNSS (Global Navigation Satellite System) Receiver for Atmospheric Sounding (GRAS) ionospheric data quality by processing Radio Occultation (RO) observations of ionospheric products. The ...
  • Real-time tomographic inversion of truncated ionospheric GNSS radio occultations 

    Olivares Pulido, Germán; Hernández Pajares, Manuel; Monte Moreno, Enrique; Lyu, Haixia; Graffigna, Victoria; Cardellach Galí, Estel; Mainul Hoque, Mohammed; Prol, Fabricio dos Santos; Notarpietro, Riccardo; García Fernández, Miquel (Multidisciplinary Digital Publishing Institute (MDPI), 2023-06-19)
    Article
    Open Access
    This paper presents a new way of combining Abel inversion and the Chapman model with a linearly increasing scale height to retrieve ionospheric electron density vertical profiles from truncated-sounding radio-occultation ...
  • Study of ionospheric bending angle and scintillation profiles derived by GNSS radio-occultation with MetOp-A satellite 

    Prol, Fabricio dos Santos; Mainul Hoque, Mohammed; Hernández Pajares, Manuel; Yuan, Liangliang; Olivares Pulido, Germán; von Engeln, Axel; Marquardt, Christian; Notarpietro, Riccardo (Multidisciplinary Digital Publishing Institute (MDPI), 2023-03-20)
    Article
    Open Access
    In this work, a dedicated campaign by MetOp-A satellite is conducted to monitor the ionosphere based on radio-occultation (RO) measurements provided by the onboard GNSS (Global Navigation Satellite System) Receiver for ...
  • A new method of electron density retrieval from MetOp-A’s truncated radio occultation measurements 

    Mainul Hoque, Mohammed; Yuan, Liangliang; Prol, Fabricio dos Santos; Hernández Pajares, Manuel; Notarpietro, Riccardo; Jakowski, Norbert; Olivares Pulido, Germán; von Engeln, Axel; Marquardt, Christian (Multidisciplinary Digital Publishing Institute (MDPI), 2023-03-03)
    Article
    Open Access
    The radio occultation (RO) measurements of the Global Navigation Satellite System’s (GNSS’s) signals onboard a Low Earth Orbiting (LEO) satellite enable the computation of the vertical electron density profile from the LEO ...
  • Pre-earthquake ionospheric anomalies before three major earthquakes by GPS-TEC and GIM-TEC data during 2015–2017 

    Tariq, Muhammad Arslan; Shah, Munawar; Hernández Pajares, Manuel; Iqbal, Talat (2019-04-01)
    Article
    Restricted access - publisher's policy
    The dual-frequency satellite-based measurements from Global Positioning System (GPS) may provide feasible ways of studying and potentially detecting of earthquake (EQ) related anomalies in the ionosphere. In this paper, ...
  • Ionospheric VTEC variations over Pakistan in the descending phase of solar activity during 2016–17 

    Tariq, Muhammad Arslan; Shah, Munawar; Hernández Pajares, Manuel; Iqbal, Talat (2019-06-01)
    Article
    Restricted access - publisher's policy
    This paper presents the variations of the ionospheric Vertical Total Electron Content (VTEC) observed over Pakistan at the verge of low- to mid-latitude regions during the years 2016–17 of the descending phase of the solar ...
  • Retrieving geophysical signals from GPS in the La Plata River region 

    Graffigna, Victoria; Brunini, Claudio; Gende, Mauricio; Hernández Pajares, Manuel; Galván, Romina de los Ángeles; Oreiro, Fernando (2019-06-08)
    Article
    Restricted access - publisher's policy
    Over the last few years, efforts to model short-term deformations of the Earth’s crust have multiplied. Sudden water level rise can cause sporadic, but significant, motions in the solid Earth’s surface. In this work, we ...
  • IGS real-time service for global ionospheric total electron content modeling 

    Li, Zishen; Wang, Ningbo; Hernández Pajares, Manuel; Yuan, Yunbin; Krankowski, Andrzej; Liu, Ang; Zha, Jiuping; García Rigo, Alberto; Roma Dollase, David; Yang, Heng (2020-02-18)
    Article
    Restricted access - publisher's policy
    Benefiting from global multi-frequency and multi-constellation GNSS measurements provided by the experimental International GNSS real-time service (IGS RTS), a predicting-plus-modeling approach employed by Chinese Academy ...
  • High-rate Doppler-aided cycle slip detection and repair method for low-cost single-frequency receivers 

    Zhao, Jiaojiao; Hernández Pajares, Manuel; Li, Zishen; Wang, Liang; Yuan, Hong (2020-06-08)
    Article
    Restricted access - publisher's policy
    Carrier phase cycle slips can be an important source of error in precise Global Navigation Satellite System (GNSS) positioning. In such cases, cycle slips can seriously compromise the positioning accuracy and reliability, ...
  • A new way of improving global ionospheric maps by ionospheric tomography: consistent combination of multi-GNSS and multi-space geodetic dual-frequency measurements gathered from vessel-, LEO- and ground-based receivers 

    Hernández Pajares, Manuel; Lyu, Haixia; García Fernández, Miquel; Orús Pérez, Raul (2020-08)
    Article
    Restricted access - publisher's policy
    In this work, we introduce a new way of improving the sligthly best performing global ionospheric model (GIM) within the International GNSS Service, the UQRG produced by UPC-IonSAT with the TOMION dual-layer voxel model ...
  • Generation of proxy GIM-TEC for extreme storms before the Era of GNSS observations 

    Gulyaeva, Tamara L.; Shubin, Valentin; Haralambous, Haris; Hernández Pajares, Manuel; Stanislawska, Iwona (John Wiley & sons, 2022-01)
    Article
    Open Access
    For the first time, we reconstructed global distribution of both the total electron content disturbance W index and TEC values for eight extreme storms (Dst < -250 nT) occurred before the epoch of GNSS observations in solar ...
  • Topside ionospheric tomography exclusively based on LEO POD GPS carrier phases: application to autonomous LEO DCB estimation 

    Hernández Pajares, Manuel; Olivares Pulido, Germán; Hoque, Mainul; Prol, Fabricio dos Santos; Yuan, Liangliang; Notarpietro, Riccardo; Graffigna, Victoria (Multidisciplinary Digital Publishing Institute (MDPI), 2023-01-08)
    Article
    Open Access
    This paper presents a novel technique to estimate DCBs from GPS transmitters and receivers on-board Low Earth Orbit (LEO) satellites. The technique consists of obtaining the DCBs as residuals from the difference between ...

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