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  • Inter-system biases solution strategies in multi-GNSS kinematic precise point positioning 

    Li, Mowen; Rovira Garcia, Adrià; Nie, Wenfeng; Xu, Tianhe; Xu, Guochang (2023-07)
    Article
    Open Access
    Estimating inter-system biases (ISBs) is important in multi-constellation Global Navigation Satellite System (GNSS) processing. The present study aims to evaluate and screen out an optimal estimation strategy of ISB for ...

  • Neural network based model for global Total Electron Content forecasting 

    Cesaroni, Claudio; Spogli, Luca; Aragón Ángel, María Ángeles; Fiocca, Michel; Dear, Varuliator; De Franceschi, Giorgiana; Romano, Vincenzo (EDP Sciences, 2020-03)
    Article
    Open Access
    We introduce a novel empirical model to forecast, 24 h in advance, the Total Electron Content (TEC) at global scale. The technique leverages on the Global Ionospheric Map (GIM), provided by the International GNSS Service ...

  • Comparison of GPS analysis strategies for high-accuracy vertical land motion 

    Kierulf, H P; Plag, H P; Bingley, R M; Teferle, N; Demir, C; Cingoz, A; Yildiz, H; Zdunek, R; Jaworski, L; Martínez Benjamín, Juan José; Orús Pérez, Raul; Aragón Ángel, María Ángeles (2008-01)
    Article
    Open Access
    Tide gauges measure sea level changes relative to land. To separate absolute changes in sea level from vertical land movements tide gauges are often co-located with Continuous GPS (CGPS). In order to achieve an accuracy ...

  • The ionosphere prediction service prototype for GNSS users 

    Vadakke Veettil, Sreeja; Cesaroni, Claudio; Aquino, Marcio; De Franceschi, Giorgiana; Berrili, Francesco; Rodriguez, Filippo; Spogli, Luca; Del Moro, Dario; Cristaldi, Alice; Romano, Vincenzo; Ronchini, Roberto; Di Rollo, Stefano; Guyader, Eric; Aragón Ángel, María Ángeles (EDP Sciences, 2019)
    Article
    Open Access
    The effect of the Earth’s ionosphere represents the single largest contribution to the Global Navigation Satellite System (GNSS) error budget and abnormal ionospheric conditions can impose serious degradation on GNSS system ...

  • WIDE AREA Real Time Kinematics (WARTK): nuevas posibilidades de posicionamiento y navegación GNSS precisa a escala continental 

    Aragón Ángel, María Ángeles; Hernández Pajares, Manuel; Juan Zornoza, José Miguel; Sanz Subirana, Jaume (2008-05-05)
    Article
    Open Access
    En este artículo se presenta la nueva técnica Wide Area Real Time Kinematics (WARTK) que permite la extensión de técnicas previas de navegación precisa por satélite, como por ejemplo el Real Time Kinematics (RTK), más allá ...

  • Enhanced neural network model for regional ionospheric modeling and evaluation under different solar-geomagnetic conditions 

    Dong, Yanfeng; Gao, Chengfa; Long, Fengyang; Nie, Wenfeng; Juan Zornoza, José Miguel; Rovira Garcia, Adrià; Zhang, Ruicheng (2023-03-01)
    Article
    Restricted access - publisher's policy
    Monitoring spatiotemporal variations of ionospheric vertical total electron content (VTEC) is crucial for space weather and satellite positioning. In the present study, an enhanced neural network (ENN) model is proposed ...

  • A Method to determine secondary codes and carrier phases of short snapshot signals 

    Liu, Xiao; Closas Gómez, Pau; Gusi Amigó, Adrià; Rovira Garcia, Adrià; Sanz Subirana, Jaume (2022-12)
    Article
    Open Access
    Recently, the Snapshot Real-Time Kinematic (SRTK) technique was demonstrated, which aims at achieving high accuracy navigation solutions with a very short signal collection. The main challenge in implementing SRTK is the ...

  • On the global kinematic positioning variations during the September 2017 solar flare events 

    Nie, Wenfeng; Rovira Garcia, Adrià; Wang, Yong; Zheng, Dunyong; Yan, Lingfei; Xu, Tianhe (John Wiley & sons, 2022-08)
    Article
    Open Access
    Several X-class solar flares (SFs) with different intensities and locations on the solar disk occurred in September 2017. Among them, the X9.3 SF on 6 September 2017 was the most intensive SF in the 24th solar cycle. In ...

  • Applying the geodetic detrending technique for investigating the consistency of GPS L2P(Y) in several receivers 

    Juan Zornoza, José Miguel; Sanz Subirana, Jaume; González Casado, Guillermo; Rovira Garcia, Adrià; Timote Bejarano, Cristhian Camilo; Orús Pérez, Raul (2022-11)
    Article
    Restricted access - publisher's policy
    Global Navigation Satellite System signals have been used for years to study high-frequency fluctuations (f>0.1Hz)intheionosphere. The customary procedure uses the geometry-free (GF) combination ofL1andL2carriers, for which ...

  • The Mechanism for GNSS-Based Kinematic Positioning Degradation at High-Latitudes Under the March 2015 Great Storm 

    Nie, Wenfeng; Rovira Garcia, Adrià; Li, Mowen; Fang, Zhenlong; Wang, Yong; Zheng, Dunyong; Xu, Tianhe (2022-06)
    Article
    Open Access
    In this study, we focus on the kinematic precise point positioning (PPP) solutions at high-latitudes during the March 2015 great geomagnetic storm. We aim to discover the mechanism behind the positioning degradation from ...

  • Network-based ionospheric gradient monitoring to support GBAS 

    Caamaño Albuerne, María; Juan Zornoza, José Miguel; Felux, Michael; Gerbeth, Daniel; González Casado, Guillermo; Sanz Subirana, Jaume (2021-02-11)
    Article
    Open Access
    Large ionospheric gradients acting between a Ground Based Augmentation System (GBAS) reference station and an aircraft on approach could lead to hazardous position errors if undetected. Current GBAS stations provide solutions ...

  • Cloud-based single-frequency Snapshot RTK positioning 

    Liu, Xiao; Ribot, Miguel Ángel; Gusi Amigó, Adriá; Rovira Garcia, Adrià; Sanz Subirana, Jaume; Closas Gómez, Pau (Multidisciplinary Digital Publishing Institute (MDPI), 2021-05-26)
    Article
    Open Access
    With great potential for being applied to Internet of Things (IoT) applications, the concept of cloud-based Snapshot Real Time Kinematics (SRTK) was proposed and its feasibility under zero-baseline configuration was confirmed ...

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