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  • Stationary detection for zero velocity update of IMU based on the vibrational FFT feature of land vehicle 

    Li, Mowen; Nie, Wenfeng; Suvorkin, Vladimir; Rovira Garcia, Adrià; Zhang, Wei; Xu, Tianhe; Xu, Guochang (Multidisciplinary Digital Publishing Institute (MDPI), 2024-03-04)
    Article
    Open Access
    The inertial navigation system (INS) and global satellite navigation system (GNSS) are two of the most significant systems for land navigation applications. The inertial measurement unit (IMU) is a kind of INS sensor that ...

  • Advantages of computing ROTI from single-frequency L1 carrier-phase measurements of geodetic receivers operating at 1 Hz 

    Yin, Yu; González Casado, Guillermo; Aragón Ángel, María Ángeles; Juan Zornoza, José Miguel; Sanz Subirana, Jaume; Rovira Garcia, Adrià; Timoté Bejarano, Cristhian Camilo; Orús Pérez, Raul (Institute of Electrical and Electronics Engineers (IEEE), 2024)
    Article
    Open Access
    The customary procedure to compute the rate of total electron content index (ROTI) presents some limitations when using the geometry-free (GF) combination of Global Positioning System (GPS) L1 and L2 carriers tracked by ...

  • Real-time detection and correction of abnormal errors in GNSS observations on smartphones 

    Mu, Hongbo; Yu, Xianwen; Aragón Ángel, María Ángeles; Wang, Jiafu; Wu, Yanze (Multidisciplinary Digital Publishing Institute (MDPI), 2024-08-23)
    Article
    Open Access
    Smartphones, due to the integration of low-cost GNSS chips and linearly polarized antennas, frequently experience abnormal errors in their observations, particularly during positioning on water surfaces. In response to ...

  • Assessment of noise of MEMS IMU sensors of different grades for GNSS/IMU navigation 

    Suvorkin, Vladimir; García Fernández, Miquel; González Casado, Guillermo; Li, Mowen; Rovira Garcia, Adrià (Multidisciplinary Digital Publishing Institute (MDPI), 2024-03-19)
    Article
    Open Access
    Inertial measurement units (IMUs) are key components of various applications including navigation, robotics, aerospace, and automotive systems. IMU sensor characteristics have a significant impact on the accuracy and ...

  • The 2021 la Palma volcanic eruption and its impact on ionospheric scintillation as measured from GNSS reference stations, GNSS-R and GNSS-RO 

    Molina Ordóñez, Carlos; Boudriki Semlali, Badr Eddine; González Casado, Guillermo; Hyuk, Park; Camps Carmona, Adriano José (European Geosciences Union (EGU), 2023-11-29)
    Article
    Open Access
    Ionospheric disturbances induced by seismic activity have been studied in recent years by many authors, showing an impact both before and after the occurrence of earthquakes. In this study, the ionospheric scintillation ...

  • The selection of basic functions for a time-varying model of unmodeled errors in medium and long GNSS baselines 

    Wang, Jiafu; Yu, Xianwen; Aragón Ángel, María Ángeles; Rovira Garcia, Adrià; Wang, Hao (Multidisciplinary Digital Publishing Institute (MDPI), 2023-10-19)
    Article
    Open Access
    Unmodeled errors play a critical role in improving the positioning accuracy of Global Navigation Satellite Systems. Few studies have addressed unmodeled errors in medium and long baselines using their time correlation, ...

  • 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 (2022-12-09)
    Article
    Open Access
    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 ...

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