Exploració per autor "Lyu, Haixia"

Ara es mostren els items 1-15 de 15

    • A New way of estimating the spatial and temporal components of the vertical total electron content gradient based on UPC-IonSAT global ionosphere maps 

      Liu, Qi; Hernández Pajares, Manuel; Yang, Heng; Monte Moreno, Enrique; García Rigo, Alberto; Lyu, Haixia; Olivares Pulido, Germán; Orús Pérez, Raul (2022-02)
      Article
      Accés obert
      The determination of the ionospheric perturbation degree is essential to describe the ionosphere state for space weather monitoring. A new method for estimating the spatial and temporal components of the Vertical Total ...

    • 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
      Accés restringit per política de l'editorial
      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 ...

    • Climatology and modeling of ionospheric irregularities over Greenland based on empirical orthogonal function method 

      Jin, Yaqi; Clausen, Lasse B. N.; Miloch, Wojciech J.; Høeg, Per; Jarmolowski, Wojciech; Wielgosz, Pawel; Paziewski, Jacek; Milanowska, Beata; Hoque, Mainul; Berdermann, Jens; Lyu, Haixia; Hernández Pajares, Manuel; García Rigo, Alberto (EDP Sciences, 2022-05-31)
      Article
      Accés obert
      This paper addresses the long-term climatology (over two solar cycles) of total electron content (TEC) irregularities from a polar cap station (Thule) using the rate of change of the TEC index (ROTI). The climatology reveals ...

    • Contributions to ionospheric modeling with GNSS in mapping function, tomography and polar electron 

      Lyu, Haixia (Universitat Politècnica de Catalunya, 2020-11-17)
      Tesi
      Accés obert
      This dissertation focuses on determining the vertical electron content distribution in low and high vertical resolution from ground-based and LEO on board GNSS data and improving the knowledge of ionosphere climatology in ...

    • Electron density retrieval from truncated Radio Occultation GNSS data 

      Lyu, Haixia; Hernández Pajares, Manuel; Monte Moreno, Enrique; Cardellach Galí, Estel (2019-06-01)
      Article
      Accés obert
      This paper summarizes the definition and validation of two complementary new strategies, to invert incomplete Global Navigation Satellite System Radio-Occultation (RO) ionospheric measurements, such as the ones to be ...

    • Estimation of polar depletion regions by VTEC contrast and watershed enhancing 

      Monte Moreno, Enrique; Hernández Pajares, Manuel; Lyu, Haixia; Yang, Heng; Aragon-Angel, Angela (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Article
      Accés obert
      This article presents a method for determining near-Pole ionization depletion regions and troughs from global navigation satellite system (GNSS) vertical total electron content (VTEC) maps. To define the regions, we use ...

    • GNSS solar astronomy in real-time during more than one solar cycle 

      Hernández Pajares, Manuel; García Rigo, Alberto; Monte Moreno, Enrique; Liu, Qi; Roma Dollase, David; Yang, Heng; Beniguel, Yannick; Moreno Borrás, David; Fors Aldrich, Octavi; Lyu, Haixia; Orús Pérez, Raul; Ventura Traveset, Javier (Elsevier, 2023-12-09)
      Article
      Accés obert
      This work presents a summary of the continuous non-stop (hereinafter 24/7) real-time measurement and warning system for EUV solar activity, which is based on worldwide multifrequency Global Navigation Satellite Systems ...

    • Influence of temporal resolution on the performance of global ionospheric maps 

      Liu, Qi; Hernández Pajares, Manuel; Lyu, Haixia; Goss, Andreas (2021-03)
      Article
      Accés obert
      Global ionosphere maps (GIM) computed from dual-frequency GNSS measurements have been widely used for monitoring ionosphere as well as providing ionospheric corrections in Space Geodesy since 1998. This work focuses on a ...

    • Ionospheric storm scale index based on high time resolution UPC-IonSAT global ionospheric maps (IsUG) 

      Liu, Qi; Hernández Pajares, Manuel; Lyu, Haixia; Nishioka, Michi; Yang, Heng; Monte Moreno, Enrique; Gulyaeva, Tamara L.; Beniguel, Yannick; Wilken, Volker; Olivares Pulido, Germán; Orús Pérez, Raul (2021-11)
      Article
      Accés obert
      The ionospheric storms have adverse effects on the radio communications, satellite communications and also the Global Navigation Satellite Systems (GNSS) application. A new Ionospheric storm Scale from Universitat Politècnica ...

    • Ionospheric tomographic common clock model of undifferenced uncombined GNSS measurements 

      Olivares Pulido, Germán; Hernández Pajares, Manuel; Lyu, Haixia; Gu, Shengfeng; García Rigo, Alberto; Graffigna, Victoria; Tomaszewski, Dariusz; Wielgosz, Pawel; Rapinski, Jacek; Krypiak-Gregorczyk, Anna; Kazmierczak, Rafal; Orús Pérez, Raul (2021-10-13)
      Article
      Accés obert
      In this manuscript, we introduce the Ionospheric Tomographic Common Clock (ITCC) model of undifferenced uncombined GNSS measurements. It is intended for improving the Wide Area precise positioning in a consistent and simple ...

    • Polar electron content from GPS data-based global ionospheric maps: assessment, case studies, and climatology 

      Lyu, Haixia; Hernández Pajares, Manuel; Aragón Ángel, Maria Angeles; Monte Moreno, Enrique; An, Jiachun; Liu, Jingbin (2020-04-22)
      Article
      Accés obert
      The electron content distribution of the north and south polar ionosphere from 2001 to the beginning of 2019 is analyzed by using the UQRG global ionospheric map (GIM) of vertical total electron content (VTEC), computed ...

    • Quasi-4-dimension ionospheric modeling and its application in PPP 

      Gu, Shengfeng; Chengkun, Gan; Chengpeng, He; Lyu, Haixia; Hernández Pajares, Manuel; Yidong, Lou; Jianghui, Geng; Qile, Zhao (2022-11-02)
      Article
      Accés obert
      Ionospheric delay modeling is not only important for GNSS based space weather study and monitoring, but also an efficient tool to overcome the long convergence time of PPP. In this study, a novel model, denoted as Q4DIM ...

    • 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
      Accés obert
      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 ...

    • The Barcelona ionospheric mapping function (BIMF) and its application to northern mid-latitudes 

      Lyu, Haixia; Hernández Pajares, Manuel; Nohutcu, Metin; García Rigo, Alberto; Zhang, Zhongzhi; Liu, Jingnan (2018-04-26)
      Article
      Accés obert
      A simple way of improving the Global Navigation Satellite Systems (GNSS) slant ionospheric correction from Vertical Total Electron Content (VTEC) models is presented. In many GNSS applications, a mapping function is required ...

    • The implications of ionospheric disturbances for precise GNSS positioning in Greenland 

      Paziewski, Jacek; Høeg, Per; Sieradzki, Rafal; Jin, Yaqi; Jarmolowski, Wojciech; Hoque, Mainul; Berdermann, Jens; Hernández Pajares, Manuel; Wielgosz, Pawel; Lyu, Haixia; Miloch, Wojciech J.; Orús Pérez, Raul (EDP Sciences, 2022-09-14)
      Article
      Accés obert
      Ionospheric irregularities impair Global Navigation Satellite System (GNSS) signals and, in turn, affect the performance of GNSS positioning. Such effects are especially evident at low and high latitudes, which are currently ...