Impact of temporal resolution in global ionospheric models on satellite positioning during low and high solar activity years of solar cycle 24
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Ahmed Abdelaziz
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Xiaodong Ren
Abstract
The ionosphere, partially ionized by solar radiation, is rich in free electrons and ions, affecting satellite navigation signals by altering their speed and path. This interaction often leads to signal delays of 5–10 m, complicating accurate positioning in satellite-based systems. This paper investigates the influence of global ionospheric models (GIMs) with varying Temporal Resolutions (TR) on satellite positioning accuracy and convergence time under different solar activities, represented by the years 2009 (low solar activity) and 2014 (high solar activity). The study utilizes Global Positioning System (GPS) data from three GIMs: CODG, representing the Center for Orbit Determination in Europe (CODE) GNSS model with a 2-h TR; bcom, with a 1-h TR; and b5mg, with a 5-min TR. Analysis was conducted using the GNSS Analysis Software for Multi-constellation and Multi-frequency Precise Positioning across 46 international GNSS service stations under single and dual-frequency strategies. The results indicate that precise point positioning convergence time improved by approximately 18 % and 78 % using single and dual frequencies, depending on the GIM applied. Consequently, positioning accuracy after convergence improved by about 16 % and 27 % in the horizontal and up components for ionospheric-constrained single-frequency PPP models and by 68 % and 79 % in the horizontal and up components for dual-frequency PPP models. Furthermore, vertical total electron content analysis at the MARS station revealed significant variations correlating with solar activity, underscoring the importance of selecting appropriate GIMs for accurate GNSS positioning. Future studies, including multi-solar events, are recommended for comprehensive analysis.
Acknowledgments
The authors are grateful to thank IGS website for providing the data, and the GIMs that used in our study. Furthermore, we are grateful to the GAMP developers for their hard work and amazing contributions.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: The authors state no conflict of interest.
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Research funding: None declared.
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Data availability: IGS website for providing the data, and the GIMs that used in our study. http://www.aiub.unibe.ch/download/CODE/, http://igscb.jpl.nasa.gov/ and http://ionosphere.cn.
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© 2024 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Original Research Articles
- Locally robust Msplit estimation
- Extending geodetic networks for geo-monitoring by supervised point cloud matching
- Evaluation and homogenization of a marine gravity database from shipborne and satellite altimetry-derived gravity data over the coastal region of Nigeria
- Modelling geoid height errors for local areas based on data of global models
- Unmanned aerial vehicle-based aerial survey of mines in Shanxi Province based on image data
- Ionospheric TEC and its irregularities over Egypt: a comprehensive study of spatial and temporal variations using GOCE satellite data
- Monitoring of volcanic precursors using satellite data: the case of Taftan volcano in Iran
- Modeling of temperature deformations on the Dnister HPP dam (Ukraine)
- Impact of temporal resolution in global ionospheric models on satellite positioning during low and high solar activity years of solar cycle 24
- Comparative performance of PPP software packages in atmospheric delay estimation using GNSS data
- Assessment and fitting of high/ultra resolution global geopotential models using GNSS/levelling over Egypt
- An efficient ‘P1’ algorithm for dual mixed-integer least-squares problems with scalar real-valued parameters
- Spatio-temporal trajectory alignment for trajectory evaluation
- Monitoring of networked RTK reference stations for coordinate reference system realization and maintenance – case study of the Czech Republic
- Crustal deformation in East of Cairo, Egypt, induced by rapid urbanization, as seen from remote sensing and GNSS data
Artikel in diesem Heft
- Frontmatter
- Original Research Articles
- Locally robust Msplit estimation
- Extending geodetic networks for geo-monitoring by supervised point cloud matching
- Evaluation and homogenization of a marine gravity database from shipborne and satellite altimetry-derived gravity data over the coastal region of Nigeria
- Modelling geoid height errors for local areas based on data of global models
- Unmanned aerial vehicle-based aerial survey of mines in Shanxi Province based on image data
- Ionospheric TEC and its irregularities over Egypt: a comprehensive study of spatial and temporal variations using GOCE satellite data
- Monitoring of volcanic precursors using satellite data: the case of Taftan volcano in Iran
- Modeling of temperature deformations on the Dnister HPP dam (Ukraine)
- Impact of temporal resolution in global ionospheric models on satellite positioning during low and high solar activity years of solar cycle 24
- Comparative performance of PPP software packages in atmospheric delay estimation using GNSS data
- Assessment and fitting of high/ultra resolution global geopotential models using GNSS/levelling over Egypt
- An efficient ‘P1’ algorithm for dual mixed-integer least-squares problems with scalar real-valued parameters
- Spatio-temporal trajectory alignment for trajectory evaluation
- Monitoring of networked RTK reference stations for coordinate reference system realization and maintenance – case study of the Czech Republic
- Crustal deformation in East of Cairo, Egypt, induced by rapid urbanization, as seen from remote sensing and GNSS data
