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Título: | IGS real-time service for global ionospheric total electron content modeling |
Autor: | Li, Zishen; Hernández-Pajares, Manuel CSIC ORCID; Yuan, Yunbin; Krankowski, Andrzej; Liu, A.; Zha, Jiuping; García-Rigo, Alberto; Roma-Dollase, David CSIC ORCID CVN; Yang, Heng; Laurichesse, Denis; Blot, Alexis | Palabras clave: | Real-time global ionospheric maps Real-time service (RTS) RT experimental IGS combined ionospheric product State space representation (SSR) Total electron content (TEC) |
Fecha de publicación: | 1-mar-2020 | Editor: | Springer Nature | Citación: | Journal of Geodesy 94(3): 32 (2020) | Resumen: | 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 of Sciences (CAS) for the routine generation of real-time global ionospheric maps (RT-GIM) is first reported. Along with RT-GIMs generated by Universitat Politècnica de Catalunya (UPC), the quality of CAS and UPC RT-GIMs in IONEX format is assessed during a low soar activity period from September 2017 to December 2019. The differential slant total electron contents (dSTEC) derived from 50 GPS stations of the IGS and Jason-3 vertical TECs (VTEC) over the ocean are used as references. In comparison with different reference TECs, CAS and UPC RT-GIMs are approximately 1.7–4.9% and 8.6–12.5% worse than the respective post-processed GIMs CASG and UQRG, respectively. Using RTCM ionospheric data streams from CAS, Centre National d’Etudes Spatiales (CNES) and UPC, the first experimental IGS combined RT-GIM is generated and validated in actual real-time conditions. Compared to Jason-3 VTEC measurements available during the period of common availability, from October 2018 to April 2019, RT-GIM discrepancies present similar relative RMS errors, which are 33, 36, 36 and 38% for CNES, combined one, UPC and CAS, respectively. Aside from a better understanding of the influence of working in the original IONEX versus RTCM ionospheric formats, the update to a new experimental adaptation of RT strategy is highlighted by UPC, and the computation of multi-layer RT-GIM is emphasized by CAS in view of the inadequacy of single-layer ionospheric assumption in the presence of large latitudinal gradients. | Versión del editor: | http://doi.org/10.1007/s00190-020-01360-0 | URI: | http://hdl.handle.net/10261/236664 | DOI: | 10.1007/s00190-020-01360-0 | Identificadores: | doi: 10.1007/s00190-020-01360-0 issn: 1432-1394 |
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