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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Impact and synergies of GIM error estimates on the VTEC interpolation and single-frequency PPP at low latitude region

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Author(s):
Jerez, Gabriel O. [1, 2, 3] ; Hernandez-Pajares, Manuel [2, 3] ; Goss, Andreas [4] ; da Silva, Crislaine Menezes [1] ; Alves, Daniele B. M. [1] ; Monico, Joao F. G. [1]
Total Authors: 6
Affiliation:
[1] Sao Paulo State Univ, UNESP, Dept Cartog, BR-19060900 Presidente Prudente, SP - Brazil
[2] Univ Politecn Catalunya UPC, UPC IonSAT, Dept Math, Barcelona 08034 - Spain
[3] Univ Politecn Catalunya UPC, UPC IEEC Res Grp, Dept Math, Barcelona 08034 - Spain
[4] Tech Univ Munich, Deutsch Geodat Forschungsinst, Arcisstr 21, D-80333 Munich - Germany
Total Affiliations: 4
Document type: Journal article
Source: GPS SOLUTIONS; v. 26, n. 2 APR 2022.
Web of Science Citations: 0
Abstract

The vertical total electron content (VTEC) is one of the key quantities to describe variations of the ionosphere and can be provided to users to correct the ionospheric disturbances for GNSS (Global Navigation Satellite System) positioning. The VTEC values and the corresponding standard deviations are routinely provided in the so-called Global Ionosphere Maps (GIM), with a typical time resolution of 2 h (and up to 15 min) on regular grids with 2.5o resolution in latitude and 5o resolution in longitude. To determine the ionospheric corrections from the GIMs for positioning applications, an interpolation has to be applied to the VTEC grid values, which generally degenerates the final VTEC accuracy. In this context, the typically applied bi-linear interpolation of the VTEC values is calculated by introducing a new weighting scheme by means of the standard deviation maps in the ionospheric domain. In the sequel, the impact of the use of the VTEC uncertainties for the interpolation procedure is applied to the GIMs of different centers and assessed in the ionospheric and in the positioning domain. For the assessment of the GIM in the ionospheric domain, the VTEC values calculated are compared with VTEC directly obtained from the given GIM, i.e., without interpolation. In the positioning domain, the impact of the VTEC uncertainties is analyzed by means of single-frequency precise point positioning (PPP), considering four Brazilian stations in challenging regions. The use of the standard deviation values in positioning provides a significant improvement in periods of high solar flux, especially for stations in the region under more intense ionospheric effect (mean rates of improvements up to 47%). (AU)

FAPESP's process: 17/50115-0 - GNSS technology for supporting air navigation
Grantee:Joao Francisco Galera Monico
Support Opportunities: Research Grants - Research in Public Policies
FAPESP's process: 21/05285-0 - New strategies for retrieving profiles from GNSS radio occultation data considering the Brazilian atmosphere
Grantee:Gabriel Oliveira Jerez
Support Opportunities: Scholarships in Brazil - Post-Doctoral