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TitleHigher order ionospheric effects during geomagnetic storms: impact on GNSS satellites orbit and clock estimation
AuthorGhoddousi-Fard, R
Source7th International Colloquium on Scientific and Fundamental Aspects of GNSS, programme; 2019 p. 1 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20180467
PublisherEuropean Space Agency
Meeting7th International Colloquium on Scientific and Fundamental Aspects of GNSS; Zürich; CH; September 4-6, 2019
DocumentWeb site
Mediaon-line; digital
File formathtml; pdf (Adobe® Reader®)
Subjectsgeophysics; extraterrestrial geology; geomagnetism; geomagnetic fields; geomagnetic variations; ionosphere; geodesy; satellite geodesy; navigation satellites; ionosphere; models; global navigation satellite systems (GNSS)
ProgramGeodetic Survey Canadian Spatial Reference System
Released2019 09 01
AbstractHigher order ionospheric effects, which can not be eliminated through a combination of dual-frequency GNSS observables, can be significant for high precision positioning applications during geomagnetic storm periods, especially satellite orbit and clock estimation from global GNSS network data. The largest part of higher order effects, the 2nd order, is estimated using slant total electron content (TEC) and modeled geomagnetic field components at the ionospheric pierce points. Estimation errors of the slant TEC and modeling errors of the geomagnetic field can induce large errors during severe space weather conditions.
There have been a number of studies on the characteristics of higher order ionospheric effects. Although insignificant during low solar activity periods, their effects are systematic with respect to Earth's North and South hemispheres. A few studies have also shown the impact on high precision positioning applications. At the Canadian Geodetic Survey of NRCan, higher order effects are regularly estimated and monitored at ionospheric pierce points observed by more than 350 globally distributed GNSS stations. They are also accounted for in its GNSS satellite orbit and clock products generation. In this presentation, impacts of higher order effects on satellite orbit and clock estimation are analyzed during geomagnetic storm periods.
Summary(Plain Language Summary, not published)
The part of ionospheric error that can not be eliminated using two frequency GNSS observations are referred to as higher order effects. These are being regularly estimated at the Canadian Geodetic Survey. In this presentation, they are studied in the estimation of satellite orbit and clock parameters to improve high precision positioning applications of GNSS.

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