Reference : Statistical study of ionospheric small-scale irregularities at mid-latitudes using GP...
Scientific congresses and symposiums : Unpublished conference
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/40345
Statistical study of ionospheric small-scale irregularities at mid-latitudes using GPS measurements
English
[fr] Étude statistique des irrégularités ionosphériques de petite échelle aux latitudes moyennes à l'aide de mesures GPS
Wautelet, Gilles mailto [Institut Royal Météorologique - IRM > Géophysique > > >]
Warnant, René mailto [Université de Liège - ULg > Département de géographie > Géodésie et positionnement par satellite >]
11-Jul-2007
No
No
International
IRI/COST 296 WORKSHOP
10 - 14 juillet 2007
Academy of Sciences of the Czech Republic - Institute of Atmospheric Physics - UFA
Prague
République Tchèque
[en] Ionosphere ; GPS ; Irregularities
[fr] Géodésie et GNSS
[en] At the present time, Global Navigation Satellite Systems (GNSS) allow to obtain a precision of a few centimeters in real time using positioning techniques like the so-called Real Time Kinematics (RTK). Nowadays, the ionosphere remains the most important error source affecting such GNSS applications. Indeed, the presence of small-scale irregular structures in the Total Electron Content (TEC) can strongly affect the reliability and the precision of high precision real time positioning applications. Those small-scale structures can have several origins: Traveling Ionospheric Disturbances, "noise-like" variability in TEC, scintillations. The Royal Meteorological Institute of Belgium (RMI) has developed a software which allows to monitor the TEC using GPS measurements (at one station). The software can also be used to detect small-scale irregularities in TEC by monitoring TEC temporal gradients (i.e. rate of change). The RMI has applied this software to the GPS data collected at Brussels from April 1993 up to now what represents a period of more than a Solar Cycle. The results obtained from this GPS-TEC software will be presented. First, the paper analyzes the different types of small-scale structures which have been observed in TEC. Then, a statistical study of those ionospheric irregularities is presented; we shall analyze their probability of occurrence and their amplitude (in TECU/min) depending on daytime, season, solar activity, geomagnetic activity... The results of our study which is financed by the GNSS Supervising Authority will allow to have a better understanding of the usual case/worst case conditions encountered in high precision positioning applications based on GNSS.
Royal Meteorological Institute of Belgium
Researchers ; Professionals
http://hdl.handle.net/2268/40345

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