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TitleGPS ionospheric mapping at Natural Resources Canada
AuthorGhoddousi-Fard, R
SourceIGS Workshop 2014, posters; 2014, 1 sheet
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20140357
MeetingIGS Workshop 2014; Pasadena; US; June 23-27, 2014
Mediaon-line; digital
File formatpdf
Subjectsgeophysics; remote sensing; geomagnetic fields; geomagnetism; computer mapping; mapping techniques; global positioning system
Illustrationsplots; histograms; schematic diagrams; flow charts
ProgramGeodetic Survey, Canadian Spatial Reference System
AbstractCanadian Geodetic Survey of Natural Resources Canada (NRCan) has developed a number of products from GPS sensing of the ionosphere. These include : 1) regional near - real -time and daily vertical Total Electron Content (TEC) maps represented using Spherical Cap Harmonic Analysis that covers Canada and adjacent regions , 2) near - real - time global TEC maps from GPS Real Time (RT) IGS stations represented using Spherical Harmonic (SH) coefficients of degree and order 15 which are also available in 96 daily IONosphere map EXchange (IONEX) format, and 3) daily global TEC maps from around 350 GPS stations which are represented using SH coefficients of degree and order 15 and are also available in IONEX format. In addition, as a by - product of regional and global TEC mapping processes, GPS satellites and receiver differential code biases (DCB) are estimated daily and in the form of weekly moving averages. These include P1P2, P1C1 and P2C2 DCBs from all processed receiver types as well as receiver - model specific estimates. As a by - product of near - real - time global TEC mapping from high rate RT - IGS GPS stations, dual - frequency phase rate measurements are used to derive proxy indices for monitoring the ionospheric irregularities. Schematic regional and global maps of such indices are updated in near - real - time and are being studied to correlate with independent space weather indices. Higher order ionospheric delays are also being estimated in near - real - time and are stored for studies on their amount and spatial variations.
Summary(Plain Language Summary, not published)
This presentation describes a strategy implemented at NRCan to estimate ionospheric total electron content (TEC) and create national and global TEC density maps. The strategy exploits the use of GPS signal delays observed from networks of continuously operating ground-based GPS tracking stations. The potential for such maps to complement other data sources for space weather research and developments are discussed. Improving space weather monitoring and forecasting is key to robust satellite communications and reliable GPS positioning.