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M. Gende1,2, C. Brunini1,2, F. Azpilicueta1,2
Universidad Nacional de La Plata, Argentina1
CONICET, Argentina 2
La Plata Ionospheric Model as La Plata Ionospheric Model as a tool for scientific and a tool for scientific and
technological applicationstechnological applications
2nd LISN Workshop. São José dos Campos. November 2011
OutlookOutlook
LPIM modelSIRGAS-IONNear real time dataLISN Project in ArgentinaConclusions and future work
2nd LISN Workshop. São José dos Campos. November 2011
• Empirical
• Meteorological
• Total electron content– Global– Regional– Local
LPIM modelLPIM model
2nd LISN Workshop. São José dos Campos. November 2011
• Ground GPS receivers (CORS)
• LEO GPS receivers
• Topex and Jason
DataData
2nd LISN Workshop. São José dos Campos. November 2011
ObservableObservable
• Dual frequency zero difference (RINEX)
• L band
2
-40.3STEC = dsN
f
2nd LISN Workshop. São José dos Campos. November 2011
ObservableObservable
• Even for the same satellite, two different arcs are generally affected by different levelling errors.
• IFB can be affected by significant intra-day variations.• Levelling errors: 1.4 - 5.3 TECUs
• Ciraolo L. et al. Calibration errors on experimental slant total electron content determined with GPS. Journal of Geodesy, Springer, (81) 2, 111-120, DOI: 10.1007/s00190-006-0093-1, 2007.
4 STEC + + arcL
4 1 2 =STEC + B + B + N +srL L L
2nd LISN Workshop. São José dos Campos. November 2011
2D modelling2D modelling
1
cos '
STEC
VTEC z
0 0
( , ) cos 2 sin 2 (sin )24 24
lL
lm ml lml m
mh mhVTEC h a b P
2nd LISN Workshop. São José dos Campos. November 2011
MODIPMODIP
• A new coordinate for modelling the F2-layer and the top-side ionosphere. Rawer (1984)tan
cos
I
2nd LISN Workshop. São José dos Campos. November 2011
CODE UPC LPIM
• Azpilicueta F. et al. Global ionospheric maps from GPS observations using modip latitude’. Advances in Space Research, DOI: jasr-d-04-01245, 2006.
• Gende, M. et al. Inter comparison of total electron content maps for the South American region, in International Union of Geodesy and Geophysics. 2007: Perugia, Italia.
Global modelGlobal model
2nd LISN Workshop. São José dos Campos. November 2011
SIRGASSIRGAS
• Starts as a geodetic project• Now is also producing atmospheric
products– Regional TEC maps– Water vapor estimations
• Can share with LISN CORS GNSS data• Generally not in real time• http://www.sirgas.org/
2nd LISN Workshop. São José dos Campos. November 2011
http://cplat.fcaglp.unlp.edu.arhttp://cplat.fcaglp.unlp.edu.ar
2nd LISN Workshop. São José dos Campos. November 2011
2nd LISN Workshop. São José dos Campos. November 2011
2nd LISN Workshop. São José dos Campos. November 2011
Tool to study climatologic conditionsTool to study climatologic conditions
• Mosert, M. et al. Comparing IRI TEC prediction to GPS and digisond measurements at Ebro. Advances in Space Research, 2007. 39(5): p. 841-847.
2nd LISN Workshop. São José dos Campos. November 2011
Tool to study disturbed conditionsTool to study disturbed conditions
• Sahai, Y. et al. Effects observed in the Latin American sector ionospheric F region during the intense geomagnetic disturbances in the early part of November 2004. Journal of Geophysical Research (Space Physics), 2009. 113(doi:10.1029/2007JA013007): p. 11.
2nd LISN Workshop. São José dos Campos. November 2011
Applications in GNSS navigationApplications in GNSS navigation
• Gende, M. et al., Ionospheric biases correction for coordinates derived from GPS single point positioning. Annals Of Geophysics, 2005. 48(3): p. 439-444.
• Brunini, C. et al., Ionospheric Effects on Satellite Based Augmentation Systems (SBAS); WAAS, EGNOS, GAGAN, MSAS and future systems. in Bacon Satellite Symposium. 2004. Trieste, Italia.
2nd LISN Workshop. São José dos Campos. November 2011
Applications in geodetic Applications in geodetic
positioningpositioning
• Gende, M. et al. An ionospheric delay estimation technique to improve large baseline L1 differential positioning. in Dynamic Planet. IAG/IAPSO/IABO Joint Assembly. 2005. Cairns, Australia.
2nd LISN Workshop. São José dos Campos. November 2011
Near real time VTECNear real time VTEC
• Stations with permanent Internet access.
• Five minutes double compress RINEX files (30 seconds interval rate).
• Download central server using rsync.• Process with a delay of 5 minutes.• Run LPIM in local mode.• NTRIP is not implemented yet.
2nd LISN Workshop. São José dos Campos. November 2011
CorrientesCorrientes
2nd LISN Workshop. São José dos Campos. November 2011
Ingesting TOPEX dataIngesting TOPEX data
• Bibbo, I., et al., Global vTEC Maps and instrumental DCB based on Combined GPS and TOPEX/Jason Measurements, in Coupling, Energetics, and Dynamics of Atmospheric Regions (CEDAR) workshop 2010. 2010: University of Colorado, Boulder, USA.
TPvTECvTECLPIM_GPSvTECLPIM_GPS+TP
2nd LISN Workshop. São José dos Campos. November 2011
3 D Modelling3 D Modelling
• Brunini, C. et al. Toward a SIRGAS service for mapping the ionosphere’s electron density distribution. in Geodesy for Planet Earth. 2010. Buenos Aires: International Association of Geodesy.
2nd LISN Workshop. São José dos Campos. November 2011
The actual state of the The actual state of the Argentinean component of Argentinean component of
the LISN projectthe LISN project
2nd LISN Workshop. São José dos Campos. November 2011
2nd LISN Workshop. São José dos Campos. November 2011
ProblemsProblemsIntranet. No public and fix IP.Internet interruptions.Hard drives full.Very low bandwidth.Can not use the data for geodetic
purpose.
2nd LISN Workshop. São José dos Campos. November 2011
Conclusions and future Conclusions and future worksworks
LPIM has more than a decade working as a tool for ionospheric studies
Is evolving towards a 4D modelMore physical equations are being
implemented in the program.More data are being assimilating (TOPEX-
JASON, LEO,…)Modifications must be done so the program
works as a filter and accepts NTRIP data
2nd LISN Workshop. São José dos Campos. November 2011
2nd LISN Workshop. São José dos Campos. November 2011
2nd LISN Workshop. São José dos Campos. November 2011
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