M. Gende 1,2 , C. Brunini 1,2 , F. Azpilicueta 1,2 Universidad Nacional de La Plata, Argentina 1

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


• Empirical

• Meteorological

• Total electron content– Global– Regional– Local

LPIM modelLPIM model


• Ground GPS receivers (CORS)

• LEO GPS receivers

• Topex and Jason

DataData


ObservableObservable

• Dual frequency zero difference (RINEX)

• L band2

-40.3STEC = dsNf


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


2D modelling2D modelling

1cos '

STECVTEC z

0 0

( , ) cos 2 sin 2 (sin )24 24

lL

lm ml lml m

mh mhVTEC h a b P


MODIPMODIP

• A new coordinate for modelling the F2-layer and the top-side ionosphere. Rawer (1984)tan

cosI


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


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/


http://cplat.fcaglp.unlp.edu.arhttp://cplat.fcaglp.unlp.edu.ar


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.


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.


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.


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.


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.


CorrientesCorrientes


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


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.


The actual state of the The actual state of the Argentinean component of Argentinean component of

the LISN projectthe LISN project


ProblemsProblemsIntranet. No public and fix IP.Internet interruptions.Hard drives full.Very low bandwidth.Can not use the data for geodetic

purpose.


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

M. Gende 1,2 , C. Brunini 1,2 , F. Azpilicueta 1,2 Universidad Nacional de La Plata, Argentina 1

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