AUSPOS AUSPOS Online GPS Processing Online GPS Processing

ServiceServiceJohn Manning , John Dawson.Ramesh GovindJohn Manning , John Dawson.Ramesh Govind

Geoscience AustraliaGeoscience Australia

Australian Online GPS Processing Australian Online GPS Processing

Service (AUSPOSService (AUSPOS))

ConceptsConcepts• International GPS Service (IGS)International GPS Service (IGS)

• Australian Regional GPS Network (ARGN) Australian Regional GPS Network (ARGN)

• long baseline precise GPS Processinglong baseline precise GPS Processing

BackgroundBackground

• Geoscience Australia (GA) increasingly was Geoscience Australia (GA) increasingly was undertaking GPS processing in the ‘national interest’ undertaking GPS processing in the ‘national interest’ for :for :

- defense, government agencies, International- defense, government agencies, International obligations,…obligations,…

• International groups providing online GPSInternational groups providing online GPS processing services :processing services :

- ITRF coordinates only- ITRF coordinates only- potential for confusion in Australia, ie. GDA94 - potential for confusion in Australia, ie. GDA94 versus ITRFversus ITRF

• Internet based service logical extensionInternet based service logical extension to GA to GA servicesservices

• Internet web applicationInternet web application• users submit geodetic quality GPS via web-users submit geodetic quality GPS via web-

browserbrowser• rapid turn-around precise positions via emailrapid turn-around precise positions via email• cm level coordinates anywhere in the World!cm level coordinates anywhere in the World!• position quality depends on data quantity/qualityposition quality depends on data quantity/quality• local datum within Australia (GDA94)local datum within Australia (GDA94)• ITRF coordinates outside of Australia ITRF coordinates outside of Australia • FREE serviceFREE service

AUSPOSAUSPOS

Produces GDA and ITRF positions Produces GDA and ITRF positions as a free serviceas a free service

Preserves National datum using Preserves National datum using tectonic plate model back to 1 tectonic plate model back to 1 January 1994January 1994

Application is world wideApplication is world wide

Relative GPS Positioningcm level positioning with two receiversrequires existing ground geodetic infrastructure

Absolute GPS Positioningcm level positioning with one receivergeodetic infrastructure ‘invisible’ to the user

How it worksHow it works• International GPS Service (IGS)

• worldwide network of permanent GPS receivers• ‘baseline’ from three closest IGS GPS• station to station distances

• typically <1000 km, up to 3500 km

IGS

IGS

IGS

User GPS

Australian Regional GPS Network (ARGN)

International GPS Service (IGS) International GPS Service (IGS) NetworkNetwork

What do you Submit?What do you Submit?

• GPS data (RINEX)GPS data (RINEX)• Your email addressYour email address• the height of your GPS antennathe height of your GPS antenna• the type of your GPS antennathe type of your GPS antenna

}height

Speed and accuracySpeed and accuracy

• 6 hour data file• results delivered in ~ 3 minutes• 20 mm horizontal, 50 mm vertical

• 24 hour data file• results delivered in ~15 minutes• <10 mm horizontal and 10-20 mm vertical

UserUserGPS DataGPS Data

Processing ResultsProcessing ResultsCoordinates (emailCoordinates (email)

http://www.ga.gov.au

AUSPOS EmailAUSPOS Email

AUSPOS ReportAUSPOS Report

AUSPOS Australian UsersAUSPOS Australian Users

AUSPOS Global UsersAUSPOS Global Users

AUSPOS ApplicationsAUSPOS Applications•DGPS reference station positioning DGPS reference station positioning

Remote GPS station positioning Remote GPS station positioning

Ultra-long GPS baseline positioning Ultra-long GPS baseline positioning

GPS connections to IGS and ARGN stations GPS connections to IGS and ARGN stations

High accuracy vertical GPS positioning High accuracy vertical GPS positioning

In the field high-accuracy processing In the field high-accuracy processing

GPS network quality controlGPS network quality control

Internet ReferencesInternet References

GA home pageGA home page www.ga.gov.auwww.ga.gov.au

GA Geodesy home pageGA Geodesy home page www.auslig.gov.au/geodesy/newhome.htmwww.auslig.gov.au/geodesy/newhome.htm

AUSPOS home pageAUSPOS home page www.auslig.gov.au/geodesy/sgc/wwwgpswww.auslig.gov.au/geodesy/sgc/wwwgps

IGS home pageIGS home page igscb.jpl.nasa.govigscb.jpl.nasa.gov