AUSPOS Online GPS Processing Service John Manning, John Dawson.Ramesh Govind Geoscience Australia

Australian Online GPS Processing Service (AUSPOS ) Concepts International GPS Service (IGS) International GPS Service (IGS) Australian Regional GPS Network (ARGN) Australian Regional GPS Network (ARGN) long baseline precise GPS Processing long baseline precise GPS Processing

Background Geoscience Australia (GA) increasingly was undertaking GPS processing in the ‘national interest’ for : Geoscience Australia (GA) increasingly was undertaking GPS processing in the ‘national interest’ for : - defense, government agencies, International obligations,… obligations,… International groups providing online GPS International groups providing online GPS processing services : processing services : - ITRF coordinates only - potential for confusion in Australia, ie. GDA94 versus ITRF Internet based service logical extension to GA Internet based service logical extension to GA services services

Internet web application users submit geodetic quality GPS via web- users submit geodetic quality GPS via web- browser browser rapid turn-around precise positions via rapid turn-around precise positions via cm level coordinates anywhere in the World! cm level coordinates anywhere in the World! position quality depends on data quantity/quality position 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 service FREE service

AUSPOS n Produces GDA and ITRF positions as a free service n Preserves National datum using tectonic plate model back to 1 January 1994 n Application is world wide

Relative GPS Positioning cm level positioning with two receivers requires existing ground geodetic infrastructure

Absolute GPS Positioning cm level positioning with one receiver geodetic infrastructure ‘invisible’ to the user

How 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 User GPS

Australian Regional GPS Network (ARGN)

International GPS Service (IGS) Network

What do you Submit? GPS data (RINEX) Your address Your address the height of your GPS antenna the height of your GPS antenna the type of your GPS antenna the type of your GPS antenna } height

Speed 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 mm vertical

User GPS Data Processing Results Coordinates ( Coordinates ( )

AUSPOS

AUSPOS Report

AUSPOS Australian Users

AUSPOS Global Users

AUSPOS Applications DGPS reference station positioningDGPS reference station positioning  Remote GPS station positioning  Ultra-long GPS baseline positioning  GPS connections to IGS and ARGN stations  High accuracy vertical GPS positioning  In the field high-accuracy processing  GPS network quality control

Internet References GA home page   GA Geodesy home page   AUSPOS home page   IGS home page  igscb.jpl.nasa.gov  igscb.jpl.nasa.gov