AUSLIG Online GPS Processing Service (AUSPOS)

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• AUSLIG Online GPS Processing Service (AUSPOS)
• John Dawson, Ramesh Govind, John Manning
• Concepts
• AUSPOS Background
• How it works

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STEP 1
Local Survey Mark
Geodetic Survey Mark
STEP 2
New Survey Marks
Local Survey Mark
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STEP 1
www.auslig.gov.au
GPS data via Internet
New Survey Marks
Local Survey Mark
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• What is AUSPOS?
• Internet web application
• users submit geodetic quality GPS via
  web-browser
• rapid turn-around precise positions via email
• cm level coordinates anywhere in the World!
• including Antarctica
• position quality depends on data
  quantity/quality
• local datum within Australia (GDA94)
• ITRF coordinates outside of Australia
• FREE service

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• What do you Need?
• GPS data
• dual frequency data
• gt 6 hrs of continuous
• Internet web browser
• i.e. netscape, Internet Explorer
• Email address

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User GPS Data
Processing Results Coordinates (email)
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• What do you Submit?
• GPS data (RINEX)
• Your email address
• the height of your GPS antenna
• the type of your GPS antenna

height
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• 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
• lt10 mm horizontal and 10-20 mm vertical

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• How it works
• International GPS Service (IGS)
• worldwide network of permanent GPS receivers
• baseline from three closest GPS
• station to station distances
• Antarctica -- typically 1000 km to 3500 km

IGS
IGS
User GPS
IGS
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International GPS Service (IGS) Permanent GPS
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• AUSPOS, GPS Errors and Models
• state-of-the-art processing system (MicroCosm)
• ?IERS96 conventions
• orbit error
• ?uses IGS precise orbits
• receiver and satellite clock error
• ?eliminated by double difference
• troposphere refraction
• ? scale factor estimated
• ionospheric refraction
• ? dual frequency observations
• antenna phase centre variations
• ? uses IGS phase centre models

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AUSPOS Accuracy versus Observation Length
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• AUSPOS Applications
• DGPS 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

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AUSPOS Australian Users
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AUSPOS Global Users
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• AUSPOS Applications in the Antarctic
• provides access to high-accuracy GPS processing
• free and easy to use
• high level ITRF geodetic control
• remote Antarctic locations
• single GPS receiver

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AUSPOS Email
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AUSPOS Report
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Useful Internet GPS Resources AUSLIG home page
? www.auslig.gov.au AUSLIG Geodesy home page ?
www.auslig.gov.au/geodesy/newhome.htm AUSPOS
home page ? www.auslig.gov.au/geodesy/sgc/wwwgps/
wwwgps.htm IGS home page ? igscb.jpl.nasa.gov