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

2. STEP 1
Local Survey Mark
Geodetic Survey Mark
STEP 2
New Survey Marks
Local Survey Mark

3. STEP 1
GPS data via Internet
New Survey Marks
Local Survey Mark

4. What is AUSPOS? Internet web application
users submit geodetic quality GPS via web-browser
rapid turn-around precise positions via
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

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

6. User
GPS Data
Processing Results
Coordinates ( )

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

8. 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

9. 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

10. International GPS Service (IGS) Permanent GPS

11. 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

12. AUSPOS Accuracy versus Observation Length

13. 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

14. AUSPOS Australian Users

15. AUSPOS Global Users

16. 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

17. AUSPOS

18. AUSPOS Report

20. Useful Internet GPS Resources
AUSLIG home page 
AUSLIG Geodesy home page 
AUSPOS home page 
IGS home page
 igscb.jpl.nasa.gov