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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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Presentation on theme: "AUSLIG Online GPS Processing Service (AUSPOS) John Dawson, Ramesh Govind, John Manning Concepts – AUSPOS Background – How it works."— Presentation transcript:

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

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

3 GPS data via Internet New Survey MarksLocal Survey Mark STEP 1

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 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 User GPS

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

19

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


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