STATEFIX

THE WEST AUSTRALIAN HIGH PRECISION GPS NETWORK

The densification of GPS control networks thoughout the Australian continent has been ongoing since the establishment of the Australian Fiducial Network (AFN). The AFN forms the fundamental framework for the Geocentric Datum of Australia (GDA) and was coordinated during the 1992 IGS campaign. It consists of eight geologically stable marks at sites across Australia.. The AFN was densified into the Australian National Network (ANN) in 1993 (with some additional observations in 1992 and 1994). The ANN consists of seventy eight stations at approximately 500 km intervals across Australia. It has an estimated accuracy of 5cm at 95% confidence.

The STATEFIX project, commissioned and managed by the West Australian Department of Land Administration, represents the densification of the Australian National Network in West Australia to approximately 200km. Some 198 dual frequency baselines (mean baseline length 202km) were observed between March and November 1996. Data processing and multi-baseline network adjustment were undertaken at Curtin University of Technology using an in-house data processing package SWAG (South West Australian GPS Software).  Baseline lengths range from as short as 45km to distances of longer than 450km. Baselines of less than 250km in length were observed for a minimum of 12 hours, baselines longer than 250km in length were observed for a minimum of 16 hours. The observation interval was 30 seconds for all baselines.

For more detail see  Stewart et al (1997) (pdf format)  for which you will require  Adobe Acrobat -

Related papers:  
All papers below can be downloaded in pdf format

THE APPLICATION OF ANTENNA PHASE CENTRE MODELS TO THE WEST AUSTRALIAN STATE GPS NETWORK
Geomatics Research Australasia, No. 68, pp. 61-78.

POSSIBLE EVIDENCE FOR DISTORTIONS IN THE AUSTRALIAN HEIGHT DATUM IN WESTERN AUSTRALIA
Geomatics Research Australasia, no. 68, pp 1-12.

HOW ACCURATE IS THE AUSTRALIAN NATIONAL GPS NETWORK AS A FRAMEWORK FOR GPS HEIGHTING?
The Australian Surveyor, vol 43, 1:53:61.