In the next two years the Australian Government will invest $12 million in testing a satellite-based augmentation systems (SBAS).

Usually GNSS systems offer an accuracy from 5 to 10 meters, with SBAS infrastructure a 2D-Position accuracy of less than 5 centimeters can be achieved.

SBAS systems follow a similar layout of GNSS systems, consisting of:

• Ground Segment: Reference Stations, Processing Centers, Communication Network
• Space Segment: Geostationary Satellites (e.g. EGNOS uses Inmarsat)
• User Segment: Receivers and Antennas

The following errors are calculated and compensated

• Ionospheric Error
• Satellite timing errors
• Satellite orbit errors

The correction signal is transmitted from a geostationary satellite using the same frequency as GPS (L-band). This allows the user segment to use the same receiver and Antenna for SBAS.