The technology works using GNSS satellites alongside a geostationary communications satellite to broadcast the signals across the regions, as well as an uplink station, ground reference stations and a Ground Master station to communicate with the satellites from Earth, processing and correcting signals sent between the satellites.
But how does this technology differ from existing positioning services?
Geosciences Australia spokesperson Dominique Haraldson explains: “Google Maps is not a GPS service, but makes use of the information provided by the GPS satellite signal that is received by the location-enabled device (i.e. phone, in-car satellite navigation system, etc.). With SBAS, accurate positioning information can be received without the need for mobile phone or internet coverage.
“SBAS will transmit positioning data to users from a geostationary satellite, meaning anyone in Australia’s land and maritime zones will have access to more accurate (10 to 50 centimetre) and reliable positioning data.”
SBAS improves the reliability and accuracy of information carried through the GNSS by correcting signal measurement errors and providing information about the integrity, accuracy, availability and continuity of the signals.
Are there any limitations to the technology? Haraldson clarifies: “The signal can be degraded as it travels from the satellite to the receiving device. Limitations exist where the signal from the satellite is physically blocked, by dense canopy, tall buildings or if operated inside.
“This is no different to the current limitation of receiving a Global Navigation Satellite Signal, such as GPS.”