Satellite-based Augmentation System or SBAS  can augment standalone Global Navigation Satellite Systems such as GPS in a number of areas including accuracy, integrity, and availability.
It works by collecting raw positioning data from Continuously Operating Reference Stations (CORS) in the region, computing error corrections and disseminating these corrections to users from a geostationary communications satellite via an uplink ground station.
 
https://frontiersi.com.au/
Precise Positioning Outreach for Australia and New Zealand 
https://www.ga.gov.au/news-events/news/latest-news/pinpointing-the-uses-of-precise-positioning

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