Abstract
AUSPOS is an openly available online Global Positioning System (GPS) data processing service provided by Geoscience Australia and is recommended by the Intergovernmental Committee on Surveying and Mapping (ICSM) for control surveys by Global Navigation Satellite System (GNSS) in the Australian region as a method for providing connection to the Geocentric Datum of Australia 2020 (GDA2020). A new and improved global reference frame, the International Terrestrial Reference Frame 2020 (ITRF2020), was released in April 2022 by the International Earth Rotation and Reference Systems Service (IERS), which was followed by the International GNSS Service (IGS) realisation, using modernised analysis standards and processing strategies, called IGS20. This paper outlines the adoption of ITRF2020/IGS20 for the AUSPOS processing service, which includes the introduction of a two-step transformation strategy to provide access to the national datum, GDA2020. The paper also provides relevant analysis and validation of the new AUSPOS system’s (v3.0) ability to produce consistent GDA2020 coordinates when compared to those produced by the previous AUSPOS system (v2.4 - aligned to ITRF2014) with observed differences of $$\:-0.2\pm\:6mm,\:-0.2\pm\:4mm\:and-0.3\pm\:21mm$$ in Easting, Northing and Height components, respectively. Geoscience Australia is committed to being Australia’s trusted provider of analytic products and services, by enhancing the accuracy and reliability of positioning within Australia.