Geoscience Australia (GA) manages a network of 150 Continuously Operating Reference Stations (CORS) across Australia, Antarctica and the Pacific. In addition, GA supports data archiving and distribution of a further 450 CORS that contribute to the Asia-Pacific Reference Frame (APREF) project. The primary objectives of this network have been to maintain the National Geodetic Reference System and support scientific endeavours. GA is currently shifting the focus of our GNSS networks from a scientific model to one which supports both science and industry. This requires GA to meet higher standards of data availability and accessibility, latency and metadata accuracy. Further to this GA recognises the need to take advantage of Australia¿s unique geographical location and move towards providing access to multi-GNSS data in modern formats such as RINEX 3 and RTCM 3.2 (MSM). This presentation looks at the current state of the Australian CORS network and highlights our planned transition and expected challenges in moving from a scientific model to an operational model supporting modern data format and streamlined metadata.

An application dated 20 August 2012 for verification of a reference standard of measurement under Regulation 12 of the National Measurement Regulations 1999 was received from the Ultimate Positioning Group Pty Ltd for verification of GDA94 position on their owned or managed station monuments. This report documents the processing and analysis of GPS data observed by the Ultimate Positioning Group Pty Ltd during three 7-day periods from 6 to 12 May 2012 (day of year 127 to 133) for the station STHE, from 13 to 19 May 2012 (day of year 134 to 140) for the station DELO and from 22 to 28 July (day of year 204 to 210) for seven stations BTYP, BURN, CAMP, DEVO, LAUN, RANE and SCOT, to satisfy the position verification requirements.

Data collected from the Australian Regional Global Navigation Satellite System (GNSS) network, AuScope network and other GNSS observatories located around the world over the last 15 years.

This collection includes Global Navigation Satellite System (GNSS) observations from long-term continuous or semi continuous reference stations at multiple locations across Australia and its external territories, including the Australian Antarctic Territory. <b>Value:</b> The datasets within this collection are provided on an openly accessible basis to support a myriad of scientific and societal positioning applications in Australia. These include the development and maintenance of the Australian Geospatial Reference System (AGRS); the densification of the International Terrestrial Reference Frame (ITRF); crustal deformation studies; atmospheric studies; and the delivery of precise positioning services to Australian businesses. <b>Scope: </b> Data from reference stations across Australia and its external territories, including the Australian Antarctica Territory. <b>Access: </b> To access the datasets and query station information visit the <a href="https://gnss.ga.gov.au./">Global Navigation Satellite System Data Centre</a>

This GA Record reports findings regarding the absolute vertical rate of movement (i.e. the rate at which the land is moving up or down with respect to the centre of the Earth) of 13 Pacific Island tide gauges over the period 2003 – 2018 based on the analysis of Global Navigation Satellite System (GNSS) data and levelling data.

Geoscience Australia (GA) designed two types of Global Navigation Satellite Systems (GNSS) antenna mount adaptors which allow antenna north reference marks to be easily and reliably aligned to the true north without changing the height of the antenna with respect to the reference mark. The antenna adaptors evaluated are proposed to be installed on GNSS Continuously Operating Reference Station (CORS) across Australia as new sites are built and commissioned or existing sites upgraded. The purpose of the report is to document the antenna adaptor testing experiments undertaken between 15/09/2021 and 18/10/2021, and determine if the mount adaptors have a significant impact on positioning quality when installed with GNSS antennas on typical GA CORS pillars. Specifically, the mount adaptors were evaluated for their effect on site multipath, position difference, and antenna calibration phase centre variations (PCV) models. Two types of mount adaptors were evaluated, a small adaptor with a diameter of 60 mm and a thickness of 26 mm and a large adaptor with a diameter of 100 mm and a thickness of 26 mm. Both adaptors were fabricated using solid stainless steel. After analysis of observations collected on typical GA tall (~1.5 m) and short (< ~0.2 m) pillars, with and without the adaptors installed, the following conclusions and recommendations can be made: a) The impact of the two types of antenna mount adaptors is small, causing less than 0.02 m change in average multipath based on one week data for L1 and L2 frequencies. b) There is around 1.1 mm for the tall pillar and 2.5 mm for the short pillar change in average position difference induced by the two types of adaptors for both horizontal and vertical components based on one week data. c) There is no significant impact (less than 1 mm for both L1 and L2 frequencies) on the PCV models induced by small antenna adaptor. d) The small antenna mount adaptor is recommended for tall pillar installations and the large mount adaptor is recommended for short pillar applications.

A series of short video clips describing how data positions us for the future, consisting of the following titles: How data positions us for the future: Bush fire response A short video showing how the national positioning infrastructure managed by Geoscience Australia underpins the work of hazard management professionals. How data positions us for the future: Precision agriculture A short video showing how the national positioning infrastructure managed by Geoscience Australia underpins the work of the agricultural industry. How data positions us for the future: Urban navigation A short video showing how the national positioning infrastructure managed by Geoscience Australia underpins the everyday life of Australians. Detailed production information: Concept development: Catherine Edwardson, Bobby Cerini, Julie Silec, Michael O'Rourke, Neil Caldwell, Simon. Costello, John Dawson Production management: Bobby Cerini, Julie Silec Video production: Julie Silec, Michael O'Rourke, Neil Caldwell Videography: Bobby Cerini; Rural Fires Service NSW; stock imagery also used

AUSPOS is Geoscience Australia's on-line static GPS positioning service, providing user access to a state-of-art analysis system via a simple web-interface. Since its launch in 2001, AUSPOS has continued to be a widely used tool for the online processing of geodetic GPS data for surveying, mapping, geodetic, geophysical, hydrographical, mining, construction, military and other applications. On 20 March 2011, Geoscience Australia released an upgraded version of the service. The upgraded AUSPOS implements recent advances in analysis software and strategies, the reference frame ITRF2008, AusGeoid09 and the latest transformation parameters between ITRF2008 and GDA94. AUSPOS now delivers precise ITRF2008 coordinates to users within 3-5 minutes while continuing to provide Australian users with access to GDA94 coordinates and derived AHD heights to the highest achievable accuracy by simultaneously processing up to 7 consecutive days of user-supplied GPS data collected from up to 20 sites. The upgraded AUSPOS also provides more realistic coordinate uncertainty of its solutions using a recently developed assessment method of coordinate uncertainty. The assessment method is based on the duration of a data set and the density of reference station network.

We are pleased to announce the forthcoming release of Ginan version 3, a suite of open-source Global Navigation Satellite System (GNSS) software tools developed and maintained by Geoscience Australia in collaboration with industry and academia under the Positioning Australia program. Ginan serves as a precise point positioning (PPP) engine to produce real-time products that support high-precision positioning. Its versatility is demonstrated through its applicability to various geodetic and positioning activities, including computation of daily coordinate solutions, precise satellite orbit determination, computation of satellite clocks and biases, atmospheric modeling, and data quality assurance and quality control. These products effectively mitigate real-time errors associated with GNSS observations and are openly accessible as a centimeter-accurate correction service. The primary objectives of Ginan are: (1) showcase Australia's unique modelling and analytic systems for multi-GNSS real-time processing, delivering precise positioning products to both the Australian and international Positioning, Navigation, and Timing (PNT) community; (2) offer expert advice on navigation system performance over Australia; and (3) provide state-of-the-art GNSS analysis center software to universities and research organizations, thus fostering Australia's leadership in geospatial technology development. In this presentation, we will provide an overview of Ginan version 3, highlighting its new features, the current development status, and the strategic roadmap for its continued use as an operational service. We will provide examples of Ginan’s usefulness as a platform for research and innovation including its use as the processing engine for research into atmospheric anomalies from the Tonga volcano eruption through monitoring travelling ionospheric disturbances that could be used as early warning and tsunamigenic predictors for disaster risk and reduction; and observations of the Turkyia earthquake. The release of Ginan version 3 marks a significant advancement in GNSS data processing and positioning capabilities, contributing to the broader scientific community's understanding and utilization of geospatial technology. Abstract to be submitted to/presented at the American Geophysical Union (AGU) Fall Meeting 2023 (AGU23) - https://www.agu.org/fall-meeting

This collection includes Global Navigation Satellite System (GNSS) observations from short-term occupations at multiple locations across Australia and its external territories, including the Australian Antarctic Territory. <b>Value: </b> The datasets within this collection are available to support a myriad of scientific applications, including research into the crustal deformation of the Australian continent. <b>Scope: </b> Data from selected areas of interest across Australia and its external territories, including the Australian Antarctic Territory. Over time there has been a focus on areas with increased risk of seismic activity or areas with observed natural or anthropogenic deformation. <b>Access: </b> The datasets within this collection are currently stored offline, to access please send a request to gnss@ga.gov.au