IGS Workshop 2024 - Attila KOMJATHY

GDGPS High Accuracy Products for Real-Time GNSS Applications: Supporting Public and Scientific Communities

The Near Earth Tracking Systems Group at NASA's Jet Propulsion Laboratory is committed to broadening the accessibility of the Global Differential Global Positioning System (GDGPS) outputs, which have been meticulously engineered at JPL since 2000. Through the utilization of GDGPS System – High Accuracy Service (HAS) corrections, we aim to elevate GPS user accuracies from several meters to decimeter or even sub-decimeter levels.

We have started disseminating high accuracy products over the internet, leveraging NASA's CDDIS casters, to serve both the general public and scientific users, including those who rely on products from the International GNSS Service (IGS). The current GDGPS System operates by collecting streaming 1-Hz real-time data from over 100 high-quality GNSS ground stations. It then computes precise differential corrections for multi-constellation orbits and clocks, incorporating ancillary parameters, and distributes these corrections to US governmental and commercial users via the internet.

These differential corrections, applicable to both GPS and Galileo systems are now openly accessible to global users in real-time streaming formats such as RTCM-3 and IGS SSR. This accessibility will significantly enhance real-time positioning capabilities, empowering users to improve applications ranging from mobile phone positioning accuracy to natural hazard detection. Pending funding availability, the GDGPS high accuracy products will continue to be made available via NASA servers facilitating public access and utilization.