Performance Evaluation of Galileo HAS SIS and IDD Channels During the Initial Service Phase

Many industrial and scientific applications rely on high accuracy positioning. With the advancements of modern Global Navigation Satellite Systems constellations and the release of new services, access to a real-time high-accuracy positioning anywhere in the world is a reality. To enable real-time precise point positioning, Galileo High Accuracy Service (HAS) offers corrections without needing any additional infrastructures on the user side. In this article, we compare the user positioning performance obtained with HAS corrections received via Internet Data Dissemination and Signal-In-Space using the software JRC User Navigation Engine, which implement the Galileo HAS reference user algorithm developed at the Joint Research Centre. The comparison is carried out using stations of the International GNSS Service located throughout the world, using data acquired since the start of the initial service phase (January 2023). The goal of the article is to evaluate the achievable performance using the different HAS corrections, by reviewing the performance evolution of HAS since the beginning of the initial service phase, and determining the impact on the user performances.