Test of Galileo HAS in Precise Maritime Survey

Nowadays GNSS (Global Navigation Satellite System) plays a fundamental role in various fields such as agriculture, geodetic survey and maritime, air and land navigation. These application fields require different levels of accuracy and precision, leading massive scientific research to deploy dedicated services to satisfy the user requirements. One of the services that attracted the scientific community is the Galileo High Accuracy Service (HAS), that allows to achieve decimeter-level accuracy in real time positioning applications by disseminating orbit, clock, and bias corrections. This study aims to evaluate the grade of accuracy of Galileo HAS in Precise Point Positioning (PPP) mode during a maritime survey, considering only the GPS constellation in kinematic processing mode. The implemented model exploits dual frequency data to create the ionosphere-free linear combination to mitigate the first-order ionospheric delay. Decimeter-level accuracy of the navigation solution has been obtained.