GNSS allows users with compatible receiver devices to determine their position, velocity and local time by processing signals from satellites in point positions within space. GNSS signals are provided by satellite systems called core constellation systems. The current core constellation systems are USA’s Global Positioning System (GPS), Europe’s Galileo, Russia’s Global'naya Navigatsionnaya Sputnikovaya Sistema (GLONASS), and China’s Beidou. Technologies like Differential GNSS (DGNSS), Real-time Kinematics (RTK) and Precise Point Positioning (PPP) improve the accuracy of the core constellations while technologies such as Aircraft based Augmentation Systems (ABAS), Ground Based Augmentation Systems (GBAS) and Satellite Based Augmentation Systems (SBAS) in addition to improving accuracy provide integrity which is a measure of trust in the correctness of the information.

The use of GNSS Position, Navigation and Timing (PNT) information depends on operational requirements and encompasses different sectors from Aviation, Maritime, Road, Rail, Agriculture, consumer Location Based Services (LBS), and Geo-information to Timing and synchronization as well as Drones and Internet of Things (IoT) sectors.

SBAS complements GNSS system performance to improve its attributes such as accuracy, integrity, continuity, and availability enabling its use in various sectoral applications especially those with stringent operational requirements like the Safety of Life (SoL) applications in the Aviation sector, among others. Ultimately, the use of SBAS in these various sectoral applications provides enormous benefits including but not limited to improved productivity, the efficiency of operations, increased safety, and economic return on investment, among others.