Distributed Integrity Monitoring

The objective of the activity is to elaborate at System level the concept of distributing integrity amongst Ground, Space, and User Segments. The Space Segment monitors refer to a safety-of-life (SoL) on-board integrity determination unit (IDU), while the User Segment monitor refers to an advanced receiver autonomous integrity monitoring unit (V-ARAIM) within the avionics.

Current single-frequency Satellite Based Augmentation Systems (SBAS) and planned dual-frequency multi-constellation (DFMC) SBAS systems enable approach operations with vertical guidance with time to alarm (TTA) of 6 seconds, but do not support auto land operations with decision height (DH) much less than 200 feet, and time to alarm down to 1-2 seconds . These critical TTA requirements cannot be met by having all integrity monitors centralized at the Ground Segment. Therefore, there is a need to distribute the integrity monitors amongst different Ground, Space and User Segments. The activity is structured in the following tasks: 1. System Function Specification Consolidation. 2. System Function Preliminary Design. 3. System Function Detailed Design. 4. Ground-Segment Monitor Design Performance Assessment. 5. Space-Segment Monitor Design Performance Assessment. 6. User-Segment Monitors Design Performance Assessment. The activity will provide inputs for the safety of life requirements within the European GNSS programmes.