ABSTRACT:The GNSS environment is experiencing two major changes: the introduction of a new civil signal in the L5 band and the launch of new GNSS constellations. These improvements could enable worldwide vertical guidance using Advanced Receiver Autonomous Integrity Monitoring (ARAIM). Before ARAIM can be implemented, it will be necessary to develop a common understanding across service providers of the navigation requirements, the threat model, the airborne algorithm, and the role of ground monitoring. We outline a concept for the provision of integrity based on ARAIM. First, an interpretation of vertical guidance (LPV-200) requirements is proposed. Then, we describe a comprehensive threat model for GNSS which includes both nominal performance and faulted behavior. We will show how the threats could be mitigated through the use of ground monitoring and the Integrity Support Message in addition to the ARAIM airborne algorithm. Finally, examples of constellation configurations providing worldwide coverage of LPV-200 are presented.
2013:Feasibility study for adding other services to Galileo baseline (SoL "reprofiled") and define the Commercial Service.
2017: EU Decision to add the following services:•A High Accuracy Service (HAS), initially at a fee, and in 2018 decided to be offered for free.• Open Service Navigation Message Authentication (OSNMA): It consists of ensuring the authenticity of navigation data. Estimated cost of implementation and 10-year operation of NMA < 0.2% of total Program cost.
• Commercial Authentication Service (CAS):access-controlled and provided at a fee. Based on the spreading code encryption of E6C (pilot) plus some ancilliary data in E6B/E1B (incl. OSNMA)
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