Feasibility Analysis of RAIM to Provide LPV-200 Approaches with Future GPS

摘要

The FAA formed a panel with an objective to evaluate GNSS-based architectures to provide robust LPV-200 service worldwide circa 2020–2025. One of a few architectures considered by the panel relies on Receiver Autonomous Integrity Monitoring (RAIM). In the 2020 to 2025 time frame, it is expected that a dramatically improved capability for modernized GPS will be available which will include multiple-frequency civil signals available on the satellites and possibly a larger number of satellites. RAIM could be a viable means to provide worldwide LPV-200 service. This paper develops and analyzes two RAIM methods to accommodate the new LPV-200 requirements which are still being defined by the FAA. In particular, a new approach is considered in which the integrity risk requirement is freely allocated among different satellite integrity failures in order to achieve a higher RAIM availability. The results show that, in order to provide worldwide LPV-200 service with a sufficiently high availability using this method, a constellation of at least 30 satellites is required.