Construction of Satellite Navigation Backup (APNT) for RNP Deployment throughout All Flight Phases

RNP routes are being introduced in all flight phases, including enroutes and terminal airspaces around airports, to further streamline aircraft operation. On such routes, there is a need for onboard navigation equipment to detect any route deviations autonomously without relying on surveillance radar. Only GNSS equipment with performance monitors and alert capability has been used to navigate RNP routes. However, a GNSS backup must be constructed to deploy the RNP routes, since GNSS is sometimes unavailable due to prolonged outages caused by vulnerability.

In this research, ENRI focuses on DME positioning, which requires surveillance radar monitoring for use in navigation. ENRI is researching the feasibility of adding a performance monitor and alert capability to the DME ground station and using it as a GNSS backup for RNP routes.

Research into high-accuracy navigation by multi-DME positioning using multiple DME ground stations is also underway, while scope to enhance the performance monitor and alert capability by FDE (Fault Detection and Exclusion, which excludes DME ground stations providing abnormal distances due to, e.g. multipath) is also being studied.

Construction of Satellite Navigation Backup (APNT) for RNP Deployment throughout All Flight Phases: Enhancement of Performance Monitor and Alert Capability/RNP Route/ Fault Detection and Exclusion/ Multipath(Abnormal Propagation)/ Multi-DME Positioning/ DME Ground Stations