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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 the RNP routes, there is a need for onboard navigation equipment to detect any deviations from the route autonomously without relying on surveillance radar. Only GNSS equipment with performance monitors and alert capability has been used as navigation equipment for 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 GNSS backup for RNP route. Research into high-accuracy navigation by multi-DME positioning using multiple DME ground stations is also underway. An enhancement of the performance monitor and alert capability by FDE (Fault Detectionand Exclusion, which excludes DME ground stations providing abnormal distances due to, e.g., multipath) is also being studied.

Research Group
(staff)
Atsushi Kezuka Shinji SAITOH Hiroyuki Oda
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