Багатоваріантність забезпечення цілісності навігаційних вимірювань на airbus А350-900

Abstract

The paper examines the principles and algorithms for ensuring the integrity of navigation measurements on the Airbus A350-900 within the framework of Performance-Based Navigation (PBN). The study focuses on a multi-variant approach realized through a two-level control structure: autonomous sensor monitoring and integrated system-level verification. At the primary level, the integrity of the Inertial Reference System (IRS) is maintained via "two-out-ofthree" voting logic, while Global Navigation Satellite System (GNSS) reliability is ensured through Receiver Autonomous Integrity Monitoring (RAIM) algorithms. At the secondary level, the Flight Management System (FMS) synthesizes hybrid navigation solutions by combining IRS data with GNSS, DME/DME, or VOR/DME updates. The research highlights the formation of a Consolidated Hybrid Position (CHP) as a result of cross-checking multiple independent navigation solutions. The author analyzes the alerting logic, including cockpit indications like "NAV IR DISAGREE" and "NAV ACCUR DOWNGRAD," which inform the crew of sensor failures or accuracy degradation. The study concludes that the multi-layered redundancy and integration of satellite and inertial data on the A350-900 provide the required levels of accuracy,continuity, and integrity essential for modern transcontinental flight operations.