Session C1: Aviation Applications of GNSS

Performance of DFMC SBAS Broadcast from non-GEO Satellites in the Arctic Region
Toru Takahashi, Electronic Navigation Research Institute; Takanori Nishiyama, National Institute of Polar Research; Mitsunori Kitamura, Susumu Saito, Electronic Navigation Research Institute; Taishi Hashimoto, National Institute of Polar Research; and Takeyasu Sakai, Electronic Navigation Research Institute
Location: Prince Jonah Room
Date/Time: Tuesday, Apr. 14, 11:39 a.m.

Arctic aviation and maritime activities are increasing due to sea ice decline, leads the need for safe navigation supported by SBAS (Satellite Based Augmentation System) and ARAIM (Advanced Receiver Autonomous Integrity Monitoring). Conventional L1 SBAS is unavailable above latitudes of 72 degree, whereas DFMC (Dual Frequency Multiconstellation) SBAS can be used in polar regions via Inclined Geosynchronous Orbit (IGSO) satellites. We evaluated DFMC SBAS broadcast from QZSS (Quasi-Zenith Satellite System) in Ny-Ålesund, Norway. During the geomagnetic storm on January 1, 2025, phase scintillation intensified; however, no DFMC SBAS message missing or positioning error exceeds protection level were observed. From December 15, 2024, to January 15, 2025, availability reached 99%. These results demonstrate that DFMC SBAS performs robustly in the Arctic, even under geomagnetic storm conditions.