Enhancement of Next-Generation SBAS Correction Performance in the Arctic Region Using the Precise Orbit and Clock Product MADOCA

Mitsunori Kitamura, Toru Takahashi, Takeyasu Sakai

Abstract:	With the decline of Arctic sea ice, the feasibility of marine resource development and the use of Arctic shipping routes has increased, and the importance of safe and reliable positioning infrastructure in the Arctic is growing. However, conventional SBAS broadcasts augmentation messages from geostationary satellites and provides ionospheric delay corrections based on a ground monitoring station network; consequently, its application at high latitudes is difficult from both the standpoint of signal reception and monitor-station deployment. This paper focuses on Dual-Frequency Multi-Constellation SBAS (DFMC SBAS). To emulate the effect of future precise orbit determination within SBAS, DFMC SBAS correction messages were generated using the MADOCA precise ephemeris provided by JAXA, and the resulting improvement in correction performance in the Arctic was evaluated. The evaluation was carried out at Ny-Ålesund, Norway (78.9°N), using 24 hours of data acquired on an ionospherically quiet day. The results showed 95th-percentile positioning errors of 0.42 m horizontally and 1.30 m vertically, demonstrating sufficiently high positioning accuracy even in the Arctic. In addition, although some satellites on the Atlantic side were not augmented by MADOCA, the number of satellites required for positioning was maintained. These results indicate that correction generation based on precise orbit determination is effective for improving DFMC SBAS correction performance in the Arctic.
Published in:	Proceedings of the ION 2026 Pacific PNT Meeting April 13 - 16, 2026 Hilton Waikiki Beach Honolulu, Hawaii
Pages:	177 - 184
Cite this article:	Kitamura, Mitsunori, Takahashi, Toru, Sakai, Takeyasu, "Enhancement of Next-Generation SBAS Correction Performance in the Arctic Region Using the Precise Orbit and Clock Product MADOCA," Proceedings of the ION 2026 Pacific PNT Meeting, Honolulu, Hawaii, April 2026, pp. 177-184. https://doi.org/10.33012/2026.20620
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In