Preliminary availability assessment to support single-frequency SBAS development in the Korean region
Satellite-Based Augmentation Systems (SBASs) enhance the global navigation satellite system (GNSS) to support all phases of flight by providing required accuracy, integrity, continuity, and availability. The Korean SBAS program was recently initiated to develop a single-frequency SBAS aiming to provide Approach Procedure with Vertical guidance (APV)-I Safety-of-Life (SoL) service to aviation users by 2022 within the Korean region. We assess the preliminary availability of the single-frequency SBAS which will be deployed in the Korean peninsula. The resulting system performance shall be used as a baseline to design system components and specifications. The fundamental components of SBAS architecture, SBAS monitor network, geostationary earth orbiting satellite parameters, and ionospheric grid point mask, are defined and their effects on system performance are investigated. Ionospheric correction and integrity algorithm parameters including an ionospheric irregularity threat model are determined using data collected from the Korean GNSS network. The coverage of 99.9 % availability for APV-I service increases from approximately 70 % for the baseline case to 100 % when SBAS monitor stations are expanded to overseas. Even with the expanded monitor network, however, 90 % and less than 95 % availability for LPV-200 service can be achieved only in a very limited region.
KeywordsSpace-Based Augmentation System (SBAS) SBAS architecture Availability
The authors thank the National Geographic Information Institute (NGII), the DGPS Central Office (DCO), and the Korea Astronomy and Space Science Institute (KASI) for providing the Korean GPS observation data. The authors also would like to thank the International GNSS Service (IGS), a service of the International Association of Geodesy and of the Federation of Astronomical and Geophysical Data Analysis Services for GPS observation data. The geomagnetic index data were made available by the Space Weather Prediction Center (SWPC) of the National Oceanic and Atmospheric administration (NOAA) and the World Data Center for Geomagnetism at Kyoto University. Eugene Bang was supported by the Space Core Technology Development Program of the National Research Foundation (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2014M1A3A3A02034937). Jinsil Lee was supported by KAIST Institute (KI).
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