Performance Analysis of KASS Satellite Clock and Orbit Corrections

Taeho Kim, Jina Lee, Jungyo Park, Woogeun Ahn, Suk Won Jang, Byungwoon Park*

The Satellite-Based Augmentation System (SBAS) is a system that provides real-time correction and integrity information for satellite clock, orbit, and ionospheric delay errors of Global Navigation Satellite Systems (GNSS) using geostationary satellites, thereby enhancing positioning accuracy, integrity, continuity, and availability. Currently, the Wide Area Augmentation System (WAAS) in the United States, the European Geostationary Navigation Overlay Service (EGNOS) in Europe, and the MTSAT Satellite-Based Augmentation System (MSAS) in Japan are in operation. In Korea, the Korea Augmentation Satellite System (KASS) has been developed to provide correction services for Global Positioning System (GPS) satellites. To ensure the reliability of SBAS services, it is essential to quantitatively monitor and validate the correction performance of individual error components such as satellite clock and orbit errors. In this study, the satellite clock and orbit correction performance provided by KASS was quantitatively analyzed using the International GNSS Service (IGS) final precise ephemeris and clock products as reference values. The analysis results showed that the Root Mean Square (RMS) User Range Error (URE) decreased from 0.45 m for broadcast navigation messages to 0.32 m when KASS corrections were applied. These results confirm that KASS correction information effectively improves satellite clock and orbit accuracy for GPS satellites.
Keywords: SBAS, KASS, GPS, performance evaluation

Speaker 김태호 세종대학교