Ionospheric Model Performance of GPS, QZSS, and BeiDou on the Korean Peninsula

Serim Bak; Beomsoo Kim; Su-Kyung Kim; Sung Chun Bu; Chul Soo Lee

doi:10.11003/JPNT.2023.12.2.113

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자료유형: 학술저널

저자정보: Serim Bak (Satellite System Laboratory LIG Nex1 Gyeonggi-do 16911 Korea) Beomsoo Kim (Satellite System Laboratory LIG Nex1 Gyeonggi-do 16911 Korea) Su-Kyung Kim (Satellite System Laboratory LIG Nex1 Gyeonggi-do 16911 Korea) Sung Chun Bu (Satellite System Laboratory LIG Nex1 Gyeonggi-do 16911 Korea) Chul Soo Lee (Satellite System Laboratory LIG Nex1 Gyeonggi-do 16911 Korea)

저널정보: 사단법인 항법시스템학회 Journal of Positioning, Navigation, and Timing Journal of Positioning, Navigation, and Timing 제12권 제2호

발행연도: 2023.6

수록면: 113 - 119 (7page)

DOI: 10.11003/JPNT.2023.12.2.113

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Satellite navigation systems, with the exception of the GLObal NAvigation Satellite System (GLONASS), adopt ionosphere models and provide ionospheric coefficients to single-frequency users via navigation messages to correct ionospheric delay, the main source of positioning errors. A Global Navigation Satellite System (GNSS) mostly has its own ionospheric models: the Klobuchar model for Global Positioning System (GPS), the NeQuick-G model for Galileo, and the BeiDou Global Ionospheric delay correction Model (BDGIM) for BeiDou satellite navigation System (BDS)-3. On the other hand, a Regional Navigation Satellite System (RNSS) such as the Quasi-Zenith Satellite System (QZSS) and BDS-2 uses the Klobuchar Model rather than developing a new model. QZSS provides its own coefficients that are customized for its service area while BDS-2 slightly modifies the Klobuchar model to improve accuracy in the Asia-Pacific region. In addition, BDS broadcasts multiple ionospheric parameters depending on the satellites, unlike other systems. In this paper, we analyzed the different ionospheric models of GPS, QZSS, and BDS in Korea. The ionospheric models of QZSS and BDS-2, which are based in Asia, reduced error by at least 25.6% compared to GPS. However, QZSS was less accurate than GPS during geomagnetic storms or at low latitude. The accuracy of the models according to the BDS satellite orbit was also analyzed. The BDS-2 ionospheric model showed an error reduction of more than 5.9% when using GEO coefficients, while in BDS-3, the difference between satellites was within 0.01 m.

#GNSS #ionospheric delay #ionospheric coefficients #Klobuchar model #BDGIM

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