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논문 기본 정보

자료유형
학술저널
저자정보
이재령 (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea) 선기영 (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea) 최헌호 (Korea Aerospace Research Institute, Daejeon 34133, Korea) 이지윤 (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea)
저널정보
사단법인 항법시스템학회 Journal of Positioning, Navigation, and Timing Journal of Positioning, Navigation, and Timing Vol.13 No.1
발행연도
2024.3
수록면
63 - 73 (11page)
DOI
10.11003/JPNT.2024.13.1.63

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NeQuick G is the ionosphere model utilized by Galileo single-frequency users to estimate the ionospheric delay on each user-satellite link. The model is characterized by the effective ionization level (Az) index, determined by a modified dip latitude (MODIP) and broadcast coefficients derived from daily global space weather observations. However, globally fitted Az coefficients may not accurately represent ionosphere within local area. This study introduces a method for regional ionospheric modeling that searches for locally optimized Az coefficients. This approach involves fitting TEC output from NeQuick G to TEC data collected from GNSS stations around Korea under various ionospheric conditions including different seasons and both low and high solar activity phases. The optimized Az coefficients enable calculation of the Az index at any position within a region of interest, accounting for the spatial variability of the Az index in a polynomial function of MODIP. The results reveal reduced TEC estimation errors, particularly during high solar activity, with a maximum reduction in the RMS error by 85.95%. This indicates that the proposed method for NeQuick G can effectively model various ionospheric conditions in local areas, offering potential applications in GNSS performance analyses for local areas by generating various ionospheric scenarios.

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