국내 GNSS 오차 성분별 공간 상관성 및 선형 모델링 특성 분석

• Published in: Journal of Positioning, Navigation, and Timing Vol. 13; no. 3; pp. 221 - 235
• Main Authors: 김성익, 이예빈, 조용래, 차윤호, 박병운, 박슬기, 박상현, Sungik Kim, Yebin Lee, Yongrae Jo, Yunho Cha, Byungwoon Park, Sul Gee Park, Sang Hyun Park
• Format: Journal Article
• Language: Korean
• Published: 사단법인 항법시스템학회 01.09.2024
• Subjects: 기타공학
• ISSN: 2288-8187; 2289-0866
• DOI: 10.11003/JPNT.2024.13.3.221

Errors included in Global Navigation Satellite System (GNSS) measurements degrade the performance of user position estimation but can be mitigated by spatial correlation properties. Augmentation systems providing correction data can be broadly categorized into State Space Representation (SSR) and Observation Space Representation (OSR) methods. The satellite-based cm-level augmentation service based on the SSR broadcasts correction data via satellite signals, unlike the traditional Real-Time Kinematic (RTK) and Network RTK methods, which use OSR. To provide a large amount of correction data via the limited bandwidth of the satellite communication, efficient message structure design considering service area, correction generation, and broadcast intervals is necessary. For systematic message design, it is necessary to analyze the influence of error components included in GNSS measurements. In this study, errors in satellite orbits, satellite clocks for GPS, Galileo, BeiDou, and QZSS satellite constellations ionospheric and tropospheric delays over one year were analyzed, and their spatial decorrelations and linear modeling characteristics were examined.