2026-10-11T21:48:49Z https://www.scidb.cn/oai

10.57760/sciencedb.45057 2026-08-04T17:23:41Z

2026-08-04 Global DORIS Differential Slant Total Electron Content (dSTEC) Products Derived from Dual-Frequency Carrier-Phase Observations doi:10.57760/sciencedb.45057 en This dataset provides global differential slant total electron content (dSTEC) products derived from dual-frequency carrier-phase observations of the Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) system for 2015–2025. The global DORIS beacon network includes sites on continents, islands, and remote oceanic regions and therefore provides an observing-technique-independent complement to ionospheric products generated primarily from ground-based GNSS observations. The archive is organized by year, day of year, and DORIS-equipped satellite. Each daily file contains valid phase-continuous observation arcs collected by the corresponding satellite from DORIS ground beacons. The dataset spans the calendar years 2015–2025 as a whole, while mission-specific availability and completeness vary over time.The products are generated from RINEX DORIS dual-frequency carrier-phase observations and the corresponding satellite orbit information. A geometry-free dual-frequency carrier-phase combination is formed, and geometry effects associated with frequency-dependent antenna phase-center offsets at both the satellite and ground beacon are corrected. Because DORIS carrier-phase ambiguities and hardware phase delays cannot be reliably separated, a relative ionospheric observable is used. Within each phase-continuous arc, phase-derived slant TEC at the current epoch is differenced from that at the epoch of maximum satellite elevation. The resulting dSTEC observable removes arc-constant ambiguity and stable hardware phase-delay terms while preserving relative ionospheric variations along the arc.The dataset is intended for independent validation of Global Ionospheric Maps and other ionospheric models, cross-technique consistency analysis, estimation of weights for ionospheric model combination, and studies of global ionospheric variability. Users should note that dSTEC is a relative slant TEC observable and does not provide an absolute TEC datum. It represents electron-content variations below the orbit of the DORIS-equipped low-Earth-orbit satellite and does not include the entire plasmaspheric contribution above the satellite. Spatial sampling depends on the DORIS beacon network, satellite ground tracks, and mission availability. Exact file fields, sampling intervals, mission-specific coverage, and missing-data information are documented in the accompanying README, variable dictionary, and file_manifest.csv. DORIS; differential slant total electron content; ionospheric observation; dual-frequency carrier phase; global ionosphere; ionospheric model validation; Global Ionospheric Map; space geodesy 刘昂 王宁波 刘润卿 PUBLIC https://creativecommons.org/licenses/by-nc-sa/4.0/ dataset Science Data Bank