VTEC（Vertical Total Electron Content）是一个基于地基GNSS观测数据估计全球电离层垂直电子总量的系统。该系统利用多GNSS系统（GPS、GLONASS、Galileo、BeiDou等）的双频观测数据，计算电离层斜向电子总量（STEC），然后转换为垂直电子总量（VTEC），最终利用球谐函数建立全球电离层模型。
active 2025-03-12 → 2026-03-22 (UTC)
Activity over time
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Line chart, 376 days from 2025-03-12 to 2026-03-22. Pushes: 0 total, peak 0 in a day. Pull requests: 0 total, peak 0 in a day. Issues: 0 total, peak 0 in a day. Comments: 0 total, peak 0 in a day. Stars: 19 total, peak 1 in a day.
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Stars, PRs, issues and forks are under-captured in the later part of this window. GH Archive progressively stopped capturing non-push events during 2026 — −95% or worse by the end of the window. Every series here except Pushes fades for that reason, so a decline above reflects the archive, not this repository. Pushes stay reliable throughout, so read them, and the contributor counts derived from them, as the real signal. Data health has the measurements.
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