rtcm3-knowledge-patch
RTCM3 Knowledge Patch
RTCM SC-104 standard for differential GNSS corrections. Current version: RTCM 10403.4 (December 2023). This patch covers protocol details needed to parse RTCM3 frames, handle message types, and implement NTRIP client/server connections.
Source: RTCM Special Committee 104 standards, IGS documentation, u-blox integration guides
Quick Reference
| Area | What it covers | Details |
|---|---|---|
| Message types | Version 3.1-3.4 message number ranges, constellation coverage | Message Types and SSR |
| SSR corrections | Extended SSR (1240-1270), SSR phases 1-3, PPP-RTK | Message Types and SSR |
| MSM vs Legacy | Resolution limits, timestamp alignment, format selection | MSM vs Legacy |
| NTRIP protocol | v1/v2 client connections, base station upload, VRS | NTRIP Protocol |
Key Pragmas
- Use MSM messages (1071+) for all new implementations — legacy (1001-1012) only covers GPS/GLONASS.
- Use MSM4 for RTK corrections, MSM7 for full observables with Doppler.
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