Message structure and characteristics of open formats
| Item | RTCM SSR | IGS SSR | CSSR | GAL | 3GPP LPP | SPARTN | BDS-PPP |
|---|---|---|---|---|---|---|---|
| Fixed or variable framing | variable | variable | variable | variable | variable | variable | fixed |
| Message per GNSS or combined | per GNSS | per GNSS | combined | combined | per GNSS | per GNSS | combined |
| RTCM-3 structure | Y | Y | Y | N | Y | N | N |
| Multi-GNSS | GR(EJCS) | GREJCS | GREJCS | GE | GREJCS | GR(EJC) | GREC |
| IOD of system configuration Y | Y | Y | Y | Y | Y | Y | |
| IOD of consistency (ephemeris, etc.) | N | N | Y | Y | N | Y | Y |
| IOD of mask | N | N | Y | Y | N | Y | Y |
| Satellite Mask | N | N | Y | Y | N | Y | Y |
| Signal Mask | N | N | Y | Y | N | Y | N |
| Cell Mask | N | N | Y | Y | N | N | N |
| Orbit (bit per sat., radial-along-cross resolution) | Y (62, 0.1-0.4-0.4mm) | Y (62, 0.1-0.4-0.4mm) | Y (41, 1.6-6.4-6.4mm) | Y(37, 2.5-8-8mm) | Y (62, 0.1-0.4-0.4mm) | Y (42, 2-2-2mm) | Y (41, 1.6-6.4-6.4mm) |
| Clock (bitpersat., resolution) | Y (22, 0.1mm) | Y (22, 0.1mm) | Y (15, 1.6mm) | Y (13, 2.5mm) | Y (22, 0.1mm) | Y (14, 2mm) | Y (15, 1.6mm) |
| URA | Y | Y | Y | (Y) | Y | Y | Y |
| Code Bias (bit per sat., resolution) | Y (14, 1cm) | Y (14, 1cm) | Y (11, 2cm) | Y (11, 2cm) | Y (14, 1cm) | Y (11, 2cm) | Y (12, 1.7cm) |
| Phase Bias (bit per sat., resolution) | (Y) | Y (20, 0.1mm) | Y (15, 1mm) | Y (13, 0.01cycle) | Y (15, 1mm) | Y (14, 2mm) | N |
| Troposphere | N | N | Y | N | Y | Y | N |
| Ionosphere (STEC) | N | N | Y | N | Y | Y | N |
| Ionosphere (VTEC) | (Y) | Y | N | (Y) | N | Y | N |
| Grid definition | N | N | Y | (Y) | Y | Y | N |
| Reference | (RTCM SC-104, 2020) | (IGS, 2020) | (Cabinet Office, 2021) | (European Commission et al., 2020) | (3GPP, 2020) | (SAPCORDA, 2020) | (CSNO, 2020a) |