gpx-ideas
GPX Ideas - fixType
Background
It has been proposed that the list of fix types be extended.
Discussion in the GPX developer group - link
Enumerations
Current values:
| Value | Description |
|---|---|
| none | Fix not available |
| 2d | 2D GNSS fix |
| 3d | 3D GNSS fix |
| dgps | Differential GPS / GNSS fix |
| pps | Precise positioning service - secure P(Y) code |
Proposed additions, alternative text can be considered:
| Value | Alternatives | Description |
|---|---|---|
| dr | d_recko | Dead reckoning / estimated |
| float | rtk_float | Real-time kinematic (RTK) - floating point solution |
| ins | GNSS + dead reckoning - INS | |
| man | manual | Manual input - fixed position |
| ppp | Precise point positioning (PPP) | |
| rtk | rtk_int / rtk_fixed / rtk_fix | Real-time kinematic (RTK) - fixed / integer solution |
| sim | simul | Simulation |
Notes:
- PPP is rarely mentioned in receiver documentation and often indistinguishable from 2D / 3D, DGPS or RTK
- Should PPK (equivalents of RTK float and fixed) be added to the list?
Future
Who knows what else will be possible in the future?
We should probably consider things like SupercorrelationTM by FocalPoint as well.
Background information and videos are available on their website and YouTube.
References
GGA quality indicator
| Quality | Trimble | u-blox | NovAtel | Description |
|---|---|---|---|---|
| 0 | Y | Y | Y | Fix not available or invalid |
| 1 | Y | Y | Y | 2D or 3D fix Converging PPP (NovAtel TerraStar-L) |
| 2 | Y | Y | Y | Differential GPS / GNSS fix - e.g. base station or SBAS (e.g. WAAS or EGNOS) Converged PPP (NovAtel TerraStar-L) Converging PPP (NovAtel TerraStar-C, TerraStar-C PRO, TerraStar-X) |
| 3 | Y | - | - | Precise Positioning Service (PPS) - secure P(Y) code |
| 4 | Y | Y | Y | RTK fixed / integer solution |
| 5 | Y | Y | Y | RTK floating point solution Converged PPP (NovAtel TerraStar-C, TerraStar-C PRO, TerraStar-X) |
| 6 | Y | Y | Y | Estimated / dead reckoning - e.g. INS |
| 7 | - | - | Y | Manual input - fixed position |
| 8 | - | - | Y | Simulation |
| 9 | - | - | Y | SBAS - WAAS (NovAtel receivers) |
Links
FAA mode indicator
| Mode | Trimble | u-blox | NovAtel | Description |
|---|---|---|---|---|
| A | Y | Y | Y | Autonomous - 2D or 3D |
| C | - | - | - | Quectel Querk, “Caution” |
| D | Y | Y | Y | Differential mode - e.g. base station or SBAS (e.g. WAAS or EGNOS) |
| E | Y | Y | Y | Estimated / dead-reckoning |
| F | Y | Y | - | RTK floating point solution |
| M | Y | - | Y | Manual input |
| N | Y | Y | Y | Data Not Valid |
| P | Y | - | - | Precise - presumably P(Y) code? |
| R | Y | Y | - | RTK Integer solution |
| S | Y | - | - | Simulation |
| U | - | - | - | Quectel Querk, “Unsafe” |
Links
u-blox
u-blox M8 protocol specification section 31.1.6:
u-blox F9 protocol specification section 2.5.5:
