NMEA协议: GPGGA消息格式定义
| Indicator |
Description |
| 0 |
Fix not available or invalid |
| 1 |
Single point |
| Converging PPP (TerraStar-L) |
|
| 2 |
Pseudorange differential |
| Converged PPP (TerraStar-L) |
|
| Converging PPP (TerraStar-C PRO, TerraStar-X) |
|
| 4 |
RTK fixed ambiguity solution |
| 5 |
RTK floating ambiguity solution |
| Converged PPP (TerraStar-C PRO, TerraStar-X) |
|
| 6 |
Dead reckoning mode |
| 7 |
Manual input mode (fixed position) |
| 8 |
Simulator mode |
| 9 |
WAAS (SBAS)1 |
Field |
Structure |
Description |
Symbol |
Example |
| 1 |
$GPGGA |
Log header |
|
$GPGGA |
| 2 |
utc |
UTC time status of position (hours/minutes/seconds/ decimal seconds) |
hhmmss.ss |
202134.00 |
| 3 |
lat |
Latitude (DDmm.mm) |
llll.ll |
5106.9847 |
| 4 |
lat dir |
Latitude direction (N = North, S = South) |
a |
N |
| 5 |
lon |
Longitude (DDDmm.mm) |
yyyyy.yy |
11402.2986 |
| 6 |
lon dir |
Longitude direction (E = East, W = West) |
a |
W |
| 7 |
quality |
refer to Table: GPS Quality Indicators |
x |
1 |
| 8 |
# sats |
Number of satellites in use. May be different to the number in view |
xx |
10 |
| 9 |
hdop |
Horizontal dilution of precision |
x.x |
1.0 |
| 10 |
alt |
Antenna altitude above/below mean sea level |
x.x |
1062.22 |
| 11 |
a-units |
Units of antenna altitude (M = metres) |
M |
M |
| 12 |
undulation |
Undulation - the relationship between the geoid and the WGS84 ellipsoid |
x.x |
-16.271 |
| 13 |
u-units |
Units of undulation (M = metres) |
M |
M |
| 14 |
age |
Age of correction data (in seconds) The maximum age reported here is limited to 99 seconds. |
xx |
(empty when no differential data is present) |
| 15 |
stn ID |
Differential base station ID |
xxxx |
(empty when no differential data is present) |
| 16 |
*xx |
Check sum |
*hh |
*48 |
| 17 |
[CR][LF] |
Sentence terminator |
|
[CR][LF] |
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