APPENDIX 4 DIGITAL INTERFACE
AP-9
GBS-GNSS satellite fault direction
GGA-Global positioning system (GPS) fix data
GLL-Geographic position-latitude/longitude
$--GBS,hhmmss.ss,x.x,x.x,x.x,xx,x.x,x.x,x.x,h,h*hh<CR><LF>
| | | | | | | | | | |
| | | | | | | | | | +--------- 11
| | | | | | | | | +--- 10
| | | | | | | | +------ 9
| | | | | | | +---------- 8
| | | | | | +-------------- 7
| | | | | +------------------- 6
| | | | +------------------------ 5
| | | +---------------------------- 4
| | +-------------------------------- 3
| +------------------------------------- 2
+------------------------------------------------ 1
1. Not used
2. Expected error in latitude
3. Expected error in longitud
4. Not used
5. Not used
6. Not used
7. Not used
8. Not used
9. GNSS System ID
10. GNSS Signal ID
11. Checksum
$--GGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh<CR><LF>
| | | | | | | | | | | | | | |
| | | | | | | | | | | | | | +-- 11
| | | | | | | | | | | | | +---- 10
| | | | | | | | | | | | +--------- 9
| | | | | | | | | | +---+------------ 8
| | | | | | | | +---+------------------ 7
| | | | | | | +------------------------- 6
| | | | | | +---------------------------- 5
| | | | | +------------------------------- 4
| | | +----+--------------------------------- 3
| +---+--------------------------------------------- 2
+------------------------------------------------------------- 1
1. Not used
2. Latitude, N/S
3. Longitude, E/W
4. GPS quality indicat
5. Not used
6. Not used
7. Not used
8. Not used
9. Not used
10. Not used
11. Checksum
$--GLL,llll.ll,a,yyyyy.yy,a,hhmmss.ss,A,a*hh<CR><LF>
| | | | | | | |
| | | | | | | +------- 6
| | | | | | +--------- 5
| | | | | +----------- 4
| | | | +---------------- 3
| | +------+----------------------- 2
+--+----------------------------------- 1
1. Latitude, N/S
2. Longitude, E/W
3. Not used
4. Status: A=data valid, V=data invalid (See NOTE 1.)
5. Mode indicator (See NOTE 2.)
6. Checksum
NOTE 2: Positioning system Mode indicator:
A = Autonomous
D = Differential
E = Estimated (dead reckoning)
M = Manual input
S = Simulator
N = Data not valid
NOTE 1: The Mode indicator field supplements the status field (field 6). The
status field shoud be set to V = invalid for all values of operating mode except
for A = Autonomous and D = Differential. The positioning system Mode indicator
and status fields should not be null fields.
