Novatel OM-20000041 用户手册
D
Logs summary
160
MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1
GPGGA
Global Position System Fix Data
Time, position and fix-related data of the
GPS
receiver. The information contained in this log is also available in
the NovAtel
GGAB
log in binary format. This log will output all null data fields until the GPSCard has achieved
first fix.
Structure:
1
The maximum age reported here is limited to 99 seconds.
2
An indicator of 9 has been temporarily set for WAAS. Then NMEA standard for WAAS has not been decided yet.
Example:
$GPGGA,220147.50,5106.7194489,N,11402.3589020,W,1,08,0.9,1080.406,M,,,,
*48[CR][LF]
*48[CR][LF]
$GPGGA
utc
lat
lat dir
lon
lon dir
GPS qual
# sats
hdop
alt
units
null
null
age
stn ID
*xx
[CR][LF]
Field
Structure
Field Description
Symbol
Example
1
$GPGGA
Log header
$GPGGA
2
utc
UTC time of position (hours/minutes/seconds/ decimal seconds)
hhmmss.ss
220147.50
3
lat
Latitude (DDmm.mm)
llll.ll
5106.7194489
4
lat dir
Latitude direction (N = North, S = South)
a
N
5
lon
Longitude (DDDmm.mm)
yyyyy.yy
11402.3589020
6
lon dir
Longitude direction (E = East, W = West)
a
W
7
GPS qual
GPS Quality indicator
0 =
0 =
fix not available or invalid
1 =
GPS fix
2 =
Differential GPS fix
4 =
RTK fixed ambiguity solution
5 =
RTK floating ambiguity solution
9 =
WAAS
2
x
1
8
# sats
Number of satellites in use (00-12). May be different to the number in view
xx
08
9
hdop
Horizontal dilution of precision
x.x
0.9
10
alt
Antenna altitude above/below mean sea level (geoid)
x.x
1080.406
11
units
Units of antenna altitude (M = meters)
M
M
12
null
(This field not available on GPSCards)
,,
13
null
(This field not available on GPSCards)
,,
14
age
Age of Differential GPS data (in seconds)
1
xx
,,
15
stn ID
Differential reference station ID, 0000-1023
xxxx
,,
16
*xx
Checksum
*hh
*48
17
[CR][LF]
Sentence terminator
[CR][LF]