Novatel OM-20000041 用户手册
D
Logs summary
158
MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1
GGAB
Global Position System Fix Data (Binary Format Only)
Time, position and fix-related data of the
GPS
receiver. This binary log is a replica of the
NMEA
GPGGA
ASCII log
expressed in binary format with NovAtel header added.
Format:
Message ID = 27
Message byte count = 80
Note:
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.
Field #
Data
Bytes
Format
Units
Offset
1
Sync
3
char
0
(header)
Checksum
1
char
3
Message ID
4
integer
4
Message byte count
4
integer
8
2
UTC time of position
8
double
hhmmss.ss
12
3
Latitude (DDmm.mm)
(+ is North, - is South)
(+ is North, - is South)
8
double
degrees
20
4
Longitude (DDDmm.mm)
(+ is East, - is West)
(+ is East, - is West)
8
double
degrees
28
5
Fix status
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
4
integer
36
6
Number of satellites in use. May be different to the number in view
4
integer
40
7
Horizontal dilution of precision
8
double
44
8
Antenna altitude above/below mean-sea-level (geoid)
8
double
meters
52
9
Geoidal separation (see Figure C-6, Page 130)
8
double
meters
60
10
Age of Differential GPS data
1
8
double
seconds
68
11
Differential reference station ID, 0000-1023
4
integer
76