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reference (base) station via the $PASHS,NME,MSG set command and the
$PASHQ,MSG query command. RTCM message types 1, 9, 18, 19, 31, and 34
provide differential correction information via the $PASHS,NME,MSG set command
and $PASHQ,MSG query command.
On initial power-up or after use of the $PASHS,RST reset to defaults command, the
GG Surveyor default automatic differential mode is OFF, and the default is 60
seconds for the maximum age of an RTCM differential correction above which it will
not be used. If the automatic mode is not enabled by the $PASHS,RTC,AUT,Y set
command and the differential correction data is older than the maximum age specified
by the $PASHS,RTC,MAX set command, the GG Surveyor does not return antenna
position data.
In automatic mode, if no differential correction data is received or the age of data is
older than the specified maximum age, the GG Surveyor does return the uncorrected
raw position.
RTCM 104 Format, Version 2.2
When the GG Surveyor is used as a reference station and the RTCM base option is
enabled, the GG Surveyor computes differential corrections for up to 24 satellites (12
GPS + 12 GLO), converts those corrections to RTCM format, and transmits the
converted messages via its serial ports. It can generate message types 1, 2, 3, 6, 9, 16,
18, 19, 22, 31, 32, 34 null frame, 34, and 36 as detailed in Table 5.11.
GPS
Message
Type
1
2
3
6
9
16
18
22
66
Table 5.11: RTCM Message Types
Contents of Message
Differential GPS corrections
Delta differential corrections
Reference station parameters in
WGS 84
Null frame
GPS partial correction set
Special GPS text message
RTK carrier phase (both GPS and
GLONASS)
Extended reference station
parameter
GLONASS
Message
Type
31
Differential GLONASS correction
32
Reference station parameters in PZ-
90
34
Null frame
with no
parameters
34
GLONASS partial correction set
36
Special GLONASS text message
19
RTK pseudo-ranges (both GPS and
GLONASS)
GG Surveyor GPS+GLONASS Reference Manual
Contents of Message
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