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Table 6.68: $GPMSG Structure for RTCM Message Type 18 (continued)
Typical Example 4:
Table 6.69 outlines the $GPMSG structure for message type 18.
156
Field
d11
Cumulative loss of continuity indicator (unfixed cycle slips or
loss of lock)
f2
Uncorrected Carrier Phase (Cycles)
*cc
Message checksum in hexadecimal
$GPMSG,18,0000,1747.8,4,0,170,202908.50,GLO,0,200000,0,0,20,4,01,-
8259701.2187,0,0,04,4,01,+5708064.4921,0,0,16,4,05,-
1803924.6250,0,0,14,4,01,-0383075.2578,0,0,15,4,01,-
7205926.2500,0,0,06,4,01,-0607101.0039*33
Table 6.69: $GPMSG Response for RTCM Message 18
Item
$GPMSG
Header
18
RTCM message
0000
Station ID
1747.8
Z count in seconds and tenths
4
Sequence number
0
Station health
170
Total number of characters of the time item
202908.50
Current time in hours, minutes, and seconds
GLO
GLONASS Constellation
0
L1 Frequency indicator
200000
GPS system time of measurement basis
0
Last message for this SV and Time Tag
0
Code indicator 0=C/A Code
20
GLONASS slot number (ID)
Data quality indicator (phase error ≤0.03933 cycle)
4
01
Cumulative loss of continuity error (cycle slips)
-8259701.2187
Carrier phase (cycles)
Description
Description
GG Surveyor GPS+GLONASS Reference Manual
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