ashtech GG Surveyor, Reference Manual

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158 GG Surveyor GPS+GLONASS Reference Manual
RTCM type 19 is the uncorrected code phase message used to transmit data to the
rover for RTK processing. The format for RTCM type 19 is:
$GPMSG,d1,d2,f1,d3,d4,d5,m1,s1,d6,d7,d8,n(d9,d10,d11,d12,f2)*cc
Table 6.70 outlines the $GPMSG response message format for RTK Uncorrected
Pseudoranges (Type 19):
-0607101.0039 Carrier phase (cycles)
*33 Message checksum in hexadecimal
Table 6.70: $GPMSG Structure for RTCM Message Type 19
Field Description
d1 RTCM type, 19
d2 Station identifier, 0000 to 1023
f1 Z count in seconds and tenths, 0000.0 to 3600.0
d3 Sequence number, 0 to 7
d4 Station health, 0 to 7
d5 Total number of characters after the time item, 000 to 999
m1 Current UTC time of position computation in hours,
minutes, and seconds
s1 GPS / GLONASS Constellation Indicator
d6 Frequency Indicator: “00”: L1 message, “01”: L2 message,
“10”,”11” :Reserved
d7 Smoothing Interval (0=1 min, 1 = 1..5 min, 2=5..15 min,
3=undefined)
d8 GNSS Time of measurement (GPS or GLONASS time)
(added to Z-Count)
The following data is displayed for each Satellite in the
message:
d9 Multiple message indicator (1 = more messages will follow
with same time tag, 0 = last message)
d10 GPS (PRN Range 0-31) or GLONASS (Slot number 1-24)
Satellite ID
d11 Data Quality Indicator (See RTCM Paper 88-97/SC104-156
Version 2.2)
Table 6.69: $GPMSG Response for RTCM Message 18 (continued)
Item Description