ashtech GG Surveyor, Reference Manual

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80 GG Surveyor GPS+GLONASS Reference Manual
computed positions based on a different datum are desired, select the datum from Appendix A, or
issue the command $PASHS,UDD (user-defined datum).
Example: Set the datum to International 1924.
$PASHS,DTM,AST<Enter>
DUG: UTC-GPS Time Difference
$PASHQ,DUG
Displays information on the time difference between UTC and GPS system times.
The response message is in the form:
$PASHR,DUG,struct
where struct is in binary format as listed in Table 6.8
Table 6.8: GPS-UTC Time Codes
Type
Size
(bytes)
Content Units
Example
Actual
Number
Interpretation
unsigned
short 2 GPS week of current GPS-
UTC time correction week numbers 897 week 897
unsigned
short 2 GPS system time of current
GPS-UTC time correction
seconds x 2
12
(4096)
123
123x2
12
seconds
unsigned
short 2 Current GPS-UTC time
correction seconds 11 11 seconds
unsigned
short 2 GPS week of correction’s
change week numbers 834 week 834
unsigned
short 2 Day of correction’s change 1...7 1 day 1
unsigned
short 2 New GPS-UTC time correction seconds 11 11 seconds
unsigned
short 2 Checksum computed by
breaking the structure into
shorts, adding them together,
and taking the least significant
16 bits of the result.
Total bytes 14