ashtech DG16 - UDD: User-Defined Datum

170 DG14 and DG16 Board & Sensor Reference Manual
Example
Enter the following command to set conversion parameters for a user-defined
datum. You can use the $PASHS,DTM command to enable the conversion to the
user-defined datum.
$PASHS,UD4,0,100.0,295.5,0.00001,9.5
UDD: User-Defined Datum
$PASHS,UDD,d1,f2,f3,Dx,Dy,Dz,e
x
,e
y
,e
z
,f4
This command sets parameters for the user-defined datum and store them in
battery-backed memory. Use this command with the $PASHS,DTM,UDD
command, described on page 106. Table 6.66 lists the parameters of the
$PASHS,DTM,UDD command.
$PASHQ,UDD,[c1]
This is the associated query command, where c1 is the optional output port. If a
port is not specified, the receiver sends the response to the current port.
The response message is in the format:
$PASHR,UDD,d1,f2,f3,Dx,Dy,Dz,ex,ey,ez,f4
Table 6.66 lists the parameters.
f3 Datum rotation in seconds of arc -10.00 to 10.00
f4 Datum scale value in parts per million -10.0 to 10.0
DEFAULT SETTING
UD4 Base System—WGS-84
Table 6.66. User-defined Datum Parameters
Field Description Range Units Default
d1 Identifier for the geodetic reference
datum; always zero
0N/A0
f2 Semi-major axis 6300000.000 to
6400000.000
meters 6378137.000
Table 6.65. $PASHS,UD4 Parameters
Parameter Definition Range