105
Commands
The G12 performs an internal coordinate transformation from WGS84 to WGS72
so that geodetic position messages can be output in the desired coordinates as
dictated by the parameters specified in the UDD command. Figure 4.2 illustrates
the translation and rotation that occur in the WGS84 to WGS72 transformation.
$PASHQ,UDD,[c1]
This command allows you to query for the current user-defined datum parameters,
where c1 is the optional port designator for the output of the response. If a port is
not specified, the receiver sends the response to the current port.
$PASHR,UDD
The response message is output in the format:
$PASHSR,UDD,d1,f1,f2,Dx,Dy,Dz,e
x
,e
y
,e
z
,f3
The fields in the response message are defined in Table 4.45.
Figure 4.2. Rotation and Translation Between WGS72 and WGS84
G12RevD.book Page 105 Tuesday, April 2, 2002 4:33 PM
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