ashtech G12 - VTG: Course and Speed over Ground

186 G12 OEM Board & Sensor Reference Manual
The antenna altitude is either ellipsoidal (default) or geoidal (mean-sea-level) depending on the
selection made with $PASHS,HGT (see UCT section). The geoidal altitude can be also derived by
subtracting the geoidal separation from the ellipsoidal altitude.
Typical UTM message:
$PASHR,UTM,015454.00,10S,588757.623,4136720.056,2,04,03.8, 00012.123,M,-
031.711,M,014,1010*3A
Table 4.112 describes the typical UTM response message.
VTG: Course and Speed Over Ground
$PASHS,NME,VTG,x,c,[f]
Enable/disable the velocity/course message on port x, where x is the output port,
and c is ON or OFF, and f is the optional message output rate ranging from 0.05
to 999 seconds depending upon the measurement update rate option installed.
The G12 does not output this message unless it computes a position.
If the command is set without a period, the G12 uses the period set by the
$PASHS,NME,PER command. If the $PASHS,NME,PER command is issued after
this message period has been set, the period resets to the PER setting.
Table 4.112. Typical UTM Message
Item Description
015454.00 UTC time
10S UTM zone 10; southern hemisphere
588757.623 UTM easting coordinate
4136720.056 UTM northing coordinate
2 Autonomous
04 Number of satellites used to compute position
03.8 HDOP
00012.123 altitude
M Altitude units (meters)
-031.711 geoidal separation
M geoidal separation units (meters)
014 age of corrections
1010 Differential Station ID
*3A Checksum
G12RevD.book Page 186 Tuesday, April 2, 2002 4:33 PM