ashtech DG14, Reference Manual

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246 DG14 and DG16 Board & Sensor Reference Manual
If the command is set without a period, the DG16 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.
Example
Enter the following command to enable GST message on port B.
$PASHS,NME,GST,B,ON
$PASHQ,GST,[c1]
This command queries the GST message, 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.
$GPGST
The GST message contains UTC time, the RMS value of the standard deviation
for satellite range measurements, and the corresponding standard deviation values
for latitude, longitude, and altitude. The response is output in the format:
$GPGST,m1,f2,f3,f4,f5,f7,f8,f9*hh
Table 8.18 outlines the message format.
Table 8.18. $GPGST Message Format
Parameter Description Range
m1 UTC time (hhmmss.ss) of the position fix 000000.00 to
235959.95
f2 RMS value of the standard deviation of the satellite range inputs to
the navigation processor. This field is related to remaining fields as
follows:
• (RMS value of standard deviation range inputs)
2
* (HDOP)
2
=
(Standard deviation of latitude error)
2
+ (Standard deviation of
longitude error)
2
• (RMS value of standard deviation of range inputs)
2
* (VDOP)
2
=
(Standard deviation of altitude error)
2
0.00 to 99.99
f3 Standard deviation of semi-major axis of error ellipse (meters). 0.00 to 99.99
(might be an
empty field)
f4 Standard deviation of semi-minor axis of error ellipse (meters). 0.00 to 99.99
(might be an
empty field)
f5 Orientation of semi-major axis of error ellipse (degrees from true
north). 0.00 to 99.99
(might be an
empty field)