ashtech DG16 - UDH: Geoidal Surface in a Local Area

178 DG14 and DG16 Board & Sensor Reference Manual
UDH: Geoidal Surface in a Local Area
$PASHS,UDH,f1,f2,f3
This command sets the parameters to determine a linear approximation of a geoidal
surface in a local area where f1, f2, and f3 are the linear parameters that
approximate a geoidal surface in a local area.
After you enter this command, and enter a UDH elevation model with the
$PASHS,HGT,UDH command, the receiver computes the orthemetric height
based on the following equation:
Orthometric Height = f1 * X + f2 * Y + f3.
X and Y are the current grid coordinates.
$PASHQ,UDH
This command queries the linear parameters entered by the $PASHS,UDH
command.
$PASHR,UDH
The response is in the format:
$PASHR,UDH,f1,f2,f3
where f1, f2, and f3 are the three parameters entered in by the $PASHS,UDH
command.
USE: Satellites for Acquisition
$PASHS,USE,d1,c2
This command excludes specific satellites from being tracked by the DG16, where
d1 is the satellite PRN number (01 to
32 for GPS and 120 to 137 for SBAS) or ALL
to enable or disable all satellites. c2 is N (exclude) or Y (include). All satellites are
included for tracking by default.
Example
Enter the following command to exclude satellite 13 from being tracked by the
receiver:
$PASHS,USE,13,N
DEFAULT SETTING
USE—ALL