ashtech HDS800, Reference Manual

Page: 298 / 678

282
Set Command Library
Command Format
Syntax
$PASHS,CPD,ARR,OFS,f1[,f2][*cc]
Parameters
Comments
• It is recommended to use a baseline elevation offset as
close as possible to zero and a baseline heading offset as
close as possible to n×90 degrees.
• If the azimuth offset is close to 0 or 180°, then the
vehicle's pitch and heading will be estimated and output.
• If the azimuth offset is close to 90 or 270°, then the
vehicle's roll and heading will be estimated and output.
• If the azimuth offset from either North, South, West or
East exceeds 15 degrees, then the receiver delivers the
heading component of attitude, but does not output pitch
and roll.
• If the elevation offset is greater than 45 degrees or less
than -45 degrees, then the receiver considers installation
to be invalid and does not output any attitude information
(i.e. no pitch, no roll and no heading).
• The specified values of offsets have an effect only when
the rover is operating in heading mode.
• Sending the command without f1 or f2 will not change the
corresponding offset value currently used, which will stay
either that entered previously through a valid CPD,ARR,
OFS command, or 0° (default value) if no such command
was run.
• With “Antenna 1” connected to the main GNSS board and
“Antenna 2” connected to the second GNSS board (or
“Antenna 2” connected to an external GNSS receiver
providing its corrections through a specified port on your
receiver), the heading will describe the direction of the
vector connecting Antenna 2 (vector origin) to Antenna 1.
Example
Setting the baseline offsets to 90° azimuth and 2° elevation:
$PASHS,CPD,ARR,OFS,90,2*02
Parameter Description Range Default
f1 Baseline azimuth offset angle. 0° to 359.99° 0°
f2 Baseline elevation offset angle -45° to +45° 0°
*cc Optional checksum *00-*FF -