Spectra Precision ProFlex 800 Reference Manual - Manual (Page 172)

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Warning! The heading determined by the receiver always depicts the
direction from “Antenna 2” to “Antenna 1”.
Depending on the orientation of the baseline with respect to
the vehicle centerline (ship, plane, land vehicle, etc.), the
receiver will either compute the heading+pitch or
heading+roll angles. The value you assign to the azimuth
offset parameter will determine whether the receiver will
compute the roll or pitch angle:
• Computing Heading+Pitch: The baseline should be
strictly parallel (azimuth offset= 0°), or roughly parallel
(azimuth offset close to 0°), to the vehicle centerline.
“Antenna 1” should be placed ahead of “Antenna 2” with
respect to direction of travel.
NOTE: You can reverse the locations of Antenna 1 and
Antenna 2, but in this case you should enter a azimuth
offset equal, or close to 180°.
• Computing Heading+Roll: The baseline should be strictly
perpendicular (azimuth offset= 90°), or roughly
perpendicular (azimuth offset close to 90°), to the vehicle
centerline. For an observer taking a look at the antennas
from the back of the vehicle while looking towards the
front of the vehicle, “Antenna 1” should be seen on the
right and “Antenna 2” on the left.
NOTE: You can reverse the locations of Antenna 1 and
Antenna 2, but in this case you should enter an azimuth
offset equal, or close to 270°.
The typical baseline orientations and the computed angles
resulting from these orientations are summarized in the figure
below.