ashtech HDS800, Reference Manual

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Web Server Help Files Collection
Configuration Tab
offset parameter will determine whether the receiver will
compute the roll or pitch angle:
• Computing 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 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.
Warning!
If the azimuth offset is set to a value exceeding 15° from
either North, South, West or East, then the receiver will
deliver the heading component of attitude, but not the pitch
or roll angle
.
Antenna #1
Antenna #2
Azimuth Offset= 0°
Antenna #2
Antenna #1
Azimuth Offset= 180°
Antenna #2
Azimuth Offset= 270°
Antenna #1 Antenna #1
Azimuth Offset= 90°
Antenna #2
Roll
Computed
Pitch
Computed
(Red arrow indicates the direction for which heading is measured.)