Spectra Precision ProFlex 800 Reference Manual - Manual (Page 102)

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antennas at different elevations. If that is the case, this is
how you should calculate the elevation offset between the two
antennas after measuring the elevation deviation and the
baseline length. The sign of the elevation offset is also
provided on the diagram below (elevation offset negative if
Antenna #2 is lower than Antenna #1 and vice versa).
The elevation offset should not be greater than 45 degrees (or
less than -45 degrees), or the receiver will consider the
antenna setup to be invalid and so will not deliver any
heading, roll or pitch measurements.
Azimuth Offset
Ideally, the antennas should be installed to generate a
baseline strictly parallel or perperpendicular to the vehicle
centerline. However, you may also be facing some installation
constraints on your vehicle compelling you to install the
antennas differently. The azimuth offset describes the non-
alignment of the baseline with the vehicle centerline. When
the baseline is strictly parallel to the centerline and the
baseline is oriented in the direction of forward movement, the
azimuth offset is zero. In all other cases, the offset is non-
zero and should be measured as shown in the diagram below.
Baseline length
Baseline Length (m)
Elevation Deviation (m)
Elev
ation
De
v
ia
ti
o
n
Antenna #2
Antenna #1
Elevation Offset (°)
Elevation Offset (°) = arcsin
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