SEPTENTRIO AsteRx SBi, Руководство пользователя

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CHAPTER 3. CONF I GUR I NG THE ASTERX SB I 3
Figure 3-8: Examples of a number of antenna setups and the corresponding
heading o ff sets. a.) The default setup for which the angle between the antenna
baseline and the longitudinal axis is 0 and no heading o ff set needs to be set. b.) a
slight deviation (5Â ř ) from the longitudinal axis in the clockwise direction is re fl ected
by a positive increase in the heading o ff set. c.) An alternative antenna con fi guration
where the antennas are placed perpendicular to the longitudinal axis. d.) An
alternative antenna con fi guration where the antennas are placed perpendicular to
the longitudinal axis with a small deviation.
The examples above all relate to a heading o ff set but the antenna orientation can also
be characterized by a vertical o ff set. Vertical o ff sets can be compensated for by adjusting
the Pitch o ff set. This may be necessary in cases where the antenna baseline is not exactly
parallel to the longitudinal axis of the vehicle or in situations where the two antenna ARPs
may not be exactly at the same height in the vehicle reference frame. Since pitch is de
fi ned
as the right-handed rotation about the vehicle Y axis, a situation where the main antenna is
mounted lower than the aux antenna (assuming the default antenna setup) will result in a
positive pitch a shown in Figure 3-9.
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