Spectra Precision SP90m, Руководство пользователя

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19
100-mm square. In the receiver case, the four tapped holes
are designed as follows: M4 x 0.7 - 7 mm. When tightening
M4 screws, the recommended torque is 2.6 N.m (23 lfb.in).
Note that this is a VESA
1
-compliant mounting scheme.
Bumper Mount
This type of installation is also suitable for machine guidance
or marine applications.
In this setup, the receiver is secured from its bottom side,
using the holes (dia. 4.5 mm) located in the lower part of the
four blue bumpers (see illustration below). The receiver will
be secured using M4 screws of appropriate length inserted
through these holes. Other holes (dia. 6.5 mm) also exist in
the upper part of the bumpers so you can insert a screwdriver
and tighten the four M4 fixing screws.
GNSS Antennas
Setup for Heading
Measurements
Choosing the Appropriate Baseline Length
In theory, the baseline length (i.e. the distance between the
phase centers of the two GNSS antennas used, also called
antenna separation) can be set between 5 centimeters and
1,000 meters.
In practice, you will choose the baseline length taking into
account the level of expected heading accuracy as well as the
various installation constraints in the vehicle.
The chart below shows the expected heading accuracy for a
baseline ranging from 30 centimeters to 150 meters.
1.VESA= Video Electronics Standards Association.
183 mm
133 mm