Manual Initialisation; Dual Antenna - Advanced Navigation Spatial Dual Reference Manual

11.8.12

Manual Initialisation

This dialogue can be used to manually initialise Spatial Dual when a GNSS fix is not
available. Setting the position will initialise the navigation filter. Setting the heading
will initialise the heading.
11.8.13

Dual Antenna

The dual antenna configuration dialogue is only used if the antennas are not installed
in their default positions of primary front and secondary rear.
The recommended installation is with the primary antenna to the front and the
secondary antenna directly to the rear along the same axis, in which case the values
in this dialogue can be left at their factory defaults.
If it is not practical to mount the antennas in the recommended alignment, the
alternate alignment must be entered into this dialogue. It is recommended to try and
use one of the automatic offsets where possible, where the antennas must be installed
in one of four different automatic offset orientations aligned on an axis.
If it is not possible to use one of the automatic offsets, the antennas can be installed in
any configuration and a manual offset should be entered. The manual offset is
measured from the central base of the secondary antenna to the central base of the
primary antenna in the body co-ordinate frame (X positive forward, Z positive down). If
using a manual offset, please be careful to measure the offset accurately, as even
small offset errors can result in relatively large heading errors e.g. 2 cm error = 1.15
degrees heading error with a 1 metre separation.
When using an automatic offset, the manual offset values are ignored and when using
a manual offset, the automatic offset selection is ignored. When using automatic offset
the manual offset values will show the distance that Spatial Dual has automatically
measured.
Illustration 53: Screenshot of
Spatial Dual Manager position
configuration dialogue
Spatial Dual Reference Manual
Page 75 of 137
Version 2.3
12/04/2016