Introduction
Revision 04 (English), Date: 26.04.2016
4
1
Introduction
The herein described system is especially suited for vehicles working in an outdoor
environment. The electronic unit within the antenna casing is fully submerged in a seal-
ing compound. All important adjustments are carried out via sealed potentiometers.
1.1
System Components
The track guidance system consists of mainly three different components:
-
Track guidance antenna(s) HG 19534
-
Ground unit with guide wire, loop adapter HG 94210 and possibly an end resis-
tance HG 97110
-
Track guidance generator(s) HG 57400
1.2
Functional Description
A rotationally symmetric, alternating magnetic field is produced when the guide wire
is connected over the loop adapter to the generator. The steering antenna receives
over separate channels the vertical and horizontal components of this field. Both com-
ponents are then filtered, strengthened and rectified, so that U
sum
and U
dif
are avail-
able at the output pins.
Furthermore there is a switchable output, which validates the output voltage. The re-
ception range is given by the measured sum voltage and is like this voltage; interde-
pendent upon the height and current used. It is possible to select one of eight possible
receiving frequencies by use of the three frequency select inputs.
In order to compensate for height
or
current fluctuations, a correction calculation has
to be carried out with an external computer, because the given voltages are interde-
pendent on height and current.
In order to register the vehicles angle in relation to the guide wire, a second antenna
should be connected to the vehicle. The correction calculation and calculation of the
vehicles angle is not part of this system.
