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ARP of the antenna
3.5.3
Measuring the
antenna height - pole
setup
3.6
General information
Mounting of GNSS
antennas
Heading Adjustment
Using iCON aps 200
The ARP for the CGA100 antenna is shown in the diagram.
a
005752_002
Measuring the Antenna Height for a Mast Setup
Setup Type
Antenna type
Mast
CGA100
Dual GNSS Positioning and Heading
When two GNSS antennas are connected to the iCA202 instrument and have
a clear view of the sky, the instrument automatically provides a precise GNSS
heading relative to True North.
ORP outputs heading relative to grid north instead of true north
☞
when a local grid coordinate system is used. The HDT, VTG, XDR mes-
sages will always be relative to true north as defined in NMEA-0183
standard.
The iCA202 uses a Advanced SmartHeading method of calculating the pre-
cise position of the secondary GNSS antenna. This means that precise heading
output is available even when the instrument is not receiving corrections from
a base station.
The antenna connected to port ANT1 is the primary GNSS antenna while the
one on port ANT2 is the secondary (heading) GNSS antenna.
For best results, it is recommended to mount the two GNSS antennas accord-
ing to following guidelines:
separated as far as possible,
•
at approximately the same height,
•
with the TNC connectors orientated in approximately the same direction,
•
and
ensuring an unobstructed view of the sky.
•
Heading output is the azimuth from GNSS Antenna 1 to GNSS Antenna 2. If it
is not possible to mount the antennas parallel to the centreline of the vehicle,
then the known orientation to the centreline can be entered as a Heading
Adjustment.
The Heading Adjustment field offers the opportunity to enter an angle correc-
tion in order for the heading to be calculated in the exact direction of the
machine.
a
The Antenna Reference Plane
is the underside of the
threaded metal insert.
The required measurement
vertical distance from the GNSS
antenna ARP to a fixed point on the
top of the blade (when the blade has
both zero long fall and cross fall).
27
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