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CALIBRATION
VanLink System featuring TouchStar™ Technology - Troll Systems Corporation VanLink System Requirements
Document VLSG-01 - 10/21/08 2-9
2.5 CALIBRATION
There are two components of VanLink requiring calibration that need to be performed
prior to successful operation of the VanLink operational system. The first component to
be calibrated is the magnetometer. The second component to be calibrated is the
antenna.
2.5.1 Magnetometer Calibration
After installation, the magnetometer (part of the GPS/IMU assembly) needs to be
calibrated. This procedure acquires a magnetic footprint created by any surrounding
magnetically impeding structures on/in the vehicle so, regardless of the it’s orientation
to magnetic north, the V750 can accurately pinpoint the current heading.
• In order to perform calibration on the IMU (magnetometer), the vehicle must be in a
location free of magnetic interference and as far away as possible from any nearby
structures which could potentially interfere with the magnetometer’s reference to
North.
• The vehicle must be capable of driving in a tight 360 degree circle with a laptop that
is connected to the GPS/IMU and running the calibration software.
2.5.2 Antenna Calibration
Typically calibrated to Magnetic North (to maintain compatibility with the Troll Systems
standard configuration NavTrack feature), the antenna’s orientation is calculated with an
offset to the magnetometer’s current heading. This is required to accurately orient the
dish to each respective receive site in reference to the vehicle’s GPS coordinates and
orientation to North.
2.6 REMOTE AND LOCAL CONTROL
Even without remote control, VanLink is a powerful tool. An operator can quickly press a
few buttons and have the antenna accurately align itself to the desired receive site with
very little training required. While the V750 is in LOCAL mode, only personnel in the
vehicle have control of the V750.
Full control of the antenna, including site selection as well as most control for any
additional devices, is available from the front panel. It is possible to remotely reset the
V750 to enable remote control; otherwise the personnel in the vehicle must enable
remote control from the front panel of the V750.