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Once the precise GAMS parameter settings have been saved the user can skip the GAMS
Calibration procedure and proceed to the GAMS Operation section.
5.2. GAMS Calibration
If it is not possible or undesirable to accurately measure the baseline vector, and the
vehicle is capable of sufficient dynamic motion to allow the baseline vector to be
calibrated, then the GAMS Calibration feature may be used. GAMS Calibration is a
separate mode within the navigation engine which will estimate the baseline vector using
the concept of “Dynamic Heading Alignment”. Dynamic Heading Alignment uses
changes in the vehicles acceleration to align the inertially derived heading, thus making
the base-line vector in the vehicle frame observable against the GAMS base-line vector
measurement. Once successful calibration values are stored, this procedure does not need
to be repeated unless the physical location of the antennas is changed.
The GAMS requires data from five or more satellites with a Positional Dilution of
Precision (PDOP) of three, or less, to achieve a successful antenna installation
calibration. Perform the antenna installation calibration at a time when there is good
satellite geometry (i.e. low PDOP and open sky), using GNSS Mission Planning software
to determine a suitable time.
Dynamic Heading Alignment requires rapid changes in vehicle heading or velocity so
choose an area where unrestricted manoeuvring is possible, such as a large, empty, paved
parking area when on a land vehicle.
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