POS MV V4 User Guide
System Operation
Copyright © Applanix Corporation, 2009
5-26
either/both GNSS receivers due, possibly, to satellites being at a low
elevation.
POS MV will continue indefinitely to try to resolve these carrier phase
ambiguities. However, if either GNSS antenna has moved by more than a few
centimetres with respect to the IMU, GAMS will never be able to resolve
ambiguities until you have completed another calibration.
Provided there has been no change to the relative mounting positions of the
antennas or the IMU, the displayed GAMS status will become Ready Online
when GAMS resolves the carrier phase ambiguities. GAMS status will show
Not Ready if GAMS has started a new OTF search.
Without GAMS heading aiding, the POS MV heading accuracy will degrade
slowly at an approximate rate of one arc-minute per minute of operation. This
slow rate of deterioration allows sufficient time to remove the vessel from the
source of GNSS signal degradation while it continues to maintain an
acceptable heading accuracy.
Once you have removed the vessel from the source of GNSS signal
degradation, GAMS status should become Online.
Installation Parameters
Figure 44 shows the GAMS Parameter Setup window. Refer to Antenna
Installation Calibration on page
4-27 for instructions on how to configure this
window with the GAMS installation parameters.
Once you have identified the GAMS installation parameters correctly, save
them to Non-Volatile Memory (NVM). It is unlikely you will ever need to modify
these parameters again unless you move either/both GNSS antennas or the
IMU.
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