POS MV V4 User Guide
System Operation
Copyright © Applanix Corporation, 2009
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tracked satellites but does not process the observables from the
GNSS receivers. GAMS status displays Not Ready.
Figure 43: POSView GAMS Solution and Status Pane
3. Following the successful completion of coarse levelling, the POS
Mode transitions to Degraded Navigation status. During this time,
errors in the reported roll and pitch angles will be larger than 0.05°. If
five or more satellites are being tracked and the indicated PDOP is
less than 4.5 then GAMS begins the On-the-Fly (OTF) ambiguity
search, using only the antenna separation distance to aid the search
process. GAMS status displays Not Ready.
4. When the POS Mode transitions to Nav Aligned status, the errors in
the reported angles of roll and pitch will be less than 0.075° RMS.
The heading error remains large - in the order 10° to 15° RMS -
unless the vessel performs dynamic manoeuvres, in which case
errors may fall to below 5°.
The computed angles of roll and pitch are now sufficiently accurate to
be used by GAMS, together with the antenna separation distance, in
the OTF ambiguity search process. Additional aiding data shortens
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