Applanix POS MV V5 Installation And Operation Manual page 191

GNSS
If proper operation is not restored within a minute, select Tools,
Reset GNSS from the controller menu bar. The GNSS receiver is
reset to the factory defaults. This action takes a couple of minutes.
Also. if the auto configuration feature is enabled, the receiver will
assume an appropriate POS configuration.
Finally, if all else fails, cycle the PCS power (off and on) to provide a
hard reset of the GNSS receiver. Refer to the Power-On and Power-
Off procedures on pages 4-1 and 4-27 respectively.
GAMS
The GAMS subsystem can experience a permanent loss of satellites,
or a communication failure between the GNSS receiver and the PCS.
Permanent Loss of Satellites
The GAMS Solution window provides information on satellites being
tracked and the status of GAMS; select View, GAMS Solution to
view this window.
GAMS may experience periodic GNSS dropouts caused, for example,
by an antenna obstruction. During these dropouts, GAMS is unable to
compute a heading solution and the controller Status pane indicates
Not ready in the GAMS field.
However, if a GAMS dropout occurs and persists without any
apparent antenna obstruction, one of the following problems may
exist:
•
•
•
•
The above diagnosis assumes that the PCS continues to receive
messages from the secondary GNSS receiver. Select View, GAMS
Solution to see the GAMS status.
GAMS Ambiguity Resolution Failures
If there is a GAMS ambiguity resolution failure, the controller Status
pane indicates Not ready in the GAMS field. The same status is
indicated when there is satellite signal loss due to an antenna
obstruction.
The POS MV Message Log window specifically indicates GAMS
ambiguity resolution failures; see Figure 64 on page 9-9.
Copyright © Applanix Corporation, 2017
POS MV V5 Installation and Operation Guide
A loss of GNSS receiver configuration
A failure in the GNSS antenna
A failure in the GNSS antenna cable
A failure in the GNSS receiver
Fault
Identification
9-17