Applanix POS MV V5 Installation And Operation Manual page 151

such as a large ship or a building. SNR degradation for low elevation
satellites may occur in either/both GNSS receivers if trees, buildings or a
bridge partially masks the satellite signal paths. If, for example, the vessel
has sailed into a harbour where large ships are moored then their hulls
may generate multipath reflections.
Remedy - Move the vessel away from the source of the high multipath
environment.
GAMS Status Remains 'Ready Online' Indefinitely
Symptom
The GAMS status display remains Ready Online for several minutes,
although the Navigator Configuration window commands POS MV to use
GAMS. Select Tools, Configuration to see the Navigator Configuration
window.
Possible Causes and Remedies
1. Cause - Incorrect Ambiguity Resolution - GAMS has identified the
wrong carrier phase ambiguities and has computed the wrong heading.
The POS MV Kalman Filter continuously rejects the GAMS heading aiding
data because it is inconsistent with the heading solution computed by the
system without GAMS aiding.
Remedy - Click on the Standby icon on the MV-POSView tool bar to
transition POS MV to standby mode. Then click on the Nav icon to return
to navigate mode. This action will re-initialize POS MV and GAMS.
2. Cause - Incorrect Heading Resolution - POS MV has computed a
heading that is incorrect in spite of the displayed heading accuracy. This
may occur if the POS MV Kalman Filter processes highly inaccurate
GNSS data during the heading alignment.
Remedy - Click on the Standby icon on the tool bar to transition POS MV
to standby mode. Then click on the Nav icon to return to navigate mode.
This action will re-initialize POS MV and GAMS.
Copyright © Applanix Corporation, 2017
POS MV V5 Installation and Operation Guide
System
Operation
5-21