POS MV V5 Installation and Operation Guide
Installation
Copyright © Applanix Corporation, 2017
2-5
GNSS System
Do not connect any input to the PPS (POS MV V5) or PPS OUT
(POS MV V5-1/2) port. Connecting a signal input to this port will
damage the PCS interface circuitry.
The PCS includes a dual antenna GNSS receiver for operation with the POS MV.
Multipath reflections of the received GNSS signals are the dominant source of measurement errors in the
heading aiding information computed by the GNSS Azimuth Measurement Subsystem (GAMS).
Reflectors can include flat surfaces on the vessel and the surface of the sea.
The POS MV GNSS antennas may be installed anywhere on the vessel, provided their locations meet the
following criteria:
•
Observe the environmental limitations specified on page 2-3, GNSS Antennas.
•
Avoid GNSS antenna locations that may experience multipath satellite signals caused by
reflections off nearby structures.
•
Avoid mounting the GNSS antennas where salt deposits can accumulate and degrade the
received signal quality. Remove salt deposits by washing the antenna with fresh water.
•
Do not mount the GNSS antennas closer than 0.5 m (~20 in) to any radar, UHF, satellite
communications or other communications antennas or transmitters.
•
Avoid mounting the GNSS antennas in areas that may experience high levels of vibration, shock
or electrical noise.
•
Both antennas must have the clearest possible view of the sky from horizon to horizon in all
directions. This means mounting them outside and as high as possible on the vessel.
•
Mount the GNSS antennas rigidly with respect to each other and with respect to the IMU within
the vessel. This requirement may be difficult to achieve if the antennas are mounted on separate
masts or on a single mast that can flex with respect to the vessel. Relative movement of one
antenna with respect to the other of more than 0.5 cm (~¼ in), or of both antennas with respect to
the vessel, will introduce an extra source of heading error to degrade the POS MV heading
accuracy.
•
Do not mount the antennas near any large flat surface. Large flat surfaces are a source of
multipath reflections that may degrade the accuracy of POS MV heading measurements.
•
The system includes two GNSS antennas. Install these so that they have less than 5 m (~16 ½ ft)
separation distance between them. The antenna separation distance must be more than 1 m
(~3 ¼ ft) in the horizontal vector, but it is recommended that the antennas be at least 2 m
(~6 ½ ft) apart.
Содержание POS MV V5
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