POS MV V5 Installation and Operation Guide
Introduction
Copyright © Applanix Corporation, 2017
1-7
When correctly configured with this information, POS MV delivers measurements for use by the
multibeam transducer, compensated for any difference in mounting angles between the transducer, the
IMU, the vessel and your chosen reference frame.
Operation without GAMS
Figure 2 and the following paragraphs describe how POS MV computes heading without GAMS.
After power-on, and the initialization and self-test routines have finished, the IMU performs a levelling
routine to establish a locally level reference frame. This occurs rapidly and usually finishes within 30
seconds.
Figure 2: Heading Measurement without GAMS
Following its levelling routine, the IMU begins to align itself to true north. This process, called
gyrocompassing, occurs much more slowly and can take from 5 to 30 minutes to complete. The time
taken to complete this process will depend on the latitude and on the manoeuvres that the vessel
performs during the operation.
A more accurate and rapid alignment will occur if the vessel performs a number of calibration manoeuvres
during the alignment process. These manoeuvres consist of full turns, starts and stops, S-curves and
figure-of-eight turns.
After alignment, the IMU delivers measurements of its heading with respect to true north. These are
accurate to between 0.2° and 2.0°, depending on the manoeuvres made by the vessel and its latitude.
POS MV without
GAMS heading aiding
Up to 30 minutes
to complete
POS MV power-on
Rotation
IMU wrt reference
frame mounting
angles
IMU begins levelling
and heading
alignment
Heading
information
Rotation
Rotation
Ship frame wrt
reference frame
mounting angles
Sensor 1 (Sonar) wrt
reference frame
mounting angles
Vessel heading
accuracy = 0.2 to 2
degrees
Sonar heading
accuracy = 0.2 to 2
degrees
Содержание POS MV V5
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