Product Description
317748/F
43
Figure 5 Sound profile - APOS presentation
The sound velocity values may be measured by a probe and
transferred to the system. If the depth of the target (transponder)
is known either by depth sensor in the transponder or by an
ROV depth sensor, these data can be transferred to the system
and they will be used in the compensation.
The range calculation is compensated for the error caused by
different sound velocities in the water column, and for the extra
propagation path caused by the ray bending. The angular
measurements are compensated for the ray bending.
The compensation is used in all positioning modes.
9.3
Transducer alignment
After a HiPAP® installation, it is necessary to determine a
number of offsets between various sensor reference points and
axes. These are:
Vertical angular
The offset between transducer axis and roll / pitch sensor axis.
Horizontal angular
The offset between roll / pitch sensor and heading reference.
Horizontal distance
The offset between transducer location and reference point.
The principles for these alignment adjustments are based on the
position of a fixed seabed transponder relative to the vessel and
the geographical position of the vessel.
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