HiPAP Model 501/451/351/101
42
317748/F
9
MEASUREMENT COMPENSATION
9.1
Roll - pitch - heading compensation
In order to compensate for the vessels roll / pitch / heading
movements, vertical reference sensors and heading sensors are
interfaced. Data from these sensors are used to compute position
data that is relative to horizontal level and to north.
The absolute accuracy and the standard deviation of the position
are very dependent of the roll / pitch / heading sensors
performance. Especially when working at great water depths the
roll / pitch / heading error contribution is significant and when
working at long horizontal range the heading error contribution
is significant. This compensation is used in all positioning
modes.
The accuracy of the attitude data is of crucial significance for
the total accuracy of the HiPAP® system, and the error from the
attitude sensor will add to the error of the HiPAP® system.
Example:
A roll or pith error of 0.25 degrees will give an error of 4.4 m at
1000 m depth, and an error of 13 m at 3000 m depth -
while a roll or pitch error of 0.05 degree will give respectively
0.9 m and 2.6 m.
9.2
Ray bending compensation
Positions calculated from the raw measurements are influenced
by variable sound velocity through the water column. The
variable sound velocity causes an error in both range
measurements and the angular measurements. By use of a sound
profile, the system can correct these errors.
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