POS MV V5 Installation and Operation Guide
Theory
of Operation
Copyright © Applanix Corporation, 2017
B-13
For example, if the heave error should be no more than 10 cm (comparable with the bathymetric
sonar resolution), and the significant heave amplitude is 0.5 metres on a given day, then the
maximum percentage error for that day is 20%.
5. A vessel that has a large displacement will usually exhibit more gradual changes of speed than
one that has a small displacement. Since the dynamics of a large vessel will not significantly
excite the transient behaviour of the filter, configure the heave filter to achieve a small percentage
steady state error at the expense of a long settling time.
Table 38 describes the variations of steady state heave error and settling time with changes in damping
ratio and bandwidth. Figure 85 through Figure 88 on pages B-14 through B-17 respectively show plots of
steady state heave error and transient behaviour for different combinations of heave filter parameters.
Table 38
:
Effects of Modifying Heave Filter Parameters
Heave Filter Tuning
Steady State
Error
Settling Time
Damping ratio
Increase
Increase
Decrease
Decrease
Decrease
Increase
Heave bandwidth
Increase
Decrease
Increase
Decrease
Increase
Decrease