Northrop Grumman Sperry Marine VisionMaster FT, Руководство пользователя

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Radar/Chart Radar User Guide System
65900010 14-23
Unaligned
The data is received in a form that requires alignment,
and this alignment has not been performed yet. This
would typically apply to heading data received via a
synchro or stepper interface. When this applies, the
data is considered unusable.
Unavailable
No data is being received from the source or too few
samples have been received recently. When this
applies, the data is considered unusable.
Uncompensated
The system could not adjust the data to be valid at the
consistent common reference point (CCRP) for the ship.
This adjustment is often referred to as a lever arm
correction. This is easiest to understand as it applies to
position data. When the system receives position data
from a GPS, the position applies to the position of the
GPS antenna, and must be adjusted to apply to the
CCRP. If the system has no heading data, it cannot
perform this adjustment. Compensation can also apply
to course over ground and speed over ground. When
data is Uncompensated, it is considered usable, but
degraded.
Uncorroborated
The data does not match the data received via other
sensors that provide the same type of data. When half
or more than half of all sensors providing a given data
type disagree with the data from one sensor, then that
sensor is considered to be "not corroborated". For
example, if we have 2 GPS sensors, and GPS1
disagrees with GPS2, then both will be "not
corroborated". If we have 3 GPS sensors, and GPS2
and GPS3 agree with each other, but disagree with
GPS1, then just GPS 1 will be "not corroborated". When
data is Uncorroborated, it is considered usable, but
degraded.