Northrop Grumman Sperry Marine VisionMaster FT, Руководство пользователя

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Targets Radar/Chart Radar User Guide
10-12 65900010
Target Monitoring
All targets are monitored for Lost Target. Established tracked targets and
AIS targets (both activated and sleeping) are monitored for
CPA/TCPA
using own ship’s CCRP for reference and BCR/BCT infringements, using
own ship's bow for reference.
Lost Target
If the system loses track of a target then a Lost Target alert (warning) is
raised for that target and an appropriate flashing alarm symbol placed over
the target’s symbol, see Target Monitoring Symbols.
Lost Target alerts can be raised on all nodes and a lost target range limit
may be set, so that only lost targets within a specified limit from own ship
will raise a Lost Target alert. For details refer to Limits and Settings.
On dual radar a Lost Target alert is raised if neither transceiver has seen
video in the last six scans.
Any flashing Lost Target alert symbols stop flashing when acknowledged
but the alert symbol remains centred over the lost target(s).
The alert symbol is automatically cleared if:

the target ceases to report itself as lost; or

the target is cancelled or dropped.
The Lost Target alert automatically clears when there are no lost targets.
CPA/TCPA and BCR/BCT Infringement Conditions
The conditions for a target to generate an infringement are:

Both CPA/TCPA and BCR/BCT values are positive (i.e. target has
not yet reached the closest point but will do so).

Both CPA/TCPA and BCR/BCT values are less than or equal to the
limits entered.
If an infringement is detected an alert is raised and an appropriate symbol
displayed flashing at the target's position.
Once the alert is acknowledged, any flashing alert symbols stop flashing
but remain over the target(s) infringing the limits.
The alert symbol, flashing or not flashing, is removed when:

The target no longer infringes the defined limits, for definition of
limits see Limits and Settings.

The target is cancelled or dropped.
The alert is cleared when there are no targets infringing the defined limits.