User's Manual

Table Of Contents
ED 3100 G 110 / 02 (2011-10)
Operating Instructions
A-7 Target Handling
A RADAR.fm / 10.11.11
A-61
NACOS Platinum
7.4 Automatic Target Acquisition
ARPA targets can be acquired automatically, sleeping AIS targets can be activated automatically as well.
There are two possibilities to acquire/activate targets automatically:
By means of the collision avoidance computation for dangerous AIS targets
- The collision avoidance computation observes every AIS target whose data are received continu-
ously. For any of those targets, the closest point of approach (CPA) and the time until the CPA is
reached (TCPA) are computed and compared with operator-defined limits. If the CPA and TCPA
values of a target fall short of the limits, the target is activated (AIS) and the Dangerous Target
alarm is raised. See also nest chapter for details.
By means of the acquisition/guard zones for radar and AIS targets
- Two of those zones can be switched on in order to perform automatic target acquisition/activation
of ARPA and AIS targets. Any radar echo and AIS target that enters one of the zones will be
acquired/activated and an alarm is raised.
Automatic target acquisition and tracking are ensured only if the radar video is OK, i.e. if
it is adjusted in the same way as would also be necessary for visual evaluation.
Under particularly unfavourable meteorological conditions, it can happen even with an
optimum setting of the radar that targets in the radar video cannot be detected automat-
ically.
Settings for collision
avoidance computa-
tion, i.e. Dangerous
Targets
Settings for Acquisi-
tion/Guard Zones