IN TRO DUC TION
1
Manta displays are provided with one of three types of
radar plotting aids:
(1)
EPA
- A manual
E
lectronic
P
lotting
A
id.
(2)
ATA
- An
A
utomatic
T
racking
A
id, with manual
acquisition and limited subset of ARPA functions
(3)
ARPA
- A comprehensive
A
utomatic
R
adar
P
lotting
A
id, with manual and automatic
acquisition and including all ARPA functions.
2
This section covers the Automatic Tracking Aid (ATA)
and the Automatic Radar Plotting Aid (ARPA).
AU TO MATIC TRACKING AID
IN TRO DUC TION
3
The specification for the Automatic Tracking Aid (ATA)
is provided at the end of this Chapter.
4
The Automatic Tracking Aid (ATA) is based on the
ARPA System and offers a 20 target capacity. Trial
Manoeuvre, Target History and Auto Acquisition facilities are
excluded from the ATA. The ATA performance is fully
compliant with the IMO requirements.
5
The ATA utilises a computer, which employs advance
processing techniques to track targets automatically.
6
The ATA provides the following facilities:
(1)
Target Acquisition
- Target with relative speeds
of up to 150 knots (KT) can be acquired out to a
range of 80nm. Up to 20 targets can be acquired
manually.
(2)
Guard Zones
- Two guard zones are available,
one preset and one variable. When a target (which
has not previously been acquired) enters a guard
zone, an alarm is given and the ATA automatically
acquires the target.
(3)
Tracking
- Acquired radar visible targets are
automatically tracked to a range of 80nm and
vectors are generated, which indicate the course
(CRSE) and speed of the target. all acquired
targets can be labelled and data on true target
course (CRSE), true speed, range, bearing
(BRG), BCR/BCT, CPA and TCPA can be
displayed.
(4)
Vector Mode
- Provides the facility of true vectors
when the display is in the RELATIVE motion
mode, and relative vectors when the display is in
the TRUE motion mode.
(5)
TCPA/CPA Limit
- The limits define the time and
closest point of approach of a target that triggers
the COLLISION WARNING alarm. The target
must violate both parameters to trigger the alarm.
TCPA limit may be varied between 1 and 60 min.,
in 1 minute increments. CPA limit may be varied
between 0.1 and 6.0 nautical miles, in increments
of 0.1 nautical miles. The default values are 15
minutes and 1 nautical mile.
(6)
BCR/BCT
- Once data is available on a target, the
bow crossing range and time can be requested.
(7)
Simulation
- Provides both a training and test
facility, the standard simulation is an off-line facility
and is based on a known solution. The known
solution is the basis for testing the integrity of the
computer.
(8)
Lost Target
- When a target is lost, the red
warning box produces a ‘WEAK ECHO
SEARCH’ alarm message and a Lost
Target symbol (see right) is placed on the
display at the last known position of the target. If
the Target is of interest, and after 10 sweeps the
Target has not been found, the Alarm message
‘LOST TARGET’ is displayed. If the Target is not
of interest, i.e. the range is greater than 3 nautical
miles, has a negative TCPA and is outside the
forward 45° either side of the Heading Line, it is
deleted.
(9)
Tracking Overload
- An alarm indicates
attempted acquisition of the 21st target and
requires that one or more targets should be
released from tracking.
(10)
Interfacing
- Target data (ATA tracked targets)
outputs are available, in IEC 61162 TTM format
and as a feed to a serial printer.
(11)
Automatic Identification System (AIS)
-
Adjustable 50 plot capacity.
Op tions
7
As detailed in the Introduction section of this manual.
KH 2020
Chap 2b
Amdt 5
2b.1
July 03
CHAPTER 2B
RADAR PLOTTING AIDS
Summary of Contents for Kelvin Hughes Nucleus 3 5000 Series
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