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FUNCTION
This
equipment
is high-performance
radar equipment
consisting
of
a scanner
unit,
a
transmitter-recover
unit and a
23.1-inch color raster-scan
LCD
display unit
This radar
complies
with
the current
performance
standards of the
lMO.
I Functions
of This
System
The
JMA-9900
ARPA
series
is
a
color radar system
designed
to comply
with the
international standards
of
the lMO. The
main functions
include;
sea clutter
and
rein/snow clutter
suppression,
sensitivity adjustment,
interference
reflector,
bearing
and
range measurement
using
a trackball, fixed/variable
range
makers,
and
electronic
bearing
line, and
ARPA
functions
(automatic/manual
tiarget
acquisition
and
tracking,
vector and trail displays,
alarm
displays and trial
maneuvering).
In addition,
the equipment
has
the functions
of
color
display setting
(4
views), own track
display,
NAV line and
marker
displays, TM
(True
Motion)
presentation,
Self-diagnostic
facilities. and
radar.
In
addition,
a
radar
switching
function
(lnterSwitch)
can
be
added
to switch between
two,
four
or eight
radar
units.
However, in order to this
function
for four
or eight
units,
an
external switching
box
is necessary.
f ARPA Functions
The ARPA functions
that
the
JMA-9900 series
incorporates will
be
outlined below.
I
I
]
First Stage :
Target Detection
from Radar
Information
This work corresponds
to
plotting
targets
by
band on
the radar display. Assume
that
a
ship is approaching
the
own ship.
You
can catch
the
ship on the
radar. Signals
from the
ship are
processed
with
the
data
processor
and
are
transferred to the
computer
as
signals of bearing
and
arrange
related to the own ship.
ln this
stage,
the system
has the
functions to
quantization
of
radar information, to
reject noises, to
eliminate
any
information other than
ship
information and
to
transfer necessary
position
data
of ships
to
the
computer.
I
II
]
Second Stage
: Target
Tracking
Targets are
plotted
at
intervals of 3 to 6 minutes
with the
radar, but tracking on
this
system is to
plot
them
electrically at
intervals of fixed
times.
This
means to compare
target
position
data to
be
detected
every
moment with
those
detected
previously
changes of
position
data
of the
target.
[IIIJ
Third
Stage
: Judgment
of
Existence of Ship
in Danger of
Collision
In this stage,
the system
calculates
speed
and
@urses of a target ship
from
ever-changing
position
data
of the target ship obtained
in
the
previous
stage
so as
to
judge
existence
of any
danger
of
collision.
After the calculation,
the system
can
easily
calculate the
Closest
Point of
Approach
(CPA)
to the own ship
and
the time required
to
reach the CPA
(TCPA
=
Time
to CPA). Both the CPA
and the
TCPA
are compared
with
the
preset
values
previously
set
previously
set
according to
the situations
of
the
own
ship so as
to
judge
existence
of any danger
of
collision.
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