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Using
ARPA
III
Attention
There are
the following limitations on use of
the target
acquisition
and
tracking
functions
of ARPA:
Resolution
between
adjacent targets and swapping
during automatic
tracking
Depending
on the
particular
distance and echo size,
resolution
between
adjacent targets during automatic tracking usually
ranges
somewhere
between 0.03 and 0.05
nm. lf multiple targets approach
each other,
resolution will
become
about 0.03
nm
and this
may
cause
the system
to
regard
them
as one target and
thus to swap
between
them
or lose one or
more
of them. Such
swapping or
loss
of targets
may
also occur
if the
target
image is affected by rain or snow clutter, sea clutter
or
if the target
moves
close to
land.
Intensity
of echoes and
the tracking function
The intensity of echoes and
the tracking function are
correlated, and thus
the
target will be
lost if no
echoes
are detected for six
consecutive scans.
Therefore,
if there is a lost target,
radar
gain
must
be
increased
to improve
target
detection.
lf, however, radar
gain
is increased too
much, sea clutter
or
other
noise
may
be
mistakenly detected and tracked
as a target, and a
false
alarm
may result. In such cases, do not apply
strong
impact
to the
touch
panel,
trackball or
gain,
because
doing
so
may cause
a
malfunction.
Adverse
effects
of error sources
on automatic tracking
To
execute accurate
tracking,
it is necessary to
accurately adjust the
[GAIN],
[SEA]
and
[RAIN]
controls
of the radar so that
the target to be
acquired
and tracked
is clearly displayed.
Inappropriate
settings
for these
controls
will
reduce the reliability and accuracy of automatic
tracking.
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