JRC JMA-9923-7XA - Page 208

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Gate
Size
GAUTION
Do
not change
the
preset gate
size carelessly.
lf the
gate
value
is improper, the ARPA
acquisition and
tracking
functions
may deteriorate.
Otherwise,
this
may cause
accidents to
occur.
The
Gate Size
is
defined
as an
"Area
Within
which targets are
watched by the ARPA"
processing
circuit.
lf the
gate
size
is
loo
large,
targets
are
not lost but may be swapped
with other close
targets.
lf the
gate
size
is too small,
targets
are
not easily
swapped, but may be
lost.
The ARPA
processing
circuit
is
designed
to detect
target
sizes and sel
an accurate
gate
size
depending on
the ranges and sizes of those
targets
(NARROW
is the standard size). However,
ihange the setting
parameters
to
select the
best size
in
the
following
conditions:
set
F.llnnnoW
in normal operation.
.
When
acquiring
and
tracking targets
that spread
widely
in
the
angular
direction
(The
angular
direction
of
the
gate
aperture
is important)'
' ' ' ' ' ' 'lillflDq
.
When
many targets
are densely congested
and
swapped within
3NM
in a
port
(The
gate
size should be
reduced)'
"
..''f.SM-Atil
5-32