<s>
A	O
range	B-Algorithm
gate	I-Algorithm
is	O
an	O
electronic	O
circuit	O
that	O
selects	O
signals	O
within	O
a	O
given	O
time	O
period	O
;	O
the	O
"	O
gate	O
"	O
allows	O
signals	O
to	O
pass	O
through	O
only	O
within	O
the	O
selected	O
time	O
.	O
</s>
<s>
The	O
term	O
is	O
mostly	O
used	O
in	O
radar	B-Application
,	O
where	O
range	B-Algorithm
gates	I-Algorithm
are	O
used	O
to	O
select	O
certain	O
targets	O
for	O
further	O
processing	O
.	O
</s>
<s>
In	O
early	O
military	O
radars	B-Application
,	O
range	B-Algorithm
gates	I-Algorithm
were	O
used	O
to	O
select	O
a	O
single	O
target	O
and	O
then	O
pass	O
on	O
this	O
information	O
to	O
other	O
displays	O
where	O
more	O
information	O
could	O
be	O
seen	O
.	O
</s>
<s>
IX	O
radar	B-Application
,	O
where	O
the	O
radar	B-Application
operator	O
would	O
use	O
a	O
strobe	O
,	O
an	O
on-screen	O
cursor	O
,	O
to	O
select	O
a	O
single	O
target	O
.	O
</s>
<s>
A	O
range	B-Algorithm
gate	I-Algorithm
would	O
then	O
filter	O
out	O
all	O
the	O
other	O
targets	O
that	O
might	O
be	O
visible	O
to	O
the	O
radar	B-Application
.	O
</s>
<s>
In	O
weather	B-Application
radar	I-Application
,	O
it	O
is	O
common	O
to	O
have	O
a	O
series	O
of	O
continual	O
range	B-Algorithm
gates	I-Algorithm
that	O
separate	O
out	O
returns	O
at	O
different	O
distances	O
and	O
then	O
process	O
them	O
to	O
extract	O
Doppler	O
shift	O
to	O
measure	O
wind	O
speed	O
.	O
</s>
