<s>
A	O
surface	B-Algorithm
search	I-Algorithm
radar	I-Algorithm
,	O
sometimes	O
more	O
accurately	O
known	O
as	O
a	O
sea-surface	O
search	O
radar	B-Application
or	O
naval	O
surveillance	O
radar	B-Application
,	O
is	O
a	O
type	O
of	O
military	O
radar	B-Application
intended	O
primarily	O
to	O
locate	O
objects	O
on	O
the	O
surface	O
of	O
lakes	O
and	O
oceans	O
.	O
</s>
<s>
Part	O
of	O
almost	O
every	O
modern	O
naval	O
ship	O
,	O
they	O
are	O
also	O
widely	O
used	O
on	O
maritime	O
patrol	O
aircraft	O
and	O
naval	O
helicopters	B-Application
.	O
</s>
<s>
When	O
mounted	O
on	O
an	O
aircraft	O
,	O
they	O
are	O
sometimes	O
known	O
by	O
the	O
British	O
terminology	O
,	O
Air-to-Surface	B-Device
Vessel	I-Device
radar	I-Device
,	O
or	O
ASV	O
for	O
short	O
.	O
</s>
<s>
Similar	O
radars	B-Application
are	O
also	O
widely	O
used	O
on	O
civilian	O
ships	O
and	O
even	O
small	O
pleasure	O
craft	O
,	O
in	O
which	O
case	O
they	O
are	O
more	O
commonly	O
known	O
as	O
marine	B-Algorithm
radar	I-Algorithm
.	O
</s>
<s>
As	O
with	O
conventional	O
surveillance	O
radars	B-Application
,	O
these	O
systems	O
detect	O
objects	O
by	O
listening	O
for	O
the	O
reflections	O
of	O
a	O
radio	O
signal	O
off	O
target	O
objects	O
,	O
especially	O
metal	O
.	O
</s>
<s>
The	O
range	O
of	O
a	O
surface	B-Algorithm
search	I-Algorithm
radar	I-Algorithm
is	O
greatly	O
increased	O
compared	O
to	O
other	O
roles	O
due	O
to	O
several	O
aspects	O
of	O
the	O
sea	O
surfaces	O
and	O
the	O
objects	O
in	O
it	O
.	O
</s>
<s>
Additionally	O
,	O
as	O
the	O
sides	O
of	O
ships	O
generally	O
rise	O
vertically	O
from	O
the	O
surface	O
,	O
they	O
form	O
partial	O
corner	B-Algorithm
cubes	I-Algorithm
which	O
increases	O
the	O
returned	O
signal	O
.	O
</s>
<s>
Offsetting	O
these	O
advantages	O
is	O
the	O
fact	O
that	O
in	O
higher	O
sea	O
states	O
,	O
large	O
waves	O
also	O
create	O
the	O
same	O
signals	O
,	O
making	O
radar	B-Application
clutter	O
a	O
significant	O
problem	O
.	O
</s>
