<s>
Perimeter	B-Algorithm
surveillance	I-Algorithm
radar	I-Algorithm
(	O
PSR	O
)	O
is	O
a	O
class	O
of	O
radar	B-Application
sensors	O
that	O
monitor	O
activity	O
surrounding	O
or	O
on	O
critical	O
infrastructure	O
areas	O
such	O
as	O
airports	O
,	O
seaports	O
,	O
military	O
installations	O
,	O
national	O
borders	O
,	O
refineries	O
and	O
other	O
critical	O
industry	O
and	O
the	O
like	O
.	O
</s>
<s>
Such	O
radars	B-Application
are	O
characterized	O
by	O
their	O
ability	O
to	O
detect	O
movement	O
at	O
ground	O
level	O
of	O
targets	O
such	O
as	O
an	O
individual	O
walking	O
or	O
crawling	O
towards	O
a	O
facility	O
.	O
</s>
<s>
Such	O
radars	B-Application
typically	O
have	O
ranges	O
of	O
several	O
hundred	O
metres	O
to	O
over	O
10	O
kilometres	O
.	O
</s>
<s>
No	O
operator	O
required	O
:	O
The	O
radar	B-Application
autonomously	O
detects	O
movement	O
in	O
a	O
defined	O
area	O
,	O
tracks	O
those	O
targets	O
and	O
raises	O
an	O
alarm	O
if	O
the	O
targets	O
cross	O
into	O
alarm	O
areas	O
.	O
</s>
<s>
Export	O
of	O
target	O
data	O
:	O
The	O
radar	B-Application
not	O
only	O
has	O
its	O
own	O
dedicated	O
display	O
and	O
alarm	O
system	O
,	O
but	O
also	O
outputs	O
data	O
to	O
other	O
systems	O
that	O
form	O
the	O
security	O
network	O
.	O
</s>
<s>
Coverage	O
:	O
a	O
radar	B-Application
that	O
covers	O
more	O
area	O
can	O
be	O
potentially	O
more	O
useful	O
than	O
a	O
radar	B-Application
that	O
covers	O
a	O
limited	O
sector	O
.	O
</s>
<s>
Resolution	O
:	O
a	O
radar	B-Application
that	O
operates	O
at	O
higher	O
frequencies	O
and	O
with	O
narrower	O
beams	O
will	O
determine	O
target	O
positions	O
most	O
accurately	O
.	O
</s>
<s>
Low	O
false	O
alarm	O
rates	O
:	O
a	O
radar	B-Application
that	O
puts	O
out	O
false	O
targets	O
is	O
at	O
best	O
an	O
irritant	O
and	O
tactically	O
can	O
confuse	O
the	O
security	O
team	O
.	O
</s>
<s>
Characteristics	O
of	O
some	O
perimeter	B-Algorithm
surveillance	I-Algorithm
radar	I-Algorithm
systems	O
:	O
</s>
<s>
Mechanical	O
Movement	O
:	O
Older	O
PSRs	O
rely	O
on	O
rotating	O
antennas	O
while	O
newer	O
designs	O
rely	O
on	O
Beamforming	B-Algorithm
technology	O
which	O
requires	O
no	O
moving	O
parts	O
.	O
</s>
<s>
Perimeter	B-Algorithm
surveillance	I-Algorithm
radars	I-Algorithm
may	O
operate	O
in	O
areas	O
with	O
high	O
clutter	O
levels	O
.	O
</s>
<s>
In	O
the	O
range	O
of	O
frequencies	O
used	O
almost	O
all	O
objects	O
return	O
some	O
reflection	O
from	O
the	O
radar	B-Application
,	O
as	O
does	O
the	O
ground	O
itself	O
.	O
</s>
<s>
Foliage	O
presents	O
a	O
particular	O
problem	O
as	O
it	O
is	O
both	O
a	O
barrier	O
to	O
the	O
radar	B-Application
energy	O
,	O
as	O
well	O
as	O
an	O
area	O
in	O
which	O
it	O
is	O
difficult	O
to	O
detect	O
a	O
moving	O
target	O
due	O
to	O
the	O
foliage	O
being	O
blown	O
by	O
the	O
wind	O
appearing	O
as	O
multiple	O
moving	O
targets	O
.	O
</s>
<s>
To	O
a	O
degree	O
,	O
Doppler	O
based	O
radar	B-Application
can	O
detect	O
movement	O
in	O
such	O
areas	O
,	O
as	O
long	O
as	O
the	O
component	O
of	O
movement	O
velocity	O
towards	O
or	O
away	O
from	O
the	O
radar	B-Application
is	O
significant	O
enough	O
to	O
generate	O
a	O
signal	O
that	O
overcomes	O
the	O
foliage	O
return	O
signal	O
.	O
</s>
<s>
Radar	B-Application
does	O
not	O
have	O
enough	O
resolution	O
to	O
identify	O
one	O
person	O
from	O
another	O
,	O
so	O
cannot	O
be	O
used	O
as	O
a	O
substitute	O
for	O
CCTV	O
.	O
</s>
<s>
Perimeter	B-Algorithm
surveillance	I-Algorithm
radar	I-Algorithm
makers	O
include	O
:	O
</s>
<s>
with	O
the	O
,	O
and	O
high	O
resolution	O
ground	O
surveillance	O
radars	B-Application
.	O
</s>
<s>
Navtech	O
Radar	B-Application
with	O
the	O
W200	O
,	O
W500	O
,	O
W350-x	O
and	O
the	O
W800	O
;	O
</s>
<s>
with	O
the	O
low-cost	O
ground	O
surveillance	O
radar	B-Application
.	O
</s>
<s>
with	O
Compact	B-Algorithm
surveillance	I-Algorithm
radar	I-Algorithm
M600	O
,	O
M600C	O
and	O
M80	O
;	O
</s>
