<s>
ASR-11	B-Algorithm
is	O
a	O
Digital	O
Airport	O
Surveillance	O
Radar	O
(	O
DASR	O
,	O
)	O
an	O
advanced	O
radar	O
system	O
utilized	O
by	O
the	O
United	O
States	O
as	O
the	O
next	O
generation	O
of	O
terminal	O
air	B-Application
traffic	I-Application
control	I-Application
.	O
</s>
<s>
The	O
ASR-11	B-Algorithm
is	O
an	O
upgraded	O
,	O
advanced	O
version	O
of	O
the	O
previous	O
ASR-9	B-Algorithm
radar	O
.	O
</s>
<s>
Much	O
like	O
the	O
previous	O
ASR-9	B-Algorithm
,	O
the	O
ASR-11	B-Algorithm
has	O
been	O
deployed	O
around	O
airport	O
terminals	O
across	O
the	O
United	O
States	O
to	O
meet	O
the	O
requirements	O
of	O
a	O
digital	O
,	O
automated	O
air	B-Application
traffic	I-Application
monitoring	O
system	O
.	O
</s>
<s>
The	O
main	O
purpose	O
of	O
the	O
ASR-11	B-Algorithm
is	O
to	O
replace	O
aging	O
radar	O
systems	O
at	O
airfields	O
that	O
did	O
not	O
receive	O
the	O
ASR-9	B-Algorithm
,	O
as	O
well	O
as	O
use	O
across	O
the	O
world	O
by	O
the	O
United	O
States	O
Military	O
.	O
</s>
<s>
Many	O
of	O
the	O
advanced	O
parameters	O
such	O
as	O
weather	O
monitoring	O
and	O
digital	O
pinpoint	O
monitoring	O
found	O
on	O
the	O
ASR-9	B-Algorithm
are	O
also	O
found	O
on	O
the	O
ASR-11	B-Algorithm
.	O
</s>
<s>
Like	O
the	O
ASR-9	B-Algorithm
,	O
the	O
ASR-11	B-Algorithm
uses	O
a	O
continuously	O
rotating	O
antenna	O
that	O
is	O
mounted	O
on	O
a	O
tower	O
.	O
</s>
<s>
The	O
information	O
from	O
the	O
signal	O
is	O
sent	O
to	O
an	O
Air	B-Application
Traffic	I-Application
Control	I-Application
tower	O
,	O
or	O
a	O
Radar	O
Approach	O
Control	O
(	O
RAPCON	O
)	O
with	O
a	O
digital	O
tag	O
that	O
describes	O
the	O
location	O
,	O
heading	O
,	O
and	O
speed	O
at	O
which	O
the	O
aircraft	O
is	O
moving	O
.	O
</s>
<s>
The	O
overall	O
operation	O
of	O
the	O
ASR-11	B-Algorithm
is	O
similar	O
to	O
that	O
of	O
the	O
ASR-9	B-Algorithm
,	O
with	O
relatively	O
few	O
differences	O
between	O
the	O
two	O
radar	O
systems	O
.	O
</s>
<s>
There	O
are	O
only	O
two	O
main	O
areas	O
where	O
the	O
ASR-11	B-Algorithm
has	O
an	O
advantage	O
over	O
the	O
ASR-9	B-Algorithm
,	O
with	O
it	O
also	O
having	O
some	O
disadvantages	O
due	O
to	O
its	O
weather	O
capability	O
.	O
</s>
<s>
The	O
first	O
advantage	O
the	O
ASR-11	B-Algorithm
offers	O
is	O
the	O
use	O
of	O
a	O
low	O
peak-power	O
,	O
solid	O
state	O
transmitter	O
with	O
pulse	O
compression	O
technology	O
,	O
replacing	O
the	O
ASR-9	B-Algorithm
'	O
s	O
high	O
peak-power	O
,	O
short	O
pulse	O
power	O
system	O
.	O
</s>
<s>
Any	O
aircraft	O
that	O
comes	O
closer	O
than	O
six	O
nautical	O
miles	O
from	O
the	O
radar	O
cannot	O
be	O
located	O
with	O
the	O
long	O
range	O
pulse	O
system	O
built	O
into	O
the	O
ASR-11	B-Algorithm
.	O
</s>
<s>
The	O
second	O
advantage	O
of	O
using	O
an	O
ASR-11	B-Algorithm
is	O
the	O
radar	O
's	O
ability	O
to	O
utilize	O
a	O
pulse	O
sequence	O
diversity	O
.	O
</s>
<s>
This	O
feature	O
becomes	O
most	O
important	O
when	O
monitoring	O
air	B-Application
traffic	I-Application
is	O
the	O
primary	O
use	O
of	O
the	O
radar	O
.	O
</s>
<s>
The	O
main	O
disadvantage	O
of	O
using	O
an	O
ASR-11	B-Algorithm
radar	O
system	O
is	O
the	O
reduction	O
of	O
Doppler	O
Radar	O
Resolution	O
.	O
</s>
<s>
Like	O
the	O
ASR-9	B-Algorithm
,	O
the	O
ASR-11	B-Algorithm
has	O
an	O
on-site	O
,	O
dedicated	O
weather	O
reflectivity	O
processor	O
,	O
with	O
six	O
separate	O
levels	O
of	O
precipitation	O
reflectivity	O
.	O
</s>
<s>
Unlike	O
the	O
ASR-9	B-Algorithm
,	O
the	O
ASR-11	B-Algorithm
is	O
less	O
suited	O
for	O
wind	O
shear	O
detection	O
,	O
Doppler	O
wind	O
measurement	O
,	O
and	O
precipitation	O
reflectivity	O
.	O
</s>
<s>
The	O
ASR-11	B-Algorithm
radar	O
system	O
will	O
remain	O
as	O
is	O
,	O
with	O
no	O
further	O
plans	O
to	O
upgrade	O
the	O
current	O
detection	O
system	O
with	O
a	O
Weather	O
Systems	O
Processor	O
(	O
WSP	O
.	O
)	O
</s>
