<s>
An	O
active	B-Architecture
electronically	I-Architecture
scanned	I-Architecture
array	I-Architecture
(	O
AESA	O
)	O
is	O
a	O
type	O
of	O
phased	O
array	B-Algorithm
antenna	I-Algorithm
,	O
which	O
is	O
a	O
computer-controlled	O
array	B-Algorithm
antenna	I-Algorithm
in	O
which	O
the	O
beam	O
of	O
radio	O
waves	O
can	O
be	O
electronically	O
steered	O
to	O
point	O
in	O
different	O
directions	O
without	O
moving	O
the	O
antenna	O
.	O
</s>
<s>
This	O
contrasts	O
with	O
a	O
passive	B-Algorithm
electronically	I-Algorithm
scanned	I-Algorithm
array	I-Algorithm
(	O
PESA	O
)	O
,	O
in	O
which	O
all	O
the	O
antenna	O
elements	O
are	O
connected	O
to	O
a	O
single	O
transmitter	O
and/or	O
receiver	O
through	O
phase	B-Algorithm
shifters	I-Algorithm
under	O
the	O
control	O
of	O
the	O
computer	O
.	O
</s>
<s>
AESA	O
's	O
main	O
use	O
is	O
in	O
radar	B-Application
,	O
and	O
these	O
are	O
known	O
as	O
active	B-Architecture
phased	I-Architecture
array	I-Architecture
radar	B-Application
(	O
APAR	O
)	O
.	O
</s>
<s>
The	O
PESA	O
must	O
utilize	O
a	O
Butler	B-Algorithm
matrix	I-Algorithm
if	O
multiple	O
beams	O
are	O
required	O
.	O
</s>
<s>
AESA	B-Architecture
radars	I-Architecture
can	O
spread	O
their	O
signal	O
emissions	O
across	O
a	O
wider	O
range	O
of	O
frequencies	O
,	O
which	O
makes	O
them	O
more	O
difficult	O
to	O
detect	O
over	O
background	O
noise	O
,	O
allowing	O
ships	O
and	O
aircraft	O
to	O
radiate	O
powerful	O
radar	B-Application
signals	O
while	O
still	O
remaining	O
stealthy	O
,	O
as	O
well	O
as	O
being	O
more	O
resistant	O
to	O
jamming	O
.	O
</s>
<s>
Bell	O
Labs	O
proposed	O
replacing	O
the	O
Nike	O
Zeus	O
radars	B-Application
with	O
a	O
phased	O
array	O
system	O
in	O
1960	O
,	O
and	O
was	O
given	O
the	O
go-ahead	O
for	O
development	O
in	O
June	O
1961	O
.	O
</s>
<s>
The	O
result	O
was	O
the	O
Zeus	O
Multi-function	O
Array	O
Radar	B-Application
(	O
ZMAR	O
)	O
,	O
an	O
early	O
example	O
of	O
an	O
active	B-Architecture
electronically	I-Architecture
steered	I-Architecture
array	I-Architecture
radar	B-Application
system	I-Application
.	O
</s>
<s>
The	O
MAR	O
(	O
Multi-function	O
Array	O
Radar	B-Application
)	O
was	O
made	O
of	O
a	O
large	O
number	O
of	O
small	O
antennas	O
,	O
each	O
one	O
connected	O
to	O
a	O
separate	O
computer-controlled	O
transmitter	O
or	O
receiver	O
.	O
</s>
<s>
Using	O
a	O
variety	O
of	O
beamforming	B-Algorithm
and	O
signal	O
processing	O
steps	O
,	O
a	O
single	O
MAR	O
was	O
able	O
to	O
perform	O
long-distance	O
detection	O
,	O
track	O
generation	O
,	O
discrimination	O
of	O
warheads	O
from	O
decoys	O
,	O
and	O
tracking	O
of	O
the	O
outbound	O
interceptor	O
missiles	O
.	O
</s>
<s>
Remote	O
batteries	O
were	O
equipped	O
with	O
a	O
much	O
simpler	O
radar	B-Application
whose	O
primary	O
purpose	O
was	O
to	O
track	O
the	O
outgoing	O
Sprint	O
missiles	O
before	O
they	O
became	O
visible	O
to	O
the	O
potentially	O
distant	O
MAR	O
.	O
</s>
<s>
These	O
smaller	O
Missile	O
Site	O
Radars	B-Application
(	O
MSR	O
)	O
were	O
passively	O
scanned	O
,	O
forming	O
only	O
a	O
single	O
beam	O
instead	O
of	O
the	O
MAR	O
's	O
multiple	O
beams	O
.	O
</s>
<s>
Four	O
years	O
later	O
another	O
radar	B-Application
of	O
this	O
design	O
was	O
built	O
on	O
Kura	O
Test	O
Range	O
,	O
while	O
the	O
S-225	O
system	O
was	O
never	O
commissioned	O
.	O
</s>
<s>
The	O
first	O
series	O
production	O
ship-based	O
AESA	O
was	O
the	O
OPS-24	O
,	O
a	O
fire-control	O
radar	B-Application
introduced	O
on	O
the	O
Japanese	O
Asagiri-class	O
destroyer	O
DD-155	O
Hamagiri	O
launched	O
in	O
1988	O
.	O
</s>
<s>
US	O
based	O
manufacturers	O
of	O
the	O
AESA	B-Architecture
radars	I-Architecture
used	O
in	O
the	O
F-22	B-Application
and	O
Super	O
Hornet	O
include	O
Northrop	O
Grumman	O
and	O
Raytheon	O
.	O
</s>
<s>
These	O
companies	O
also	O
design	O
,	O
develop	O
and	O
manufacture	O
the	O
transmit/receive	O
modules	O
which	O
comprise	O
the	O
'	O
building	O
blocks	O
 '	O
of	O
an	O
AESA	B-Architecture
radar	I-Architecture
.	O
</s>
<s>
The	O
requisite	O
electronics	O
technology	O
was	O
developed	O
in-house	O
via	O
Department	O
of	O
Defense	O
research	O
programs	O
such	O
as	O
MMIC	B-Algorithm
Program	O
.	O
</s>
<s>
In	O
2016	O
the	O
Congress	O
funded	O
a	O
military	O
industry	O
competition	O
to	O
produce	O
new	O
radars	B-Application
for	O
two	O
dozen	O
National	O
Guard	O
fighter	O
aircraft	O
.	O
</s>
<s>
Radar	B-Application
systems	I-Application
generally	O
work	O
by	O
connecting	O
an	O
antenna	O
to	O
a	O
powerful	O
radio	O
transmitter	O
to	O
emit	O
a	O
short	O
pulse	O
of	O
signal	O
.	O
</s>
<s>
By	O
measuring	O
the	O
time	O
it	O
takes	O
for	O
the	O
signal	O
to	O
return	O
,	O
the	O
radar	B-Application
receiver	O
can	O
determine	O
the	O
distance	O
to	O
the	O
object	O
.	O
</s>
<s>
The	O
receiver	O
then	O
sends	O
the	O
resulting	O
output	O
to	O
a	O
display	B-Algorithm
of	I-Algorithm
some	I-Algorithm
sort	I-Algorithm
.	O
</s>
<s>
The	O
transmitter	O
elements	O
were	O
typically	O
klystron	O
tubes	O
or	O
magnetrons	B-Device
,	O
which	O
are	O
suitable	O
for	O
amplifying	O
or	O
generating	O
a	O
narrow	O
range	O
of	O
frequencies	O
to	O
high	O
power	O
levels	O
.	O
</s>
<s>
To	O
scan	O
a	O
portion	O
of	O
the	O
sky	O
,	O
the	O
radar	B-Application
antenna	O
must	O
be	O
physically	O
moved	O
to	O
point	O
in	O
different	O
directions	O
.	O
</s>
<s>
That	O
led	O
to	O
the	O
first	O
practical	O
large-scale	O
passive	B-Algorithm
electronically	I-Algorithm
scanned	I-Algorithm
array	I-Algorithm
(	O
PESA	O
)	O
,	O
or	O
simply	O
phased	B-Algorithm
array	I-Algorithm
radar	I-Algorithm
.	O
</s>
<s>
Additionally	O
,	O
thanks	O
to	O
progress	O
in	O
electronics	O
,	O
PESAs	O
added	O
the	O
ability	O
to	O
produce	O
several	O
active	O
beams	O
,	O
allowing	O
them	O
to	O
continue	O
scanning	O
the	O
sky	O
while	O
at	O
the	O
same	O
time	O
focusing	O
smaller	O
beams	O
on	O
certain	O
targets	O
for	O
tracking	O
or	O
guiding	O
semi-active	O
radar	B-Application
homing	O
missiles	O
.	O
</s>
<s>
It	O
gave	O
rise	O
to	O
amplifier-transmitters	O
with	O
a	O
low-power	O
solid-state	O
waveform	O
generator	O
feeding	O
an	O
amplifier	O
,	O
allowing	O
any	O
radar	B-Application
so	O
equipped	O
to	O
transmit	O
on	O
a	O
much	O
wider	O
range	O
of	O
frequencies	O
,	O
to	O
the	O
point	O
of	O
changing	O
operating	O
frequency	O
with	O
every	O
pulse	O
sent	O
out	O
.	O
</s>
<s>
Among	O
these	O
are	O
:	O
the	O
ability	O
to	O
form	O
multiple	O
beams	O
simultaneously	O
,	O
to	O
use	O
groups	O
of	O
TRMs	O
for	O
different	O
roles	O
concurrently	O
,	O
like	O
radar	B-Application
detection	O
,	O
and	O
,	O
more	O
importantly	O
,	O
their	O
multiple	O
simultaneous	O
beams	O
and	O
scanning	O
frequencies	O
create	O
difficulties	O
for	O
traditional	O
,	O
correlation-type	O
radar	B-Application
detectors	O
.	O
</s>
<s>
Radar	B-Application
systems	I-Application
work	O
by	O
sending	O
out	O
a	O
signal	O
and	O
then	O
listening	O
for	O
its	O
echo	O
off	O
distant	O
objects	O
.	O
</s>
<s>
That	O
means	O
that	O
a	O
radar	B-Application
's	O
received	O
energy	O
drops	O
with	O
the	O
fourth	O
power	O
of	O
the	O
distance	O
,	O
which	O
is	O
why	O
radar	B-Application
systems	I-Application
require	O
high	O
powers	O
,	O
often	O
in	O
the	O
megawatt	O
range	O
,	O
to	O
be	O
effective	O
at	O
long	O
range	O
.	O
</s>
<s>
The	O
radar	B-Application
signal	O
being	O
sent	O
out	O
is	O
a	O
simple	O
radio	O
signal	O
,	O
and	O
can	O
be	O
received	O
with	O
a	O
simple	O
radio	O
receiver	O
.	O
</s>
<s>
Military	O
aircraft	O
and	O
ships	O
have	O
defensive	O
receivers	O
,	O
called	O
"	O
radar	B-Application
warning	O
receivers	O
"	O
(	O
RWR	O
)	O
,	O
which	O
detect	O
when	O
an	O
enemy	O
radar	B-Application
beam	O
is	O
on	O
them	O
,	O
thus	O
revealing	O
the	O
position	O
of	O
the	O
enemy	O
.	O
</s>
<s>
Unlike	O
the	O
radar	B-Application
unit	O
,	O
which	O
must	O
send	O
the	O
pulse	O
out	O
and	O
then	O
receive	O
its	O
reflection	O
,	O
the	O
target	O
's	O
receiver	O
does	O
not	O
need	O
the	O
reflection	O
and	O
thus	O
the	O
signal	O
drops	O
off	O
only	O
as	O
the	O
square	O
of	O
distance	O
.	O
</s>
<s>
This	O
means	O
that	O
the	O
receiver	O
is	O
always	O
at	O
an	O
advantage	O
[	O
neglecting	O
disparity	O
in	O
antenna	O
size ]	O
over	O
the	O
radar	B-Application
in	O
terms	O
of	O
range	O
-	O
it	O
will	O
always	O
be	O
able	O
to	O
detect	O
the	O
signal	O
long	O
before	O
the	O
radar	B-Application
can	O
see	O
the	O
target	O
's	O
echo	O
.	O
</s>
<s>
Since	O
the	O
position	O
of	O
the	O
radar	B-Application
is	O
extremely	O
useful	O
information	O
in	O
an	O
attack	O
on	O
that	O
platform	O
,	O
this	O
means	O
that	O
radars	B-Application
generally	O
must	O
be	O
turned	O
off	O
for	O
lengthy	O
periods	O
if	O
they	O
are	O
subject	O
to	O
attack	O
;	O
this	O
is	O
common	O
on	O
ships	O
,	O
for	O
instance	O
.	O
</s>
<s>
Unlike	O
the	O
radar	B-Application
,	O
which	O
knows	O
which	O
direction	O
it	O
is	O
sending	O
its	O
signal	O
,	O
the	O
receiver	O
simply	O
gets	O
a	O
pulse	O
of	O
energy	O
and	O
has	O
to	O
interpret	O
it	O
.	O
</s>
<s>
Since	O
the	O
radio	O
spectrum	O
is	O
filled	O
with	O
noise	O
,	O
the	O
receiver	O
's	O
signal	O
is	O
integrated	O
over	O
a	O
short	O
period	O
of	O
time	O
,	O
making	O
periodic	O
sources	O
like	O
a	O
radar	B-Application
add	O
up	O
and	O
stand	O
out	O
over	O
the	O
random	O
background	O
.	O
</s>
<s>
The	O
rough	O
direction	O
can	O
be	O
calculated	O
using	O
a	O
rotating	O
antenna	O
,	O
or	O
similar	O
passive	O
array	O
using	O
phase	B-Algorithm
or	O
amplitude	B-Algorithm
comparison	I-Algorithm
.	O
</s>
<s>
Typically	O
RWRs	O
store	O
the	O
detected	O
pulses	O
for	O
a	O
short	O
period	O
of	O
time	O
,	O
and	O
compare	O
their	O
broadcast	O
frequency	O
and	O
pulse	O
repetition	O
frequency	O
against	O
a	O
database	O
of	O
known	O
radars	B-Application
.	O
</s>
<s>
The	O
direction	O
to	O
the	O
source	O
is	O
normally	O
combined	O
with	O
symbology	O
indicating	O
the	O
likely	O
purpose	O
of	O
the	O
radar	B-Application
–	O
airborne	O
early	O
warning	O
and	O
control	O
,	O
surface-to-air	O
missile	O
,	O
etc	O
.	O
</s>
<s>
This	O
technique	O
is	O
much	O
less	O
useful	O
against	O
a	O
radar	B-Application
with	O
a	O
frequency-agile	O
(	O
solid	O
state	O
)	O
transmitter	O
.	O
</s>
<s>
Moreover	O
,	O
a	O
radar	B-Application
may	O
be	O
designed	O
to	O
extend	O
the	O
duration	O
of	O
the	O
pulse	O
and	O
lower	O
its	O
peak	O
power	O
.	O
</s>
<s>
Older	O
generation	O
RWRs	O
are	O
essentially	O
useless	O
against	O
AESA	B-Architecture
radars	I-Architecture
,	O
which	O
is	O
why	O
AESAs	O
are	O
also	O
known	O
as	O
low	O
probability	O
of	O
intercept	O
radars	B-Application
.	O
</s>
<s>
Modern	O
RWRs	O
must	O
be	O
made	O
highly	O
sensitive	O
(	O
small	O
angles	O
and	O
bandwidths	B-Algorithm
for	O
individual	O
antennas	O
,	O
low	O
transmission	O
loss	O
and	O
noise	O
)	O
and	O
add	O
successive	O
pulses	O
through	O
time-frequency	O
processing	O
to	O
achieve	O
useful	O
detection	O
rates	O
.	O
</s>
<s>
Traditionally	O
,	O
jammers	O
have	O
operated	O
by	O
determining	O
the	O
operating	O
frequency	O
of	O
the	O
radar	B-Application
and	O
then	O
broadcasting	O
a	O
signal	O
on	O
it	O
to	O
confuse	O
the	O
receiver	O
as	O
to	O
which	O
is	O
the	O
"	O
real	O
"	O
pulse	O
and	O
which	O
is	O
the	O
jammer	O
's	O
.	O
</s>
<s>
This	O
technique	O
works	O
as	O
long	O
as	O
the	O
radar	B-Application
system	I-Application
cannot	O
easily	O
change	O
its	O
operating	O
frequency	O
.	O
</s>
<s>
When	O
the	O
transmitters	O
were	O
based	O
on	O
klystron	O
tubes	O
this	O
was	O
generally	O
true	O
,	O
and	O
radars	B-Application
,	O
especially	O
airborne	O
ones	O
,	O
had	O
only	O
a	O
few	O
frequencies	O
to	O
choose	O
among	O
.	O
</s>
<s>
Most	O
radars	B-Application
using	O
modern	O
electronics	O
are	O
capable	O
of	O
changing	O
their	O
operating	O
frequency	O
with	O
every	O
pulse	O
.	O
</s>
<s>
In	O
this	O
case	O
,	O
the	O
jamming	O
will	O
be	O
the	O
same	O
frequency	O
as	O
the	O
radar	B-Application
for	O
only	O
a	O
short	O
period	O
,	O
while	O
the	O
rest	O
of	O
the	O
radar	B-Application
pulse	O
is	O
unjammed	O
.	O
</s>
<s>
By	O
integrating	O
received	O
signals	O
from	O
the	O
targets	O
 '	O
own	O
radar	B-Application
along	O
with	O
a	O
lower	O
rate	O
of	O
data	O
from	O
its	O
own	O
broadcasts	O
,	O
a	O
detection	O
system	O
with	O
a	O
precise	O
RWR	O
like	O
an	O
AESA	O
can	O
generate	O
more	O
data	O
with	O
less	O
energy	O
.	O
</s>
<s>
Some	O
receive	O
beamforming-capable	O
systems	O
,	O
usually	O
ground-based	O
,	O
may	O
even	O
discard	O
a	O
transmitter	O
entirely	O
.	O
</s>
<s>
Obtaining	O
a	O
range	O
and	O
a	O
target	O
vector	O
requires	O
at	O
least	O
two	O
physically	O
separate	O
passive	O
devices	O
for	O
triangulation	B-Algorithm
to	O
provide	O
instantaneous	O
determinations	O
,	O
unless	O
phase	B-Algorithm
interferometry	I-Algorithm
is	O
used	O
.	O
</s>
<s>
Since	O
each	O
element	O
in	O
an	O
AESA	O
is	O
a	O
powerful	O
radio	O
receiver	O
,	O
active	O
arrays	O
have	O
many	O
roles	O
besides	O
traditional	O
radar	B-Application
.	O
</s>
<s>
One	O
use	O
is	O
to	O
dedicate	O
several	O
of	O
the	O
elements	O
to	O
reception	O
of	O
common	O
radar	B-Application
signals	O
,	O
eliminating	O
the	O
need	O
for	O
a	O
separate	O
radar	B-Application
warning	O
receiver	O
.	O
</s>
<s>
The	O
same	O
basic	O
concept	O
can	O
be	O
used	O
to	O
provide	O
traditional	O
radio	O
support	O
,	O
and	O
with	O
some	O
elements	O
also	O
broadcasting	O
,	O
form	O
a	O
very	O
high	O
bandwidth	B-Algorithm
data	O
link	O
.	O
</s>
<s>
The	O
F-35	O
uses	O
this	O
mechanism	O
to	O
send	O
sensor	O
data	O
between	O
aircraft	O
in	O
order	O
to	O
provide	O
a	O
synthetic	O
picture	O
of	O
higher	O
resolution	O
and	O
range	O
than	O
any	O
one	O
radar	B-Application
could	O
generate	O
.	O
</s>
<s>
Replacing	O
a	O
mechanically	O
scanned	O
array	O
with	O
a	O
fixed	O
AESA	O
mount	O
(	O
such	O
as	O
on	O
the	O
Boeing	O
F/A-18E/F	O
Super	O
Hornet	O
)	O
can	O
help	O
reduce	O
an	O
aircraft	O
's	O
overall	O
radar	B-Application
cross-section	O
(	O
RCS	O
)	O
,	O
but	O
some	O
designs	O
(	O
such	O
as	O
the	O
Eurofighter	B-Application
Typhoon	I-Application
)	O
forgo	O
this	O
advantage	O
in	O
order	O
to	O
combine	O
mechanical	O
scanning	O
with	O
electronic	O
scanning	O
and	O
provide	O
a	O
wider	O
angle	O
of	O
total	O
coverage	O
.	O
</s>
<s>
This	O
high	O
off-nose	O
pointing	O
allows	O
the	O
AESA	O
equipped	O
fighter	O
to	O
employ	O
a	O
Crossing	O
the	O
T	O
maneuver	O
,	O
often	O
referred	O
to	O
as	O
"	O
beaming	O
"	O
in	O
the	O
context	O
of	O
air-to-air	O
combat	O
,	O
against	O
a	O
mechanically	O
scanned	O
radar	B-Application
that	O
would	O
filter	O
out	O
the	O
low	O
closing	O
speed	O
of	O
the	O
perpendicular	O
flight	O
as	O
ground	O
clutter	O
while	O
the	O
AESA	O
swivels	O
40	O
degrees	O
towards	O
the	O
target	O
in	O
order	O
to	O
keep	O
it	O
within	O
the	O
AESA	O
's	O
60	O
degree	O
off-angle	O
limit	O
.	O
</s>
<s>
With	O
a	O
shorter	O
element	O
distance	O
,	O
the	O
highest	O
field	O
of	O
view	O
(	O
FOV	O
)	O
for	O
a	O
flat	O
phased	O
array	B-Algorithm
antenna	I-Algorithm
is	O
currently	O
120°	O
( °	O
)	O
,	O
although	O
this	O
can	O
be	O
combined	O
with	O
mechanical	O
steering	O
as	O
noted	O
above	O
.	O
</s>
<s>
AN/APG	B-Device
-83	I-Device
SABR	O
,	O
for	O
the	O
F-16V	O
Viper	O
and	O
B-1B	O
Lancer	O
upgrades	O
.	O
</s>
<s>
AN/APG	O
-84	O
RACR	O
(	O
Raytheon	O
Advanced	O
Combat	O
Radar	B-Application
)	O
for	O
F-16	O
and	O
F/A	O
-18	O
upgrades	O
.	O
</s>
<s>
HPS-106	O
,	O
air	O
&	O
surface	O
search	O
radar	B-Application
,	O
for	O
the	O
Kawasaki	O
P-1	O
maritime	O
patrol	O
aircraft	O
,	O
three	O
antenna	B-Algorithm
arrays	I-Algorithm
.	O
</s>
<s>
DRDO	O
LSTAR	O
-	O
Radar	B-Application
for	O
Airborne	O
Early	O
Warning	O
platform	O
.	O
</s>
<s>
The	O
first	O
AESA	B-Architecture
radar	I-Architecture
employed	O
on	O
an	O
operational	O
warship	O
was	O
the	O
Japanese	O
OPS-24	O
manufactured	O
by	O
Mitsubishi	O
Electric	O
introduced	O
on	O
the	O
JDS	O
Hamagiri	O
(	O
DD-155	O
)	O
,	O
the	O
first	O
ship	O
of	O
the	O
latter	O
batch	O
of	O
the	O
Asagiri-class	O
destroyer	O
,	O
launched	O
in	O
1988	O
.	O
</s>
<s>
APAR	O
(	O
active	B-Architecture
phased	I-Architecture
array	I-Architecture
radar	B-Application
)	O
:	O
Thales	O
Netherlands	O
 '	O
multifunction	B-Architecture
radar	I-Architecture
is	O
the	O
primary	O
sensor	O
of	O
the	O
Royal	O
Netherlands	O
Navy	O
's	O
De	O
Zeven	O
Provinciën	O
class	O
frigates	O
,	O
the	O
German	O
Navy	O
's	O
Sachsen	O
class	O
frigates	O
,	O
and	O
the	O
Royal	O
Danish	O
Navy	O
's	O
Ivar	O
Huitfeldt	O
class	O
frigates	O
.	O
</s>
<s>
APAR	O
is	O
the	O
first	O
active	B-Architecture
electronically	I-Architecture
scanned	I-Architecture
array	I-Architecture
multifunction	B-Architecture
radar	I-Architecture
employed	O
on	O
an	O
operational	O
warship	O
.	O
</s>
<s>
Road-mobile	O
"	O
Anti-Stealth	O
"	O
JY-26	O
"	O
Skywatch-U	O
"	O
3-D	O
long-range	O
air	O
surveillance	O
radar	B-Application
.	O
</s>
<s>
AN/SPY	O
-6	O
Air	O
and	O
Missile	O
Defense	O
Radar	B-Application
(	O
AMDR	O
)	O
multifunction	B-Architecture
radar	I-Architecture
for	O
U.S.	O
Arleigh	O
Burke	O
destroyers	O
,	O
</s>
<s>
CEAFAR	O
a	O
4th	O
generation	O
,	O
S-Band	O
multifunction	O
digital	O
active	B-Architecture
phased	I-Architecture
array	I-Architecture
radar	B-Application
,	O
installed	O
on	O
all	O
RAN	O
ANZAC	O
class	O
frigates	O
.	O
</s>
<s>
Ashwini	O
LLTR	O
Radar	B-Application
-	O
4D	O
AESA	B-Architecture
radar	I-Architecture
(	O
used	O
by	O
Indian	O
Air	O
Force	O
)	O
.	O
</s>
<s>
Arudhra	O
Radar	B-Application
-	O
Multi	O
function	O
AESA	B-Architecture
radar	I-Architecture
(	O
used	O
by	O
Indian	O
Air	O
Force	O
)	O
.	O
</s>
<s>
Swordfish	O
Long	O
Range	O
Tracking	O
Radar	B-Application
-	O
Target	O
acquisition	O
and	O
fire	O
control	O
radar	B-Application
for	O
Indian	O
Ballistic	O
Missile	O
Defence	O
system	O
.	O
</s>
<s>
Air	O
Defence	O
Tactical	O
Control	O
Radar	B-Application
(	O
ADTCR	O
)	O
-	O
Tactical	O
control	O
radar	B-Application
.	O
</s>
<s>
Atulya	O
Air	O
Defence	O
Fire	O
Control	O
Radar	B-Application
(	O
ADFCR	O
)	O
-	O
X-band	O
,	O
3D	O
Fire	O
control	O
radar	B-Application
.	O
</s>
<s>
RAWL-03	O
-	O
Multi	O
Function	O
Active	B-Architecture
phased	I-Architecture
array	I-Architecture
Air	O
Surveillance	O
Radar	B-Application
.	O
</s>
<s>
Naval	O
Missile	O
Defense	O
Radar	B-Application
(	O
NMDR	O
)	O
-	O
S-Band	O
Multi	O
Function	O
Active	B-Architecture
phased	I-Architecture
array	I-Architecture
Radar	B-Application
.	O
</s>
<s>
Air	O
Defence	O
Fire	O
Control	O
Radar	B-Application
System	I-Application
-	O
3D	O
surveillance	O
radar	B-Application
.	O
</s>
