<s>
Digital	B-Algorithm
antenna	I-Algorithm
array	I-Algorithm
(	O
DAA	O
)	O
is	O
a	O
smart	O
antenna	O
with	O
multi	O
channels	O
digital	O
beamforming	O
,	O
usually	O
by	O
using	O
fast	O
Fourier	O
transform	O
(	O
FFT	O
)	O
.	O
</s>
<s>
The	O
development	O
and	O
practical	O
realization	O
of	O
digital	B-Algorithm
antenna	I-Algorithm
arrays	I-Algorithm
theory	O
started	O
in	O
1962	O
under	O
the	O
guidance	O
of	O
Vladimir	O
Varyukhin	O
(	O
USSR	O
)	O
.	O
</s>
<s>
Limitations	O
on	O
the	O
accuracy	O
of	O
estimation	O
of	O
direction	B-Algorithm
of	I-Algorithm
arrival	I-Algorithm
signals	O
and	O
depth	O
of	O
suppression	O
of	O
interferences	O
in	O
digital	B-Algorithm
antenna	I-Algorithm
arrays	I-Algorithm
are	O
associated	O
with	O
jitter	O
in	O
ADCs	O
and	O
DACs	O
.	O
</s>
<s>
Technical	O
advances	O
in	O
GPU	B-Architecture
computing	I-Architecture
have	O
begun	O
to	O
narrow	O
this	O
gap	O
and	O
make	O
real-time	O
Capon	O
beamforming	O
possible	O
.	O
</s>
<s>
The	O
important	O
trend	O
in	O
evolving	O
digital	O
signal	O
processing	O
for	O
DAA	O
is	O
the	O
use	O
of	O
Artificial	B-Application
Intelligence	I-Application
technologies	O
.	O
</s>
<s>
DAA	O
was	O
implemented	O
in	O
a	O
big	O
lot	O
of	O
sonars	B-Application
and	O
medical	B-Application
ultrasound	I-Application
sensors	O
.	O
</s>
