<s>
Bio-radiolocation	O
is	O
a	O
technology	O
for	O
remote	O
detection	O
and	O
diagnostics	O
of	O
biological	O
objects	O
by	O
means	O
of	O
radar	B-Application
,	O
even	O
behind	O
optically	O
opaque	O
obstacles	O
.	O
</s>
<s>
Devices	O
based	O
on	O
this	O
method	O
are	O
called	O
bio-radars	O
.	O
</s>
<s>
is	O
sleeping	O
or	O
sitting	O
in	O
a	O
fixed	O
pose	O
)	O
modulation	O
of	O
bio-radar	O
signal	O
is	O
caused	O
mainly	O
by	O
respiratory	O
movements	O
(	O
0.2-0.5Hz	O
)	O
and	O
heart	O
and	O
superficial	O
arteries	O
pulsations	O
(	O
0.5	O
–	O
20Hz	O
)	O
.	O
</s>
<s>
The	O
amplitude	B-Application
of	O
thorax	O
surface	O
displacement	O
caused	O
by	O
respiratory	O
muscles	O
contractions	O
is	O
about	O
1cm	O
,	O
while	O
the	O
same	O
parameter	O
for	O
heart	O
beating	O
is	O
only	O
1mm	O
.	O
</s>
<s>
Recently	O
,	O
researchers	O
showed	O
that	O
heart	O
sounds	O
(	O
20	O
–	O
80Hz	O
)	O
with	O
an	O
amplitude	B-Application
in	O
the	O
micrometer	O
range	O
can	O
be	O
detected	O
,	O
too	O
.	O
</s>
<s>
At	O
present	O
,	O
commercially	O
available	O
bio-radars	O
are	O
aimed	O
at	O
the	O
detection	O
of	O
people	O
and	O
at	O
tracking	O
them	O
behind	O
buildings	O
or	O
other	O
obstacles	O
(	O
e.g.	O
</s>
<s>
There	O
are	O
also	O
bio-radars	O
,	O
used	O
by	O
rescuers	O
for	O
finding	O
people	O
under	O
building	O
debris	O
.	O
</s>
<s>
Bio-radar	O
can	O
be	O
used	O
in	O
sleep	O
medicine	O
for	O
sleep	O
apnea	O
syndrome	O
monitoring	O
in	O
adults	O
and	O
newborns	O
.	O
</s>
