<s>
Radiolocation	B-Algorithm
,	O
also	O
known	O
as	O
radiolocating	B-Algorithm
or	O
radiopositioning	B-Algorithm
,	O
is	O
the	O
process	O
of	O
finding	O
the	O
location	O
of	O
something	O
through	O
the	O
use	O
of	O
radio	O
waves	O
.	O
</s>
<s>
It	O
is	O
similar	O
to	O
radionavigation	O
,	O
but	O
radiolocation	B-Algorithm
usually	O
refers	O
to	O
passively	O
finding	O
a	O
distant	O
object	O
rather	O
than	O
actively	O
one	O
's	O
own	O
position	O
.	O
</s>
<s>
Radiolocation	B-Algorithm
is	O
also	O
used	O
in	O
real-time	O
locating	O
systems	O
(	O
RTLS	O
)	O
for	O
tracking	O
valuable	O
assets	O
.	O
</s>
<s>
The	O
radio	O
waves	O
may	O
be	O
transmitted	O
by	O
the	O
object	O
to	O
be	O
located	O
,	O
or	O
they	O
may	O
be	O
backscattered	B-Algorithm
waves	O
(	O
as	O
in	O
radar	B-Application
or	O
passive	B-Application
RFID	I-Application
)	O
.	O
</s>
<s>
A	O
stud	O
finder	O
uses	O
radiolocation	B-Algorithm
when	O
it	O
uses	O
radio	O
waves	O
rather	O
than	O
ultrasound	B-Application
.	O
</s>
<s>
The	O
angle	B-Algorithm
of	I-Algorithm
arrival	I-Algorithm
(	O
AOA	O
)	O
at	O
a	O
receiving	O
station	O
can	O
be	O
determined	O
by	O
the	O
use	O
of	O
a	O
directional	O
antenna	O
,	O
or	O
by	O
differential	O
time	O
of	O
arrival	O
at	O
an	O
array	O
of	O
antennas	O
with	O
known	O
location	O
.	O
</s>
<s>
Use	O
of	O
RSSI	O
to	O
locate	O
a	O
transmitter	O
from	O
a	O
single	O
receiver	O
requires	O
that	O
both	O
the	O
transmitted	O
(	O
or	O
backscattered	B-Algorithm
)	O
power	O
from	O
the	O
object	O
to	O
be	O
located	O
are	O
known	O
,	O
and	O
that	O
the	O
propagation	O
characteristics	O
of	O
the	O
intervening	O
region	O
are	O
known	O
.	O
</s>
<s>
Time	O
of	O
arrival	O
measurements	O
are	O
also	O
most	O
accurate	O
when	O
the	O
signal	O
has	O
distinct	O
time-dependent	O
features	O
on	O
the	O
scale	O
of	O
interest	O
—	O
for	O
example	O
,	O
when	O
it	O
is	O
composed	O
of	O
short	O
pulses	O
of	O
known	O
duration	O
—	O
but	O
Fourier	B-Algorithm
transform	I-Algorithm
theory	O
shows	O
that	O
in	O
order	O
to	O
change	O
amplitude	O
or	O
phase	O
on	O
a	O
short	O
time	O
scale	O
,	O
a	O
signal	O
must	O
use	O
a	O
broad	O
bandwidth	O
.	O
</s>
<s>
In	O
the	O
United	O
States	O
,	O
unlicensed	O
transmission	O
is	O
allowed	O
in	O
several	O
bands	O
,	O
such	O
as	O
the	O
902-928MHz	O
and	O
2.4-2.483GHz	O
Industrial	O
,	O
Scientific	O
,	O
and	O
Medical	O
ISM	B-Algorithm
bands	I-Algorithm
,	O
but	O
high-power	O
transmission	O
cannot	O
extend	O
outside	O
of	O
these	O
bands	O
.	O
</s>
<s>
Radiolocation	B-Algorithm
is	O
employed	O
in	O
a	O
wide	O
variety	O
of	O
industrial	O
and	O
military	O
activities	O
.	O
</s>
<s>
Radar	B-Application
systems	I-Application
often	O
use	O
a	O
combination	O
of	O
TOA	O
and	O
AOA	O
to	O
determine	O
a	O
backscattering	B-Algorithm
object	O
's	O
position	O
using	O
a	O
single	O
receiver	O
.	O
</s>
<s>
In	O
Doppler	B-Algorithm
radar	I-Algorithm
,	O
the	O
Doppler	O
shift	O
is	O
also	O
taken	O
into	O
account	O
,	O
determining	O
velocity	O
rather	O
than	O
location	O
(	O
though	O
it	O
helps	O
determine	O
future	O
location	O
)	O
.	O
</s>
<s>
Radiolocation	B-Algorithm
is	O
also	O
used	O
in	O
cellular	O
telephony	O
via	O
base	O
stations	O
.	O
</s>
<s>
CDMA	B-Protocol
networks	O
such	O
as	O
Verizon	B-Application
Wireless	I-Application
and	O
Sprint	O
PCS	O
tend	O
to	O
use	O
handset-based	O
radiolocation	B-Algorithm
technologies	O
,	O
which	O
are	O
technically	O
more	O
similar	O
to	O
radionavigation	O
.	O
</s>
<s>
Mobile	O
phone	O
users	O
may	O
have	O
the	O
option	O
to	O
permit	O
the	O
location	O
information	O
gathered	O
to	O
be	O
sent	O
to	O
other	O
phone	O
numbers	O
or	O
data	O
networks	O
,	O
so	O
that	O
it	O
can	O
help	O
people	O
who	O
are	O
simply	O
lost	O
or	O
want	O
other	O
location-based	B-Application
services	I-Application
.	O
</s>
<s>
Radiolocation	B-Algorithm
service	O
(	O
short	O
:	O
RLS	O
)	O
is	O
–	O
according	O
to	O
Article	O
1.48	O
of	O
the	O
International	O
Telecommunication	O
Union	O
's	O
(	O
ITU	O
)	O
Radio	O
Regulations	O
(	O
RR	O
)	O
–	O
defined	O
as	O
"	O
A	O
radiodetermination	O
service	O
for	O
the	O
purpose	O
of	O
radiolocation	B-Algorithm
"	O
,	O
where	O
radiolocation	B-Algorithm
is	O
defined	O
as	O
:	O
"	O
radiodetermination	O
used	O
for	O
purposes	O
other	O
than	O
those	O
of	O
radionavigation.	O
"	O
</s>
<s>
Radiolocation-satellite	O
service	O
(	O
short	O
:	O
RLSS	O
)	O
is	O
–	O
according	O
to	O
Article	O
1.49	O
of	O
the	O
International	O
Telecommunication	O
Union´s	O
(	O
ITU	O
)	O
Radio	O
Regulations	O
(	O
RR	O
)	O
–	O
defined	O
as	O
«	O
A	O
radiodetermination-satellite	O
service	O
used	O
for	O
the	O
purpose	O
of	O
radiolocation	B-Algorithm
.	O
</s>
<s>
For	O
example	O
military	O
radar	B-Application
sensors	O
in	O
earth	O
satellites	O
operate	O
in	O
the	O
radiolocation-satellite	O
service	O
n	O
this	O
service	O
.	O
</s>
<s>
In	O
order	O
to	O
improve	O
harmonisation	O
in	O
spectrum	O
utilisation	O
,	O
the	O
majority	O
of	O
service-allocations	O
stipulated	O
in	O
this	O
document	O
were	O
incorporated	O
in	O
national	O
Tables	O
of	O
Frequency	B-Algorithm
Allocations	I-Algorithm
and	O
Utilisations	O
which	O
is	O
within	O
the	O
responsibility	O
of	O
the	O
appropriate	O
national	O
administration	O
.	O
</s>
<s>
A	O
radiolocation	B-Algorithm
land	O
station	O
is	O
–	O
according	O
to	O
article	O
1.90	O
of	O
the	O
International	O
Telecommunication	O
Union	O
's	O
(	O
ITU	O
)	O
ITU	O
Radio	O
Regulations	O
(	O
RR	O
)	O
–	O
defined	O
as	O
"	O
a	O
radio	O
station	O
in	O
radiolocation	B-Algorithm
service	O
not	O
intended	O
to	O
be	O
used	O
while	O
in	O
motion.	O
"	O
</s>
<s>
Each	O
radiolocation	B-Algorithm
station	O
shall	O
be	O
classified	O
by	O
the	O
radiocommunication	O
service	O
in	O
which	O
it	O
operates	O
permanently	O
or	O
temporarily	O
.	O
</s>
<s>
Radiolocation	B-Algorithm
mobile	O
station	O
is	O
–	O
according	O
to	O
article	O
1.89	O
of	O
the	O
International	O
Telecommunication	O
Union´s	O
(	O
ITU	O
)	O
ITU	O
Radio	O
Regulations	O
(	O
RR	O
)	O
–	O
defined	O
as	O
"	O
A	O
radio	O
station	O
in	O
radiolocation	B-Algorithm
service	O
intended	O
to	O
be	O
used	O
while	O
in	O
motion	O
or	O
during	O
halts	O
at	O
unspecified	O
points.	O
"	O
</s>
<s>
Each	O
radiolocation	B-Algorithm
station	O
shall	O
be	O
classified	O
by	O
the	O
radiocommunication	O
service	O
in	O
which	O
it	O
operates	O
permanently	O
or	O
temporarily	O
.	O
</s>
