<s>
Enhanced	B-Algorithm
radar	I-Algorithm
positioning	I-Algorithm
is	O
a	O
proposal	O
for	O
a	O
position	O
fixing	O
system	O
in	O
maritime	O
navigation	O
,	O
based	O
on	O
radar	B-Application
navigation	O
.	O
</s>
<s>
It	O
is	O
the	O
automation	O
of	O
the	O
process	O
of	O
determining	O
own	O
position	O
by	O
means	O
of	O
radar	B-Application
fixing	O
,	O
using	O
a	O
multitude	O
of	O
objects	O
with	O
known	O
position	O
as	O
reference	O
.	O
</s>
<s>
The	O
navigation	O
radar	B-Application
of	O
a	O
ship	O
is	O
currently	O
considered	O
a	O
primary	O
position	O
verification	O
device	O
by	O
navigators	O
,	O
as	O
the	O
radar	B-Application
can	O
be	O
used	O
to	O
identify	O
conspicuous	O
objects	O
or	O
coast	O
lines	O
,	O
giving	O
range/bearing	O
to	O
objects	O
of	O
a	O
known	O
charted	O
position	O
.	O
</s>
<s>
If	O
a	O
radar	B-Application
target	O
-	O
and	O
thus	O
the	O
associated	O
range	O
/	O
bearing	O
of	O
a	O
conspicuous	O
object	O
-	O
can	O
be	O
automatically	O
correlated	O
with	O
the	O
known	O
position	O
of	O
that	O
object	O
in	O
an	O
automated	O
manner	O
,	O
radar	B-Application
can	O
be	O
upgraded	O
to	O
an	O
automated	O
positioning	O
system	O
-	O
or	O
position	O
verification	O
system	O
-	O
and	O
may	O
ultimately	O
function	O
as	O
a	O
terrestrial	O
back-up	O
option	O
for	O
satellite	O
positioning	O
(	O
GNSS	O
)	O
.	O
</s>
<s>
Enhanced	B-Algorithm
radar	I-Algorithm
positioning	I-Algorithm
is	O
achieved	O
through	O
the	O
continuous	O
automated	O
process	O
of	O
correlating	O
a	O
multitude	O
of	O
radar	B-Application
targets	O
with	O
a	O
list	O
of	O
known	O
objects	O
in	O
the	O
vicinity	O
of	O
a	O
vessel	O
,	O
with	O
known	O
position	O
.	O
</s>
<s>
Through	O
AIS	O
,	O
the	O
positions	O
of	O
surrounding	O
vessels	O
are	O
known	O
,	O
and	O
could	O
be	O
used	O
for	O
automated	O
correlation	O
with	O
radar	B-Application
targets	O
–	O
providing	O
a	O
position	O
verification	O
mechanism	O
.	O
</s>
<s>
AIS	O
AtoN	O
signals	O
–	O
or	O
dedicated	O
Application	O
Specific	O
Messages	O
or	O
information	O
contained	O
in	O
additional	O
chart	O
object	O
information	O
in	O
the	O
S-100	O
ENC	O
framework	O
–	O
could	O
be	O
used	O
to	O
identify	O
the	O
presence	O
of	O
conspicuous	O
,	O
fixed	O
or	O
floating	O
objects	O
,	O
that	O
are	O
suitable	O
for	O
radar	B-Application
reference	O
.	O
</s>
<s>
The	O
surveyed	O
position	O
of	O
a	O
fixed	O
AtoN	O
would	O
constitute	O
a	O
very	O
good	O
radar	B-Application
reference	O
with	O
high	O
accuracy	O
,	O
while	O
the	O
GNSS	O
position	O
of	O
a	O
floating	O
AIS	O
equipped	O
AtoN	O
would	O
constitute	O
a	O
less	O
reliable	O
reference	O
.	O
</s>
<s>
The	O
introduction	O
of	O
Enhanced	O
RACON	O
(	O
e-RACON	O
)	O
will	O
enable	O
radar	B-Application
based	O
positioning	O
that	O
does	O
not	O
require	O
an	O
á	O
priori	O
knowledge	O
of	O
own	O
position	O
and	O
heading	O
,	O
provided	O
that	O
the	O
position	O
of	O
that	O
e-RACON	O
is	O
known	O
.	O
</s>
<s>
This	O
will	O
enable	O
enhanced	B-Algorithm
radar	I-Algorithm
positioning	I-Algorithm
to	O
be	O
a	O
reliable	O
terrestrial	O
positioning	O
mechanism	O
,	O
truly	O
independent	O
of	O
GNSS	O
systems	O
and	O
their	O
vulnerabilities	O
,	O
in	O
areas	O
equipped	O
with	O
e-RACON	O
.	O
</s>
