<s>
The	O
Spaceborne	B-Algorithm
Imaging	I-Algorithm
Radar	I-Algorithm
(	O
SIR	O
)	O
–	O
full	O
name	O
'	O
Spaceborne	O
Imaging	O
Radar-C/X	O
-band	O
Synthetic	B-Application
Aperture	I-Application
Radar	I-Application
(	O
SIR-C/X	O
-SAR	O
)	O
'	O
,	O
is	O
a	O
synthetic	B-Application
aperture	I-Application
radar	I-Application
which	O
flew	O
on	O
two	O
separate	O
shuttle	O
missions	O
.	O
</s>
<s>
SIR	O
utilizes	O
3	O
radar	O
frequencies	O
:	O
L	B-Algorithm
band	I-Algorithm
(	O
24cm	O
wavelength	O
)	O
,	O
C	B-Algorithm
band	I-Algorithm
(	O
6cm	O
)	O
and	O
X	B-Algorithm
band	I-Algorithm
(	O
3cm	O
)	O
,	O
allowing	O
for	O
study	O
of	O
geology	O
,	O
hydrology	O
,	O
ecology	O
and	O
oceanography	O
.	O
</s>
<s>
C-band	B-Algorithm
beamwidth	O
=	O
0.25	O
deg	O
.	O
</s>
