0 - FTP Directory Listing - Nato

274
The outhe cdmcept of a SAR mounted
on such a9 toroidal platform is presented in
Figure B. B~d~ets showing the mass and
power demands likely to be associated
with such a satellite are presented in
Table 3.
nee ckthet options 0f S M design can
be envisa ed QS provide a tactical
apabdity. i7 n order of rising complexi
these options include, rnsshanica$
steered system usin a single centrzl hi
power amplifier ( h PA), electronica
steered systems Pike RADARSAT whic
iiie a single cenurd HPA and ferrite phase
shifters for beam deflection, and
c.lectrslQicalP steered systems like the
Eu~ogeim A AI2 which use fully active
hased array technology to provide
ad Spotlight operating modes.
Of these fundamental design options, two
were considered as candidates for
dli~~~ssic~n in this paper, a partial phased
array grddin electronic steerin only in
the azimuth cf iaection and a ful P y\active
phased may providing both azimuth and
elevation steering.
"he case of the potential1 simpler, partial
evauon steering
is provided only by mechanical pointing
was considered, but it was concluded that
because the Pime taken to mechanically
int the s tern would be on the order
'"p" o minute& P F Q number of useful Spotlight
ima@wg opporaannMes available to the
Theartae Co.wder would be limited to
a rather smdi inumber. When this number
is corn area0 wiahtn uhe much larger number
of SMC YI ogpo~a~noitia potentially made
aslilabk f~om a PUUy active phased may,
@.sed may where the e r
there appeared to be 8 strong case in