0 - FTP Directory Listing - Nato
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0 - FTP Directory Listing - Nato
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Vlrtbl~ D~tect~n<br />
b Rows of 18um quam dmtocton, doubb oWu( mwr, -0gaO bna<br />
1 Row of 10um quam delacton, dwbh oHW( row, 6m(<br />
IR D.hclom *' 1<br />
2 Row 01 Wum quam oatulon, doubb 0ffl.C row& -3OOO lo&' '<br />
3 Row of 1Wum qwn G Mulon, doubh off.* row. -1- long<br />
Each row cowmd by.pproprf.1. fllhn<br />
FigllrC I2 M~lri-Sp~~ml Focrl Plphe<br />
shows he mulii-spcvrl Focal Plane Array (FPA)<br />
layouL A lhcrd irolacor divides Ihc FPA into an<br />
unroolcd visual and cooled (EO OK) IR waveband<br />
scctiau. Film IO define the dcmwd wnvcband cowl<br />
$4 ~rcd-atignment<br />
the dclccm in aEh p r<br />
rows,<br />
with multiabr dam miva! lutomlticrlly as he rows<br />
svcep rmn the sccnc. l'hc FPA kngth will lil ely<br />
nquh lllc ad Jignmat of scparatc mJk line umy<br />
rcctions combined lo lorn the FPA. Signal-hnoise<br />
rnlio lnalyris of a MIM IO bc imaged a mappcd must<br />
account fa Ihs obsrrvcr's desired COIVISI level.<br />
Backgmund noise nlhcr than internal sensor noise<br />
limiu TWSU mapping observations. This is bcuue<br />
Ihc unh is bright in most wavebands, upcially Ihe<br />
sunlit hall. The result is thc panbolif relation of<br />
contra to photon count. Since detectable convast<br />
depends on photon count. for background-limird<br />
dc~tion Ihe relation btwcen CO~IUSI level. required<br />
SNR. M me, rd rpean( bandwidth, is<br />
1 PAYLOAD I<br />
ON-GIMBAL I GIMBAL OFF-GIMBAL<br />
Vlslble<br />
Thermal<br />
Isolator<br />
IR<br />
31-7<br />
Conwan 9 SNR8(Scan Raier5l(Sp. Bandwidthp.'.<br />
lhin hclps IO ehoosc bo acari nu, once be expeeccd<br />
lsrgct Md background rignnlurrs. Wnr search amas<br />
IIE Wi. A MmmMdnbk sensor allows operaions<br />
lpilaed U) iMnediu missicm rcquimnmu.<br />
SenJoc operalions could involve bi-directional whisk-<br />
kmm scans cwcring about a 14O-wide swath parallel<br />
U) he flight path at up to 45' lrom nadir. Desired<br />
gmund raolutions am challenging IO achieve ovcr he<br />
full FoV with a modaalc apcrIun, cspccially in be IR<br />
bands. and a widc field-of-view wih r-able and<br />
wcighl is noeded for lhuc mi.sions. Data downlink<br />
mm ~IC high lor mapping and suweilla~c missions.<br />
This molru it dillicult 10 pmasr ad reuirn data withii<br />
time unmrpinu. 'Ihesc reflect Ihe combination of widc<br />
covetage and modium resolution. If aucntion is limited<br />
0 a fm uepr. slower scan and d;lu mes am possible.<br />
Fiyn I3 shows the rensa block dipgram.
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