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2s-a
The paylord concept is distinctly diffmowtt front typical
"dud UM- approcxhco. Rather Ihw chEaahp n mum LRnc
CM he wed only for P single purport by "&id w s " (ia..
t:loud imaginc for DoD and civil d a ) . Qb goa[gmm will
develop dvmccd ~ ~lol uxhnology dapcfda U) mnltiple
plrp0-a by muldipl. usm.
SgmiTic t esW a%$xJvao m L#
Dove: '8 and apace.qualify an advanced.
multiopced. remota payload for small
satellit6o;
-trona mh.mimim wage of ATSSB for
.mina pyb& in tow earth orbil; md
!&vel& aid dmonrttnta Common Data Link
(CDL) s ~ i d - d ~Anology fa mall satellites
end dimst dormlinlt comw4vity to mobile earth
taminmls.
OIlr first Ectivity W(U IO identify Ihe DDD and civil remote
tensing requirements and needs that could bc met best by a
multispcclrd paylocd. EIistinC DoD requirements urd
mensurmrenrt rarcds mmcintcd with civil programs such U
Lartcdan~, NASA's Earth ObPming System (EOS) and the
Strotegic Environmental Research and Gevelopment
Progm wew nrweycd, from which emerged clcu area of
ovnlop in qwc~rol coverage. spectral resolution. etc..
hat indicate mmy rcguiremenll could h ~ddresscd using
an intogratad multisgsctral payload. The requirements
frrr.cwmk wu U& lo &fine llw general churctcristia of
a paylord d m in-how atudy wm conducied to define I
point desion. This design proved feasihle for
implrmentotion a mall sokllita payload on h e ATSSB.
runent gmogrfun plan cd!s for system development
rwuistent with m FYW launch.
Tk first mo swvcyed w u climnlc rcscuch. The highest
piority memwemmu for detecting and charactcrixirig the
global climats change liana1 and the pattern of this
chanp hove ben well uticulsled by Ihe U.S. Global
~ a n memuch ~ e propam and many individual pcientista
uuch M U?. Jim D~anasn. Dirtcta of NASA's Coddard
htitutc for S~OCC Studies. The core nieasurcment
requirement cocmiiol to chnractaiting Ihe climate sysiem
is long-term monitoring of Ihe cmths radiation budpet.
The00 measurements have not been mode for
~ X h O V ZIWQ l ~ yEI?PO d lpona We p\fUUWd befote he dqloymmt of 0 rdiation Waet rdiometcr on a Japnnere
mtellitc, in &a mid-199& SRd he f't EOS system in the
Iota 109%. Et is eomtiol to undrwtand mm'r impact on
the climate EYSkm. anthropgcnic climate forcings.
Spece mcnowemntn of rcroools. omc. water vrpr and
snsrfnce re9ectivity (albedo) am required. all of which. mi
pemt. m nnaaowd hcdquatcly or not measured at all.
hotly. the climate feedback mechanisms are poorly
understood nnd modald. It is eooeniisl to understand
whlher mm'o impact on he climate system results in
hfp? K P changer ~ (e.&. cloud cover) chat positively or
nqotively reidmca h d towd alobal warming. The
most important of ;hess requires detailed globrl
menrwacnta of clod polnre md prrcicle rim.
P), wcod IPDUMUP~~~I area CanaiQIcd is mvironmentd
quahy monitor@. inrludinn pornmeters such U air and
voter pllutioa hnacwdaws waste rite monitoring. wetlands
-
cad I d w mitorin EBEB rurvcillance of natural ud
mmm& dioatero for unerpicy response. Most of
&em pmamrltro Rave oilplatwe fearares hat emerge from
multiogtctrol mcosurcments. Although Landsat and
Sptem0 hoWm d'Gmaw~ion de la Tmr (5m have
cr9graod many of Ihaaa. heir rpctral bmdr were not
cphized U) w u m chan and heir spatial resolution is
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