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Figuro 7. Pnybd Msaa Frmbno. Cunm Spokms
and Futt~n Gods
The p dmance requiremenu lor he ATSJCQ indude: ( I)
suppon to payloads of up to !MM lpounrnb ;requiring:
400.600 wmo of pnk power. (2) rhmo-anib nltitudc
canlrol. (3) atadarcl communicatim linlrm. (a) propulsion
for orbit rnaintmas\ce. nd (5) a three.yem oniaaion lifc.
The partla uill emphaoire Ihc UDC of c mmm industry
rtnndmds mal will be scalable to WFpoft OOOO-pnund
paybods with a revcn-year milrion life.
4.3 AStE@ QQlOOQO~rOlhn
This 1)AWPA.led joint DoD pronrnm iate~rotcs the
advanced EWF communications and satellits suhystcm
tcrhnoktgico urrdit Cevcbpmrnt m DARPA/W@ md flight
dcmonrtratco two experimental. lightweight. EllF small
satellites. T)M ~oals of he program MC to supprt the
joint DoD Global Surveillance and Communication
(CSBC) dcmonrtration objectives: I
Develop. space-quolily and transition lvlvnnccd
technologies IO support the mid- 1990's
. MILSATCORI modernization decision milestows
ud integrated CSBC demonstrations:
ASWSI the utility of small satellites IO: (1)
augment IPrp,cr backhnne sr.tcllitcs; (2) cnahlc M
cvolutionrrylalfordable approach to
MILSATCOM procurcment/maderniartion;
(3) provide quick reaction IW~C md specidixcd
communications ovpporc: md
Smc 111 m wquisitinn management t ctW rimed
at towering ccsu md redwing "time to mrkcr"
fa new srtcliitc systems.
The gwrd ptDflun approach cdis for Iha 6vakqment.
launch rid 8cmonstration of two technology ac%,0lites in
geosynchronous orbits. Satellite 1 incvatcs he
prototype ATSSB a d the Massachusetts Urnotiauie of
Tcchb8ylLincoln L.bauory-developsd EMF payload
I
4 '
2s-7
Figure I) shows IRr functional layout of he core payload.
Th corn of koa pnylodo is M EHF communications
pxkarJQ lhrl pvidea 32 MIL-STD-1582C LDR chmls
d two MILSITD-1810 MDR chnnrerls. The data rate fm
the LDW chnnnela io 75.960 bpr and for the MDR
chmnncls. 4.1-1638.0 kbps. The core EHF
communicatipna pnckagc will provide a variable
kcanwidth antenno ant wes a dichroic lens to support
bth uplink ~scd downlink with a single reflector. Two
earth covcrogm Promo nrm included. The payloads will
perform all riBnol paeeaoing rquired to maintain the
MIL-STD-1512C and MIL-STD-1810 transmission
formats. As a &sign gool. the pmylods will have a
dulcu dcsiun bu dbw early l~hrrolo~y uppoder. U well
00 scalability. for increased channel crpacity and ertra
8D0l beans.
Figure 8. ASTEC EHF Peybad
Thc technology ~ VMCCS goid U a rcsult of the ASTEC
technology demonstrations will greatly impact future
MlLSATCOM systems through the introduction of new
coyrbiliiies. incorporation of new advanced tcchnologies
and demonstration of new implemcntation altcrnatives
such t) small sotellitc mugmentotion. The ASTEC payloads
implement he following new MILSATCOM KIyiciv:
First on-orbit MIL-STD-1810 (EHF MDR),
capability
- Supports 4.8-1638.0 k b data transmission
- indudes four channels on Payload 1 and
eight ch.mwls on Prylod 2
Unprocessed (i.e., transponder). VHDR EHF
capability (Poylood 1 only)
- Supports rintillati~-rcsistant lclivcry of
widebad data Wkom rcmots k ations
- Supportr &U rnm wp to 274 Mhps from a
IO-foot, 500-watt transmit terminal. hough
cha AnEC VMDR WMS@~,
receive terminal
lo 2O-fOOt
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