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For tn ainglo plane oun-aynnclnmnmn wbit
conotallation, mooting tho dloni~n critorh
diocucanod Ln 3.1.1., tho ncce-nbhla Broa
from tho oitallite pacaoo in vioibili.:y of
a data rascaiving otstion ham boon
paraDotrically evaluatod for n nininurn
olevation angle above tho horlnon of 5'.
It DUO^ bo noted that tho ~bovo aroa can
be ~XXCIR~Q~ two times per doy and ~ Q P
orbit @ono: aultipla orbital planoo
conntollationo will increaoa Lhe dayly
nurabor of such *events*. Tablo 5i1.2.
shown tho nunbor of uoofull oatellito
passoo and total accsssibldl arm vo. Orbit
sltitudlo. Tb. total availeblo Bccors tine
is botwoon ~430 to 3100 SOC., ~por *ovcnte,
during which 500 to 600 imagoQ, typic':aliy
30 by 30 kn wido, could be uado 8vai:able
to tha data station. Such vsluaa may,
obviouoly, ba reduced dua to real-time
ground processing limitationo.
-
Orbit Wumbor of Acceeoible Total
altitudo satellite area access
(W) pasoes (10.6 Ita-2) time(s)
268 10 4.9 2500
362 9 7.6 to
460 7 9.8 3100
Table 5.1.2. Direct transmimion to ground
miusion related porformance
5.2. Data transmission v i a m& Rels]L
SatellitQQ
For atmtopic observations ovor sites not
in diroct visibility of ground atatlone,
tho uno of a D M network will bo a costeffectiva
and performant nolution. Our
studio8 have shown that , in vim of the
severa lightsate volumo Qnd ma00
limitations, Inter-Orbit Link0 should
preferably be carried out nt 60 CHz.
Efficient coding scheme3 provldlng > 4 dB
coding gain moot also bo used to further
decroaoo antenna size snd power
requitomants on both user tonainal and
Data Relay Satellite. The DE3 repeater
will Lsature onboard donodulationremodulation,
while decoding io performed,.
on ground.
*: 8 dB
POnoVQ1 during ground proceasing will be
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onaior. Undlor thooe aooumptions, a 0.1'
Table 5.2.1. Data trGofor to grround via ottitudo omor !- roll control and lees
Data Relay Satellitote
than 0.08' in pitch and yaw control can be
met as reasonable goal..
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