Page 14 - test

Ref : CM-DFH4-2014-1
BEAZLEY Issue : 1

DFH 4 Series Spacecraft Date : 28 Sept 2014
Page 12 of 38

6. LAOSAT DFHS-4S SPACECRAFT TECHNICAL ASSESSMENT

Loasat-1 Observation Comment /Assessment Cri
 The customer is the Ministry of Posts and  Classical
telecommunications. The spacecraft is a DFH
4S, type with a Ku and C band payload.
Launch date Nov. 2015, OML 15 years. Bus
100Volts
 The spacecraft is a typical medium size type,  Classical.with the exception of the Li Ion battery
with Li ion batteries, the payload is not too
complex. Mass: 4000 kg, dry mass 1590 kg
Overview Power: 7800 W. .
 Module arrangement (service module and  Classical, central cylinder, U shape with N
payload) South, earth panel and antenna feed on the top
floor.
 Most of the hardware is under the  But some key equipment are subcontracted
responsibility of CAST, some items are outside China (IRES,Wheel,TWT,/TWTA
subcontracted. MIMU etc… What is the visibility they have on
them?
 Rockwell Collins RW, RWE  Most of the subcontractors are located in
 Galileo IRES Europe, except COMDEV where it is not stated
 Thales Alenia Space ETCA PCU if it is COMDEV Europe or COMDEV Canada
Major  COMDEV RF Switch, Isolator, Load, or COMDEV China or other, which nay have
Subcontractors Circulator some special rules for export control.
 Thales Alenia Space Ku & C band Receive  The strategy to flow down requirements and
MPM, TWT... monitors the subcontractors is not defined.
 Who is manufacturing the WG?
 8 54 MHz channels powered by 10 for 8  Classical Architecture. But not too much
Radiative TWT (143 W)? detailed are given on the equipments and on the
Ku Band  One (1) Rx/Tx deployable single offset antenna evolution of these equipment since they have
payload for c-band (West Panel) been qualified
 With the information provided, the EIRP
and G/T and coverage performances seems
to be compliant with the requirements
 14 36 MHz channels powered by 18 for 14  Classical Architecture. Question mark on the
TWT (75 W). Two TWTA used for OMNI past history (Ground and in Orbit qualification)
during launch for the 75 W TWT
C Band
payload  One (1) Rx/Tx deployable Gregorian antenna No comment at this stage
for Ku-band (East Panel)
 With the information provided, the EIRP and No comment at this stage
G/T nad coverage performances seems to be
compliant with the requirements.
 Mass budget, no comment
 Propellant budget, no comment
 Power budget, no comment.  Non thermal prediction given. Lack of FDIR
 SPF list should be updated to assess the risk
System  TCR Link budget, no comment  Coherence between all the various budgets as
budgets given for each satellite shall be reviewed and
 Antenna pointing accuracy, no comment
explained when different
 Reliability, 0.7688 end of life, seems optimistic
with the TWT redundancy proposed.
 SPF list (page 44), seems incomplete, many
other SPF can be added.

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