Page 20 - test

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

DFH 4 Series Spacecraft Date : 28 Sept 2014
Page 18 of 38

7. CHINASAT 9 DFHS-4 SPACECRAFT TECHNICAL ASSESSMENT A LARGE NUMBER OF COMMENTS
PRESENTED ABOVE ON LAOSAT COULD BE REPEATED HERE

CHINASAT 9 Observation Comment /Assessment Cri
 The customer is China Satellite  Explain the meaning of former SINOSAT 4.
Communication (China Satcom). The
spacecraft is a DFH 4, Former SINOSAT 4.
type with a Ku payload. , with 24 active
unitsLaunch date Feb 2017, OML 15 years.
Bus 100 Volts, NiH2 batteries.
 The spaceraft is a typical medium size type,  Classical.
with NiH2 batteries; the payload is not too  It is assumed that the NiH2 battery for the required
complex. Mass: 5100 kg, dry mass 1974 kg capacity is well qualified and that the in orbit
Overview Power: 8900 W 2x 80 Ah. 2x 54 cells performance (with a similar DOD) demonstrate stable .
performance through time
 But failure detection and recovery which is a key issue is
not address in this document (like in all the other ones
 Module arrangement (service module and  Classical, central cylinder, U shape with N South and
payload) earth panel and antenna feed on the top floor.
 Most of the hardware is under the  Just a comment Evidence of their in Orbit qualification
responsibility of CAST, some items are shal be given
subcontracted.
Team  Page 3. Provide the responsibility of each  Here again team responsibles appear in other program
Organization Chief, Manager, and Directors. Who is such as Chinasat 18 and 16...
reporting whom? Who sign the specifications?
 Rockwell Collins RW, RWE, MW, MWE  Most of the subcontractors are located in Europe, except
 Galileo IRES COMDEV where it is not stated if it is COMDEV
 Thales Alenia Space ETCA PCU Europe or COMDEV Canada which nay have some
 COMDEV RF Switch, Isolator, Load, special rules for export control.
 Thales Alenia Space TWT  The strategy to flow down requirements and monitors
the subcontractors is not defined.
Major  NTS, SSPA  THALES Alenia space cannot be in charge of TWT, it
Subcontractors should be either THALES Velizy or ULM, in that case
who is in charge of the TWTA it seems that it is TESAT
(see page 51).
 Who is in charge of OMUXes, mechanism (deployment,
steerable antenna etc..) thermal (design and hardware),
WG.
 24 x36 MHz channels powered by two 15 for
12 LVTWTA (150 W)

Antenna it is assumed that the antennas are
shaped.
 Page 12. What is the margin taken for the
antenna? what is the pointing considered? 0.1
or 0.15G/T being in the design phase a
reasonable margin should be taken (0.1 dB/K is
low).  Some clarifications will help..
Ku Band  Page 9 ku Block diagram, where is the link  Antenna technology and qualification?
with the TCR subsystem.  Neither steerable antenna mechanism not described nor
payload  Page 14. Antenna configuration. A drawing its real qual status. Can they confirm that it is a real copy
showing more precisely the implementation of of was developed for chinasat 11?
the antennas and t hat the required field of view
for each antenna, IRES, Thruster TCR antenna
is verified (even for the worst case position of
the steerable antenna)

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