Page 25 - test

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

DFH 4 Series Spacecraft Date : 28 Sept 2014
Page 23 of 38

8. CHINASAT 16 DFH S-4S SPACECRAFT TECHNICAL ASSESSMENT SOME COMMENTS GIVEN
ABOVE ARE ALSO APPLICABLE HERE

CHINASAT 16 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 S, Former SINOSAT 4.
type with a Ka payload. And a piggyback item
, with 24 active units Launch date 2017, OML
15 years. Bus 100 Volts, Li Ion batteries. Ion
thrusters.
 The spacecraft is a typical medium size type,  Classical. .
with Li Ion batteries, the payload is quite
complex. Mass: 4600 kg, dry mass 2066 kg
Overview Power: 8900 W
 Module arrangement (service module and  Classical, central cylinder, U shape with N South
payload) and earth panel and antenna feed on the top floor.
 Most of the hardware is under the  Just a comment
responsibility of CAST, some items are
subcontracted.
 Half of the hardware needs to be qualified..  The qualification of this hardware should /could
With some really new items like Li Ion reserve some surprises.
batteries. Ion thrusters, new units packaging
(several units reassembled in a single unit ...)
 Page 3. Provide the responsibility of each  Mister Zhou the program manager is also the Chief
Team Chief, Manager, and Directors. Who is designer on Chinasat 9 A;
Organization reporting whom? Who sign the specifications?  Need of a project Management plan giving the inter
relation between all the project
 Rockwell Collins RW, RWE, MW, MWE  Most of the subcontractors are located in Europe,
 Galileo IRES how is the visibility with these subcontractors and
 Chelton isolator, loads how they manage the export control requirements?
 NTS, SSPA, LNA & power supplier units.  The strategy to flow down requirements and
Major Receiver & Down converters monitors the subcontractors is not defined.
Subcontractors  TESAT RF switches  Who is the supplier of 490 N thrusters and what the
 TED, LCTWTA , TWT flight experience are.
 Who is in charge of OMUXes, mechanism
(deployment, steerable antenna etc..) thermal
(design and hardware).
 Forward link 26 channels (bandwidth 6608
Mhz) powered by two 2x 12 for 10 radiative
LVTWTA (100 W) and 8 for 6 receivers and
master LO.  The payload and antennas are quite complex and
new.
 Return link 26 channels (bandwidth 6608 Mhz)  Statement: Down converter can be modified by
powered by 8 for 6 conductive LWTA (50 W) removing LNA from the receiver, thus qualification
and 38 LNA.and 8 for 6 Down converters. of Ku band receiver can cover the verification of Ku
KaBand  Antenna they claim that the various items have band down converter. No need for qualification unit
payload been qualified on several programs, this is only manufactured for Ku band down converter. This is
a statement, a breakdown of the qualification
of each item will be usefull. The ADPME at the limit of unit qualification. For a standard
(commanding need to be qualified for Chinasat customer a qual model will be needed. Obviously all
16. the equipment should undergo a PFM test cycle
 Units qualified on other programs Ka-sat, Yasat and
 .What are the margin taken for the antenna? Hylas is one thing, but it should be proven that the
What is the pointing considered? What is the environment on other spacecrafts encompass the
pointing accuracy during station keeping. DFH 4S requirements.
 Stating that going from Ku band to Ka band is just a

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