Page 33 - test

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

DFH 4 Series Spacecraft Date : 28 Sept 2014
Page 31 of 38

CHINASAT 18 Observation Comment /Assessment C
ri
UPS  . 16 thrusters in two semi system  No details, no comments!
Subsystem  No details provided.
 Page 54. It seems that the OBC and ADCE are in 
cold redundancy. This is a concern in case of
failure on the nominal path, The redundant
configuration will not know the context of switch
ON. What about the patches loaded ? Implication
of the FDIR.
AOCS  
Subsystem Page 54, The powering DC/DC converter of the Difficult to evaluate.
subsystem is not provided.
 What is puzzling is that some design are refering  Need clarifications.
do DF4 and some other to DFH4S, therefore it is
difficult to really understand what is the
heritage..
 Is there an EDAC protection to correct soft errors  See comment on the left.
and prevent SEU effects?
Avionics  Page 55, See comments above.  See comments above.
Subsystem
 No details provides.  Cannot be evaluated with the present package.
 It will be good to know which cell type they are  See comment on the left.
using, thickness of the cover glass minimum
Solar Array distance between cells and max voltage between
adjacent cells. How the inner panel is populated.
 The BPBTA is not described.  See comment on the left.
 Deployment mechanism not described.  See comment on the left.
 Identical to the DF 4E  Difficult to assess/

EPS  Just a comment.
Subsystem  What is the fusing strategy? Where the fuses  See comment on the left.
are located (hopefully not inside each unit).
 

TC & R  TC & R subsystem same as Chinasat 16.  See comments on Chinasat 16.
Subsystem
Deployment  Solar array deployment and strategy for Just a comment.
Mechanisms deployment not addressed.. Antenna
deployment mechanism not described.
Table 10-c Chinasat 18 technical assessment

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