Page 32 - test

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

DFH 4 Series Spacecraft Date : 28 Sept 2014
Page 30 of 38

CHINASAT 18 Observation Comment /Assessment Cri
 Mass budget,  EPS, mass is 615KG, what is behind this
colossal number?
 Propellant budget, no comment  No comment at this stage
 Power budget,.  !5 KW capability need to be demonstrated.
System  TCR Link budget, no comment  No comment at this stage
budgets
 Antenna pointing accuracy, no comment  No comment at this stage
 Reliability, 0.731 end of life, seems optimistic  No comment at this stage
with the TWT redundancy proposed.
 SPF list (page 26), seems incomplete, many  Should be updated later
other SPF can be added.
 Page 29-. According to the presentation most  It is understood that the entire payload will be
of the hardware is qualified, or flight proven. under TAS responsibility but the payload design
15.36 % of the hardware is in category C. This is still in preliminary phase, therefore it is
is addressing only the platform, what about the difficult to evaluate at this stage.
payload ?  Mechanical, electrical and thermal interfaces
 No unqualified technology; between CAST and TAS will be clearly defined
 No new design units; in the contract. Therefore it is premature to
 Platform Minor modification units, C evaluate it.
≈15.36%;
 Platform No modification units, D ≈  Page 48:. Many items have to be qualified (in
84.64%. 2014)

Qualification
status

 Page 39. Solar array manufacturer TIPS ? It  Seems to be a new design, qualification need to
seems that it is a new manufacturer be demonstrated.
(Qualification 09 2014) 4 panels.
 Page 41, not yet qualified2. Li Ion batteries cell  Experience on LEO is difficult to extrapolate on
45 Ah, bat 135 Ah GEO.
 Page 43. SADM, significant change,  Item at risk.
qualification end of 2014
 Page 50. Significant evolution in comparison  Comment see remarks on each subsystem
Platform with DFH-4 which need to be proven and
overview qualified.
 No détails provided  Some doubts on the capability to handle 15 KW.
Table 10-b Chinasat 18 technical assessment

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