ESA Document - Emits - ESA

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2.10.2.2.2 LEO assembly
HMM
Assessment Study
Report: CDF-20(A)
February 2004
page 113 of 422
The LEO Assembly task is in charge of all operations of the spacecraft composite until end of
assembly/start of commissioning.
The LEO assembly is concerned with integrating a new element into the transfer spacecraft
composite structure every 50 days over a timespan of 3.5 years. Each type of composite
component needs its dedicated team of specialists to look after. In addition there are highly
complex robotic operations to be conducted with the service platforms. To be able to do the
assembly in a minimum time, shift work is assumed during the commissioning periods.
The spacecraft composite does not support an early manned capability. The early EVAs (when
needed) are performed by the visiting Shuttle crew. The responsibility for these EVAs is
assumed to rest with the Shuttle operator.
The concept is to establish a dedicated operations infrastructure specialized in the assembly of
the transfer spacecraft. A hierarchical control infrastructure is proposed for the overall spacecraft
and the composite components geared to the changing characteristics of the built-up spacecraft
composite.
Operations Architecture:
LEO Assembly Flight Operations Team, consisting of:
• System Team
• Mission Planning Team (in control of launches and resources)
• Component Operations Teams (one team for each type of component)
• Workbench Operations Team
Industrial Support Team for LEO Assembly with system and subsystem experts (DHS, thermal,
power, mechanisms, AOCS etc.), responsible for the following teams:
• System Team
• Propulsion Stages MOI
• Propulsion Stages TMI
• Service platforms
• SM
• Airlock and Cupola
• PM Central Structure Items
• Habitation Module
• Launcher Interface
Mission Control System, consisting of:
• System mission control system
• Component mission control systems
Simulators, consisting of:
• System simulator (being able to represent the different stages of assembly)