The spacecraft system specification defines also the subsystems of the spacecraft e.g.:
- Data management subsystem incl. software
- Electrical Power
For each subsystem a subsystem specification is prepared by the Prime Contractor with the same specification structure shown above including references to the parent paragraph in the system specification. In the same way the subsystem contractor prepares an assembly or unit specification. All these specifications are listed in a so-called specification tree showing all specifications and their linkage as well as the issue / date of each specification.
Read more about this topic: System Requirements (spacecraft System)
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