Specifications

Gaia
GAIA.ASU.SP.ESM.00007
Issue 2.00
Page 65 of 79
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GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc
4 CO-ENGINEERING ACTIVITY
Critical to the operation of the Avionics SCOE as a component of a distributed real-time system is the
interface to the Real Time Simulator (RTS).
The RTS subcontractor has been instructed to lead the design and development of this interface.
The critical requirements identified in this document towards the development of this interface are the
synchronisation of the RTS to the Avionics SCOE (defined in Section 3.5.2) and the actual interface itself
(defined in Section 3.8).
AVI-2907/CREATED/R
The Avionics SCOE subcontractor shall concentrate the early development activities of this project
towards these requirements.
AVI-2908/CREATED/R
At an appropriate time of this development, a co-engineering activity with the RTS supplier shall be
started (with the RTS supplier leading the task) to establish the criteria for successful implementation
of this interface.
AVI-2909/CREATED/R
The initial requirements of the co-engineering activity shall be to establish:
• A draft ICD defining the data transfer requirements between the RTS and the Avionics
SCOE.
• Suitable protocol and methods to transfer data between the RTS and the Avionics SCOE.
• Benchmark the expected data latency between the RTS Model I/O and the Avionics
Hardware I/O.
AVI-3846/CREATED/R
As an input to this first activity, the Avionics SCOE supplier shall produce an Avionics SCOE ICD
defining the SCOE to Spacecraft interface requirements.
AVI-2910/CREATED/R
At a later stage in the development (and as agreed by the two subcontractors) the co-engineering
activity shall perform an integration task between the RTS and the Avionics SCOE to verify the data
exchange between the systems and benchmark the expected final performance as a distributed real-
time system.
AVI-2914/CREATED/R
The integration task shall:
• Establish initial calibration values for RTS Model I/O to Spacecraft I/O.
• Finalise the ICD between the RTS and the Avionics SCOE.
On completion, the RTS ICD will come under the control of, and be issued by, Astrium Ltd as a document
which covers all aspects of the RTS interface.
AVI-2911/CREATED/R
Acceptance testing of the delivered Avionics SCOE shall include verification of the correct operation
of the Avionics SCOE integrated with the RTS.
AVI-2912/CREATED/R
As part of Astrium Ltd. activities towards integration of the overall Avionics Model test bench (AVM),
the Avionics SCOE subcontractor shall provide 6 weeks support to this task in parallel with the RTS
subcontractor.