Gaia
GAIA.ASU.SP.ESM.00007
Issue 2.00
Page 18 of 79
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GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc
3.6 Spacecraft Interface Requirements
The Spacecraft Interfaces provide the hardware I/O with the Spacecraft. All I/O interfaces to the Spacecraft
are summarized in Appendix A.
Individual I/O interfaces to the Spacecraft will be identified by unique Symbolic Name to be defined following
project kick-off.
The Symbolic Naming convention is derived from the Spacecraft EICD and is used as a common interface
definition for data transfer with the Real Time Simulator.
3.6.1 Spacecraft Power Simulation
The Gaia Spacecraft includes a Power Control and Distribution Unit (PCDU), which provides BUS power to
all other Spacecraft units using individual Latching Current Limiter (LCL) and Foldback Current Limiter (FCL)
modules, fed from a regulated power bus.
AVI-3043/CREATED/T
The Avionics SCOE (Set#1 only) shall provide simulation of the PCDU LCL outputs to allow
continued testing in the AVM Bench configuration when the PCDU may be missing.
AVI-4061/CREATED/I,R
To fulfil the output impedance requirements for LCL simulation identified in AVI-4054 the Power
Simulation facilities shall be provisioned in a separate rack for location close to the PCDU harness in
the AVM configuration.
AVI-2474/CREATED/T
The Avionics SCOE shall provide the following representative LCL outputs:
Note: Numbers to be supplied are sufficient to power all Spacecraft Units (including redundancy and
spares) during AVM bench testing. LCL outputs for heater control are not required.
LCL Type Current Limit Number
LCL Class A 1A 17
LCL Class B 2A 10
LCL Class C 3A 7
LCL Class D 5A 2
LCL Class E 8A 1
LCL Class F 10A 1
Total 38
Table 3.6-1: LCL Quantities
AVI-4020/CREATED/R
The Avionics SCOE supplier shall consider 2 types of Power Simulation:
• Type 1: Individual LCL output simulation provided by relay-switched and fused lines.
• Type 2: Individual LCL output simulation provided by simulation of the real Spacecraft
LCL circuits.
AVI-4236/CREATED/R
Type 1 Power Simulation shall be the included in the proposal baseline.
AVI-4237/CREATED/R
Type 2 Power Simulation shall be included as separately costed Option to the baseline proposal.
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