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Gaia

GAIA.ASU.SP.ESM.00007

Issue 2.00

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GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc

1.3 Summary Description

The Avionics SCOE is used during various stages of Spacecraft build to allow testing of the Gaia Avionics

Subsystem in open-loop and closed-loop mode. It comprises the following test features:

Simulation and measurement of the AOCS Actuators.

Stimulation of the AOCS Sensors inputs.

Acquisition of data from the CDMU MIL-STD-1553B Data BUS (Payload and Service Module).

Simulation of data on the CDMU MIL-STD-1553B Data BUS (Payload and Service Module).

Acquisition of data on the CDMU-EIU SpaceWire BUS.

Simulation of data on the CDMU-EIU SpaceWire BUS.

Acquisition of data on the CDMU-PDHU PacketWire BUS.

Simulation of data on the CDMU-PDHU PacketWire BUS.

1.4 Gaia Test Benches

Using a model-based test philosophy, the following Test Benches are identified for Avionics SCOE usage:

• Avionics Model Bench (AVM) - see Figure 1.4-1.

• Spacecraft PFM AIT.

1.4.1 Avionics Model Bench

The AVM is a test bed built up from (as a minimum) the Spacecraft CDMU up to (eventually) a full set of

Spacecraft electronics units and associated harness.

In the AVM configuration, the Avionics SCOE is used to perform open-loop and closed-loop testing of the

Spacecraft Avionics.

For open-loop testing, the Avionics SCOE is controlled locally or from the CCS.

For closed-loop testing, the Spacecraft Interfaces provided by the Avionics SCOE are under the control of

the Real Time Simulator (RTS).

In this configuration, Test Procedures developed on the CCS during AVM testing are intended for use

throughout the Spacecraft AIT campaign.

Figure 1.4-1 shows a block diagram of the Gaia EGSE Configuration and the Avionics SCOE interfaces to

the Gaia Spacecraft and other EGSE.

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