Table 3.

FDIR hierarchy.

FDIR FDIR reacting FDIR monitors and events FDIR recovery action
level instance
Level 5 Ground Ground monitors Ground executes CPRPs to recover spacecraft operation and resume nominal operations

Level 4 OBCreconfiguration HW generated alarms to RM RM switches to redundant PM and survival mode
module (RM)

Level 3 CSW CSW generated alarms to RM – RM reboots PM (Ops alarm)
– RM switches to redundant PM (SW alarm) and survival mode

Level 2 CSW CSW monitors on platform subsystems/payload/units: – Subsystem/unit reconfiguration
– Subsystem fail-operational monitors – Platform/Payload unit redundancy switching performed by CSW
– Unit fail-operation monitors
– Payload fail-safe monitors

Level 1 Platform unit Platform unit FDIR monitors: Recovery performed internally by
– HW with/without functional impact platform unit (no need of action by CSW)
– Built-in tests
– Intelligent unit SWwith/without functionalimpact

Level 1 Payload unit Payload unit FDIR monitors: Recovery performed internally by
– Intelligent unit SW payload (no need of action by CSW)
– Internal monitoring

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