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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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