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The instrumentation of real systems is often designed for control purposesand control inputs are designed to achieve nominal control objectives. Hence,the available measurements may not be sufficient to isolate faults withcertainty and diagnoses are ambiguous. Active diagnosis formulates a planningproblem to generate a sequence of actions that, applied to the system, enforcediagnosability and allow to iteratively refine ambiguous diagnoses. This paperanalyses the requirements for applying active diagnosis to space systems andproposes ActHyDiag as an effective framework to solve this problem. It presentsthe results of applying ActHyDiag to a real space case study and ofimplementing the generated plans in the form of On-Board Control Procedures.The case study is a redundant Spacewire Network where up to 6 instruments,monitored and controlled by the on-board software hosted in the SatelliteManagement Unit, are transferring science data to a mass memory unit throughSpacewire routers. Experiments have been conducted on a real physical benchmarkdeveloped by Thales Alenia Space and demonstrate the effectiveness of the plansproposed by ActHyDiag.

Applying Active Diagnosis to Space Systems by On-Board Control Procedures