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Being able to quickly identify anomalous behaviour allows to reduce downtimes and keep our spacecraft healthy. The current approach built in our Mission Control System is to use out-of-limits checks. However, many behaviours are anomalous even if they are within limits. Novelty detection is a new monitoring paradigm that allows to detect unusual behaviours in telemetry parameters. Unusual behaviour is usually a signature of anomaly in their way to develop. The novelty detection monitoring approach requires very little engineering knowledge as it learns from given examples of nominal behaviour. It also features very seldom false alarms and is complementary to the out-of-limit paradigm.
The Novelty Detector has been validated with Venus Express, XMM and Cryosat2 anomaly cases. The Novelty Detector managed to detect the anomaly way before the out of limits checks did. In some cases, these anomalies were not even detected by the out of limits. Flight Control Engineers check the Novelty Detection results daily as part of their monitoring tasks.