Enhanced telemetry monitoring with novelty detection

Abstract

Typically, automatic telemetry monitoring in space operations is performed by out-oflimits (OOL) alarms. This approach consists of deining an upper and lower threshold so that when a measurement goes above the upper limit or below the lower one, an alarm is triggered. We discuss the limitations of the out-of-limits approach and propose a new monitoring paradigm based on novelty detection. The proposed monitoring approach can detect novel behaviors, which are often signatures of anomalies, very early - allowing engineers in some cases to react before the anomaly develops. A prototype implementing this monitoring approach has been implemented and applied to several ESA missions. The operational assessment from the XMMNewton operations team is presented.