Method and device for detecting anomalies in sensor recordings of a technical system

An anomaly detection device configured to detect anomalies in a plurality of sensor recordings of a technical system, the device configured to:

• ascertain a first anomalous value which, with regard to all sensor recordings of the plurality of sensor recordings, characterizes whether or not an anomaly is present;
• ascertain a plurality of second anomalous values, each second anomalous value from the plurality of second anomalous values corresponding to a respective sensor recording of the plurality of sensor recordings, and with regard to the respective sensor recording characterizing whether or not an anomaly is present in other sensor recordings of the plurality of sensor recordings;
• detect an anomaly in a sensor recording of the plurality of sensor recordings when the first anomalous value characterizes the presence of an anomaly, and the second anomalous value corresponding to the sensor recording characterizes no anomaly, and the second anomalous value differs beyond a predefined extent from other second anomalous values of the plurality of second anomalous values.

A non-transitory machine-readable memory medium on which is stored a computer program for detecting anomalies in a plurality of sensor recordings of a technical system, the computer program, when executed by a computer, causing the computer to perform the following steps:

• ascertaining a first anomalous value which, with regard to all sensor recordings of the plurality of sensor recordings, characterizes whether or not an anomaly is present;
• ascertaining a plurality of second anomalous values, each second anomalous value from the plurality of second anomalous values corresponding to a respective sensor recording of the plurality of sensor recordings, and with regard to the respective sensor recording characterizing whether or not an anomaly is present in other sensor recordings of the plurality of sensor recordings;
• detecting an anomaly in a sensor recording of the plurality of sensor recordings when the first anomalous value characterizes the presence of an anomaly, and the second anomalous value corresponding to the sensor recording characterizes no anomaly, and the second anomalous value differs beyond a predefined extent from other second anomalous values of the plurality of second anomalous values.