Sensor device and sensor system for monitoring a machine

A sensor system for monitoring a machine, the sensor system comprising:

• a plurality of sensor devices, each of the plurality of sensor devices comprising,
• at least one of a gyroscope sensor unit and an acceleration sensor unit,
• a radio interface which is configured to transmit data via a radio signal, and
• a distance determination unit which is configured to analyze a received radio signal and to determine, based on the received radio signal, an antenna distance to an antenna device from which the received radio signal was transmitted;
• and
• a position determination unit which is configured,
• to receive measurement data of the at least one of the gyroscope sensor unit and the acceleration sensor unit of at least two of the plurality of the sensor devices,
• to receive the antenna distance of the at least two of the plurality of the sensor devices, and
• to determine, based on the measurement data and the antenna distances provided, position data for the at least two of the plurality of the sensor devices which indicate a spatial position of the at least two of the plurality of the sensor devices relative to each other.