Object tracking method, device, backend and medium

A backend of an object tracking device, comprising:

• a sensor array, for obtaining magnetic field data at a location of the sensor array as raw sensor data, wherein the sensor array comprises a plurality of magnetic field sensors;
• and
• a processor, communicatively connected to the sensor array, for determining if a target magnet is present based on the raw sensor data, and tracking, when the target magnet is present, the target magnet based on the raw sensor data;
• wherein the target magnet is a permanent magnet provided on a target object.

A permanent-magnet-based object tracking device, comprising:

• at least one target magnet, to be provided on a target object, wherein the target magnet is a permanent magnet;
• a backend, comprising a sensor array and a processor, wherein
• the sensor array is used for obtaining magnetic field data at a location of the sensor array as raw sensor data;
• and
• the processor is communicatively connected to the sensor array, for determining if the target magnet is present based on the raw sensor data, and tracking, when the target magnet is present, the target magnet based on the raw sensor data.