Method and arrangement for determining location and/or speed of a moving object and use of the arrangement

An arrangement for determining a location and/or speed of an object configured to move along a controlled trajectory in a magnetic field deflected by a static and/or dynamic change, the arrangement comprising a measuring device measuring at least the magnetic field acting on the object in its different locations, the measuring device being fitted in connection with the object, and comprising at least measuring means, which comprise at least means for measuring the magnetic field, from the measuring data received from the means for measuring the magnetic field, a magnetic footprint describing the magnetic field acting on the object in its different locations being formed, the magnetic footprint being configured to be recorded in a memory of the arrangement for later use,

• wherein
• the arrangement comprises means for performing an initialization before actual operation or during operation of the object when moving the object on the controlled trajectory and by measuring at points determined by either time and/or position on the controlled trajectory the magnetic field acting on the object with the means for measuring a magnetic field and by recording the measurement results obtained in the memory of the arrangement as magnetic footprints,
• in addition to the means for measuring a magnetic field the arrangement comprises optional additional measuring means for measuring other sensor data of the object in its environment at that moment and/or the time used data, and means recording measurement results obtained from the optional additional measuring means in the memory of the arrangement,
• the arrangement also comprises means for fixing the location information of an object formed from the measurement results obtained at the aforementioned points determined by either time and/or position on the aforementioned controlled trajectory, and optionally the time information connected to the location information, to the aforementioned determined measuring locations of the controlled trajectory,
• during operation of the object the movement of the object is arranged to be measured with the same means for measuring a magnetic field as during the initialization, and optionally with the same optional additional measuring means as during the initialization, and the measurement results obtained are arranged to be compared to the time information and location information formed from the measurement results recorded in the memory of the arrangement during the initialization and recorded in the memory, and
• wherein the arrangement is configured to determine locations of the object during the operation and detect changes occurring in the operation in relation to location, motion state and condition of the object by comparing real-time measurement results obtained during operation of the object to the optimal sensor data formed from the measurement results recorded in the memory during the initialization.