A terminal for generating an electromagnetic field adapted to cooperating with at least one transponder when the latter enters its field and including an oscillating circuit adapted to receiving a high-frequency A. Therefore, axial movement of the first shaft or the second shaft can be allowed, while circumferential rotational movement and radial movement can be restricted. The distribution parameters that provide a best fit of the model distribution to the data are estimated using an Expectation Maximization algorithm that further includes a dynamic neighborhood thresholding that enables gating of a subset of the clusters present in the data.