station conventionally it has a peak when the tag passes through the equatorial plane of the antenna of the reading station for stationary tags the rssi level of the response signal is more variable certain stationary tags called u201c easy u201d have a rather stable response signal without an rssi peak these tags are easy to discriminate other stationary tags called u201c difficult u201d can have at a given moment an rssi curve substantially similar to that of a moving tag because of constructive interference the presence of difficult stationary tags is frequent in indoor environments inside a building these constructive interference phenomena are random phenomena therefore this means that if this phenomenon appears at a reading point the probability of it also occurring at another reading point is low for this reason according to some embodiments using at least two reading points along the path of the moving tags is proposed in order to carry out a first filtering of the tags that are only read by one reading station this allows a portion of the difficult stationary tags having a response signal that should not normally be read by the reading stations but which via a phenomenon of constructive interference respond to one of the reading stations to be initially filtered then a shape recognition method for example knn k nearest neighbours 39 method is applied to the tags read by both reading stations in order to discriminate among the remaining tags between the moving tags and the stationary tags fig1 shows a flowchart of the method of some embodiments according to a first step of some embodiments labelled e 1 two remote reading stations.