1. A device for classifying and discriminating an unknown target object, the device comprising: a transmitter configured to generate a time-varying primary magnetic field in the vicinity of the target object, which time-varying primary magnetic field inductively couples with the target object to generate a target object secondary magnetic field; at least one cooperative source to which the primary magnetic field is also inductively coupled, generating one or more respective cooperative source secondary magnetic fields, wherein the target object and the at least one cooperative source are inductively coupled via the target object secondary magnetic field and the one or more cooperative source secondary magnetic fields; and a receiver configured to measure a composite inductive response, which comprises a measurement of the inductive coupling of the target object and the one or more cooperative sources.