A method for eliminating interference signals, in an intermediate space, caused by interference sources disposed in the direct vicinity of the sensors of a multi-channel measuring device, the method comprising the steps of: - measuring signals using at least one magnetic sensor, - reconstructing the signal components originating from the inside and outside of the set of sensors based on the measured signals using the Signal Space Separation method, wherein in the SSS method, a magnetic field that was registered using a multi-channel measuring device is analysed in a geometry in which the interesting source is disposed in measurement volume V1; the sensors measuring the field or the components thereof in volume V2 outside volume V1; and the sources of the magnetic interferences as well as compensating actuators in volume V3 outside volume V1 and volume V2, which volume V3 can be infinite; wherein the SSS method comprises the steps of: - parametrising the magnetic field produced by the interesting sources disposed in volume V1 in volume V2 as a sum of elementary fields, each of them being irrotational, sourceless and finite outside volume V1 so that a presentation of a desired accuracy is achieved for the parametrised magnetic field in volume V2; - parametrising the sum magnetic field produced by the interference sources and the compensating actuators disposed in volume V3 in volume V2 as a sum of elementary fields, each of them being irrotational, sourceless and finite outside volume V3 so that a presentation of a desired accuracy is achieved for the parametrised magnetic field in volume V2; - calculating the measuring device's signal vector corresponding to each elementary field; and - separating the fields produced from sources disposed in different volumes by calculating the components of the measured signal vector in the basis formed by the signal vectors associated with the elementary fields. characterised in that the method further comprises the steps of: - comparing the reconstruction result of the inside to the reconstruction result of the outside; - recognising the aforementioned interference signals by the fact that they cause a signal component to the reconstruction result of both the inside and outside; and - eliminating the recognised interference signals in the intermediate space from the measured signals. - measuring signals using at least one magnetic sensor, - reconstructing the signal components originating from the inside and outside of the set of sensors based on the measured signals using the Signal Space Separation method, wherein in the SSS method, a magnetic field that was registered using a multi-channel measuring device is analysed in a geometry in which the interesting source is disposed in measurement volume V1; the sensors measuring the field or the components thereof in volume V2 outside volume V1; and the sources of the magnetic interferences as well as compensating actuators in volume V3 outside volume V1 and volume V2, which volume V3 can be infinite; - parametrising the magnetic field produced by the interesting sources disposed in volume V1 in volume V2 as a sum of elementary fields, each of them being irrotational, sourceless and finite outside volume V1 so that a presentation of a desired accuracy is achieved for the parametrised magnetic field in volume V2; - parametrising the sum magnetic field produced by the interference sources and the compensating actuators disposed in volume V3 in volume V2 as a sum of elementary fields, each of them being irrotational, sourceless and finite outside volume V3 so that a presentation of a desired accuracy is achieved for the parametrised magnetic field in volume V2; - calculating the measuring device's signal vector corresponding to each elementary field; and - separating the fields produced from sources disposed in different volumes by calculating the components of the measured signal vector in the basis formed by the signal vectors associated with the elementary fields. - comparing the reconstruction result of the inside to the reconstruction result of the outside; - recognising the aforementioned interference signals by the fact that they cause a signal component to the reconstruction result of both the inside and outside; and - eliminating the recognised interference signals in the intermediate space from the measured signals.