Method for identifying a subset of measurements comprising a measurement disturbed by a magnetic disturber, this method comprising: a) the emission of magnetic fields and the measurement of these magnetic fields with the aid of N monoaxial source/monoaxial transducer pairs so as to obtain a set of N real measurements, each real measurement of this set being obtained with the aid of a monoaxial source/monoaxial transducer pair being distinguished from the others by: • the position of the monoaxial source used to emit the magnetic field, or • the position of the monoaxial transducer used to measure the magnetic field, or • the frequency of the magnetic field, one of the monoaxial source and of the monoaxial transducer being tied to a mobile object and the other to the frame of reference in which the position of the object must be expressed, b) the construction of an estimation P i of the position of the object in the frame of reference on the basis of an observer O i involving only a subset M i of the N measurements, this observer O i being able to solve a system of equations in order to obtain the estimation P i using for this purpose only the subset M i of the N measurements, characterized in that the method also comprises: c) the estimation of the N measurements on the basis of the estimated position P i and of at least one direct model linking the position of the object to the set of N measurements, the direct model corresponding to a system of equations obtained by modelling the magnetic interactions between each of the monoaxial sources and each of the monoaxial transducers, and d) the determination whether or not this subset M i of measurements comprises a disturbed measurement by comparing the measurements estimated during step c) with the real measurements obtained during step a). a) the emission of magnetic fields and the measurement of these magnetic fields with the aid of N monoaxial source/monoaxial transducer pairs so as to obtain a set of N real measurements, each real measurement of this set being obtained with the aid of a monoaxial source/monoaxial transducer pair being distinguished from the others by: • the position of the monoaxial source used to emit the magnetic field, or • the position of the monoaxial transducer used to measure the magnetic field, or • the frequency of the magnetic field, one of the monoaxial source and of the monoaxial transducer being tied to a mobile object and the other to the frame of reference in which the position of the object must be expressed, • the position of the monoaxial source used to emit the magnetic field, or • the position of the monoaxial transducer used to measure the magnetic field, or • the frequency of the magnetic field, b) the construction of an estimation P i of the position of the object in the frame of reference on the basis of an observer O i involving only a subset M i of the N measurements, this observer O i being able to solve a system of equations in order to obtain the estimation P i using for this purpose only the subset M i of the N measurements, c) the estimation of the N measurements on the basis of the estimated position P i and of at least one direct model linking the position of the object to the set of N measurements, the direct model corresponding to a system of equations obtained by modelling the magnetic interactions between each of the monoaxial sources and each of the monoaxial transducers, and d) the determination whether or not this subset M i of measurements comprises a disturbed measurement by comparing the measurements estimated during step c) with the real measurements obtained during step a). <EOS>