A method for detecting an atypical behavior of telemetry parameters, each parameter being measured during a learning time interval and a detection time interval subsequent to the learning time interval, the method including for each parameter a learning phase and a detection phase; the learning phase including the determination of a nominal behavior boundary ( f) of the corresponding parameter from the measurements of this parameter acquired during the learning interval; the detection phase including the following steps of: - dividing the detection time interval into a plurality of time frames ( F i); - for each obtained time frame ( F i), calculating a set of descriptors ( D j) representative of the behavior of the corresponding parameter, the descriptors ( D j) being calculated according to the measurements of this parameter in this time frame ( F i), and forming an initial vector ( V i) of descriptors ( D j) from the calculated descriptors ( D j); - normalizing the initial vectors ( V i) of descriptors ( D j); - for each initial vector ( V i) of descriptors ( D j), reducing the dimension of this initial vector ( V i) of descriptors ( D j) to form a reduced vector ( v i) of descriptors ( D j), each component of the reduced vector ( v i) of descriptors ( D j) corresponding to a linear combination of the components of the initial vector ( V i) of descriptors ( D j) from which this reduced vector ( v i) of descriptors ( D j) has been formed; - determining the belonging of each reduced vector ( v i) of descriptors ( D j) to a domain delimited by the nominal behavior boundary ( f) of the corresponding parameter; - when a reduced vector ( v i) of descriptors ( D j) is outside the field, generating a warning corresponding to an atypical behavior of the corresponding parameter in the time frame ( F i) corresponding to this reduced vector ( v i) of descriptors ( D j). - dividing the detection time interval into a plurality of time frames ( F i); - for each obtained time frame ( F i), calculating a set of descriptors ( D j) representative of the behavior of the corresponding parameter, the descriptors ( D j) being calculated according to the measurements of this parameter in this time frame ( F i), and forming an initial vector ( V i) of descriptors ( D j) from the calculated descriptors ( D j); - normalizing the initial vectors ( V i) of descriptors ( D j); - for each initial vector ( V i) of descriptors ( D j), reducing the dimension of this initial vector ( V i) of descriptors ( D j) to form a reduced vector ( v i) of descriptors ( D j), each component of the reduced vector ( v i) of descriptors ( D j) corresponding to a linear combination of the components of the initial vector ( V i) of descriptors ( D j) from which this reduced vector ( v i) of descriptors ( D j) has been formed; - determining the belonging of each reduced vector ( v i) of descriptors ( D j) to a domain delimited by the nominal behavior boundary ( f) of the corresponding parameter; - when a reduced vector ( v i) of descriptors ( D j) is outside the field, generating a warning corresponding to an atypical behavior of the corresponding parameter in the time frame ( F i) corresponding to this reduced vector ( v i) of descriptors ( D j).