| 摘要 |
System for determining the activity of a mobile element (EM), includes at least one motion sensor (CM) having at least one measurement axis, which is provided with a fattener (MF) for securely connecting said motion sensor (CM) to the mobile element (EM). The system further includes a filter (FILT) for selecting, for each measurement axis of the motion sensor, high frequencies above a first threshold (S1); processing equipment (DET) for determining a unidimensional high-frequency component (y(n)) equal to the square of the Euclidean norm of said high frequencies along the measurement axes of the motion sensor (CM) that are taken into account; a calculator (CALC) for calculating, for each state, probability density functions (Py,i) of said high-frequency component (HF), said probability density function corresponding to each state according to a Chi-square law with a degree of freedom equal to the number of measurement axes of the motion sensor (CM) that are taken into account; and an analyzer for defining states of the mobile element, which utilizes the probability density function of the high-frequency component for each state, together with the probabilities of transitions between two successive states. |
