| 摘要 |
<p>The invention relates to a reflectometry method for detecting faults (105) in a cable (104), including a step of acquiring a signal S(t) fed into said cable (104) and reflected on at least one singularity of said cable (104), said method further including the following steps: decomposing said reflected signal S(t) into a plurality of time components Si(t); constructing, from said time components, a plurality of intermediate signals (Xiq(t),Xi(t)), using the following relation (A), for i varying from 1 to the number n of samples of the signal S(t), where alpha is a weighting coefficient equal to the complex number j, the square of which is equal to -1 or equal to the nth root of the unit (B), where q varies from 1 to the integer part of n/2; calculating the Wigner-Ville transform, WXi, Ws, of each of said intermediate signals and of said reflected signal; calculating, from a linear combination of said Wigner-Ville transforms of each of said intermediate signals WXi and of said reflected signal Ws, a time-frequency transform Taus(t,omega) equal to the sum of the Wigner-Ville transforms of said time components Si(t); detecting and locating the maxima of said time-frequency transforms Taus (t,omega), and deriving the existence and the location of the sought faults (105) therefrom.</p> |
