Method and system for diagnosing a cable by distributed reflectometry with self-selective average

摘要

A method of testing a cable by distributed reflectometry, comprises: injecting into the cable a first periodic signal and a second periodic signal having the same number N of periods and the same number M of samples per period as the first signal; acquiring a measurement of the reflection, from impedance discontinuities of the cable, of each of said first and second signals; taking the average of said measurements of the reflection of at least one of said first or second signals over all of its periods to produce at least one reflectogram; determining the positions of faults in the cable on the basis of at least the reflectogram; the method being wherein each period of the second signal is injected into the cable with a delay or an advance which has an increasing predetermined absolute value for each successively injected period.

主权项

1. A method for testing a cable by distributed reflectometry, comprising:
producing a first periodic signal and a second periodic signal having the same number N of periods and the same number M of samples per period, injecting into the cable, at a first injection point, the first periodic signal, and, at a second injection point, the second periodic signal, acquiring, at one or more cable observation points, a measurement of the reflection, from impedance discontinuities of the cable, of each of said first and second signals, said acquisition being synchronized with the injection of a signal from among said first and second signals, taking the average of said measurements of the reflection of at least one of said first or second signals over all of its periods to produce at least one reflectogram, and determining the positions of faults in the cable on the basis of at least said reflectogram, and wherein each period of said second signal is injected into the cable with a delay or an advance having a constant predetermined absolute value.