Method and system for diagnosing a cable by distributed reflectometry with self-selective average
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United States of America Patent
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Aug 16, 2016
Grant Date -
Mar 19, 2015
app pub date -
Mar 21, 2013
filing date -
Apr 3, 2012
priority date (Note) -
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Abstract
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.
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