US 2018/0149693 A1Published application

Reflectometry method and device for diagnosing cables in use

AssigneeWin Ms

InventorLaurent SOMMERVOGEL

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Abstract

A complete injection signal is provided having a digital spectrum formed from components weighted by a set of coefficients, in a preliminary step, the coefficients of the components included within a frequency band are attenuated resulting in an incomplete digital spectrum being obtained; in a next step, the analog signal composed from the incomplete digital spectrum is injected into the electrical line; in a next step, the echo corresponding to the injected signal is measured; in a next step, the digital spectrum of the echo is calculated; in a next step, the digital spectrum of the echo of the complete analog signal if the latter had been injected is estimated, the kth component of the estimated complete digital spectrum being equal to the kth component of the digital spectrum of the echo received multiplied by the ratio between the kth component of the digital spectrum of the complete injection signal over the kth component of the incomplete digital spectrum; in a next step, the measurement of the reflectogram of the line is obtained based on the estimated complete digital spectrum.

Claims12

Dependent claims

A method for diagnosing at least one electrical line by reflectometry measurements, said electrical line being in use within a given frequency band, the diagnosis being carried out by analysis of the reflectogram of said line, wherein:

a complete injection signal having a digital spectrum formed from components weighted by a set of coefficients, in a preliminary step, the coefficients of the components included within said frequency band are attenuated resulting in an incomplete digital spectrum being obtained;
in a next step, the analog signal composed from said incomplete digital spectrum is injected into the electrical line;
in a next step, the echo corresponding to said injected signal is recovered by sampling measurements of said echo;
in a next step, the digital spectrum (Ycancel) of said echo is calculated;
in a next step, the digital spectrum (Ŷfull) of the echo of the complete analog signal if the latter had been injected is estimated, the kth component (Ŷfullk) of the estimated complete digital spectrum being equal to the kth component (Ycancelk) of the digital spectrum of the echo received multiplied by the ratio (ξk) between the kth component (Xfullk) of the digital spectrum of the complete injection signal over the kth component (Xcancelk) of the incomplete digital spectrum;
in a next step, the measurement of the reflectogram of said line is obtained based on the estimated complete digital spectrum (Ŷfull).

3 more elements

A reflectometer device, designed to be used for diagnosing a line in use within a given frequency band, comprising at least:

a parameterization block for configuring the parameters of the signal to be injected into said line, a complete injection signal having a digital spectrum formed from components weighted by a set of coefficients, the coefficients of the components included within said frequency band being attenuated so as to obtain an incomplete digital spectrum;
a block synthesizing the signal to be injected, in the digital domain, starting from said incomplete digital spectrum;
a digital-analog converter converting the synthesized digital signal into an analog signal;
means for coupling to said line allowing said analog signal to be injected into said line;
an analog-digital converter converting the echo corresponding to the injected signal;
processing means:
carrying out sampled measurements of said echo and storing the samples;
calculating the digital spectrum (Ycancel) of said echo;
estimating the digital spectrum (Ŷfull) of the echo of the complete analog signal if the latter had been injected, the kth component (Ŷfullk) of the estimated complete digital spectrum being equal to the kth component (Ycancelk) of the digital spectrum of the echo received multiplied by the ratio (ξk) between the kth component (Xfullk) of the digital spectrum of the complete injection signal over the kth component (Xcancelk) of the incomplete digital spectrum;
obtaining the reflectogram of said line based on the estimated complete digital spectrum (Ŷfull).

7 more elements

Dependencies are inferred from the claim text.