Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Esteban Cabanillas

Antoine Dupret

Christophe Layer

Pierre Vincent

Hugues Duvillier

Mickael Cartron

A method for generating a reflectometry signal intended to be injected into a transmission line in order to identify the presence of at least one possible fault on the line, the method includes the steps of: generating a first multi-carrier digital signal on a first set of frequency carriers, generating a second corrective multi-carrier digital signal on a second set of frequency carriers separate from the first set, summing the first digital signal and the second corrective digital signal so as to generate a reflectometry signal, normalizing the frequency carriers of the reflectometry signal, the second corrective digital signal being determined so as to reduce the peak to average power ratio of the reflectometry signal with respect to the first digital signal.

Method for reducing the peak power of a multi-carrier reflectometry signal

A system for analyzing faults in a transmission line includes a test signal generator, a coupler for injecting the test signal into the transmission line and sampling the signal back-propagated in the transmission line, a control unit for generating a calibration signal equal to the opposite of the test signal and controlling its phase and its amplitude, at least one combiner for combining the calibration signal and the signal sampled by the coupler into a corrected signal, an amplifier for amplifying the corrected signal and a correlator for correlating the corrected signal and the test signal to produce a reflectogram, the control unit being further configured to make the amplitude and the phase of the calibration signal vary so as to eliminate, in the signal sampled by the coupler, at least one echo of the test signal on at least one point of impedance mismatch of the transmission line.

System for analysing faults by reflectometry of optimised dynamic range

A reflectometry system for the analysis of faults in a transmission line into which a complex signal, generated then modulated, has been injected, includes a means for measuring the modulated complex signal propagating in the transmission line, a demodulator of the measured signal designed to produce a demodulated complex signal, a complex correlator configured for correlating the demodulated complex signal with a copy of the generated complex signal, in order to produce a first time-domain reflectogram corresponding to the real part of the complex correlation and a second time-domain reflectogram corresponding to the imaginary part of the complex correlation, a module for joint analysis of the first time-domain reflectogram and of the second time-domain reflectogram for identifying the presence of faults in the transmission line.

System for detecting faults in a transmission line by using a complex signal

A method and device for detecting faults in a transmission line by reflectometry, include the following steps: injecting into the transmission line a reference signal at an emission frequency f; collecting a reflected signal at a point on the transmission line; sampling the reflected signal at a sampling frequency f, the sampling frequency fbeing different from the emission frequency f; storing each point of the sampled signal at a memory address corresponding to an index assigned to the point of the sampled signal and according to a precomputed memory-address increment &#x394;, the memory-address increment &#x394; depending on the emission frequency f, on the sampling frequency f, on an over-sampling factor &#x3a9; and on a preset acquisition time &#x3a3;; repeating the storing step during the acquisition time &#x3a3;; and generating, from the points stored during the acquisition time, a recomposed signal able to be used to detect faults.

Method and device for detecting faults in a transmission line

A reflectometry system includes at least one measurement means for measuring a reference signal retro-propagated in at least one transmission line, at least one analog-digital converter for converting at least one measured signal into a set of at least one first digital signal and one second digital signal, at least one complex correlator configured to correlate the real reference signal with a complex signal whose real part is formed by a first digital signal of the set and whose imaginary part is formed by a second digital signal of the set, so as to produce a first reflectogram corresponding to the real part of the complex signal and a second reflectogram corresponding to the imaginary part of the complex signal, an analysis module for analyzing at least the first reflectogram and the second reflectogram so as to identify the presence of defects in at least one transmission line.

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Orsay, France

Esteban Cabanillas