Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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 fDAC; collecting a reflected signal at a point on the transmission line; sampling the reflected signal at a sampling frequency fADC, the sampling frequency fADC being different from the emission frequency fDAC; 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 ?, the memory-address increment ? depending on the emission frequency fDAC, on the sampling frequency fADC, on an over-sampling factor ? and on a preset acquisition time ?; repeating the storing step during the acquisition time ?; and generating, from the points stored during the acquisition time, a recomposed signal able to be used to detect faults.

Abstract: A reflectometry system includes an amplifier of the signal to be injected into the cable to be analyzed and that incorporates a mechanism for correcting for the non-linear effect of the amplifier without significantly increasing the bulk of the system by limiting the number of additional components to be incorporated with respect to a system without correction of the non-linear effect.

Abstract: A method for characterizing a fault in a network of at least one transmission line, the method includes the steps of: injecting a first reference signal into the network, acquiring a first measurement of the first reference signal after its propagation in the network, temporally reversing the measurement to generate a second reference signal, injecting the second reference signal into the network, acquiring a second measurement of the second reference signal after its propagation in the network, calculating the intercorrelation between the second measurement and the second reference signal.

Abstract: 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.

Abstract: 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 fDAC; collecting a reflected signal at a point on the transmission line; sampling the reflected signal at a sampling frequency fADC, the sampling frequency fADC being different from the emission frequency fDAC; 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 ?, the memory-address increment ? depending on the emission frequency fDAC, on the sampling frequency fADC, on an over-sampling factor ? and on a preset acquisition time ?; repeating the storing step during the acquisition time ?; and generating, from the points stored during the acquisition time, a recomposed signal able to be used to detect faults.

Abstract: 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.

Abstract: A method for detecting an intermittent fault in a transmission line, includes the following steps: acquiring, at a point of the line, using a measurement device, a temporal measurement of a reference signal previously injected into the line using an injection device, reflected off a singularity of the line and propagated back to the point, filtering the temporal measurement of the signal using at least one filter that is predetermined depending on the spectral signature of a given type of fault, calculating the intercorrelation between at least one filtered signal and the reference signal so as to produce at least one time reflectogram, analyzing the at least one time reflectogram so as to characterize the possible presence of at least one intermittent fault on the transmission line.

Abstract: 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.

Abstract: A method for detecting a fault in a transmission line, includes the following steps: acquiring, at a point of the line, using a measurement device, a temporal measurement of a reference signal previously injected into the line using an injection device, reflected off a singularity of the line and propagated back to the point, converting the temporal measurement of the signal into the frequency domain, measuring the phase of at least one frequency component of the signal, subtracting a reference phase from each measured phase in order to obtain a corrected phase, determining the distance ld between the point of the line and the singularity from at least one corrected phase.