Abstract: A reflectometry system for analyzing faults in a transmission line, a reference signal being generated, in an initial step, and injected in the transmission line, the system includes a device (CPL) for acquiring the analog signal back-propagated in the transmission line, an equalization circuit (EGA) configured for equalizing the amplitudes obtained on the reflectogram for the peaks of the injected signal after its point of injection into the transmission line and of the signal reflected on the end of the transmission line, a binarization device (B) for converting the back-propagated analog signal into a signal digitized over two quantization levels, a correlator (COR) configured for correlating the digitized signal with the reference signal in order to produce a time-domain reflectogram, a module for analyzing the time-domain reflectogram in order to identify the presence of faults in the transmission line.

Abstract: A reflectometry system for analyzing faults in a transmission line, a reference signal being generated, in an initial step, and injected in the transmission line, the system includes a device (CPL) for acquiring the analog signal back-propagated in the transmission line, an equalization circuit (EGA) configured for equalizing the amplitudes obtained on the reflectogram for the peaks of the injected signal after its point of injection into the transmission line and of the signal reflected on the end of the transmission line, a binarization device (B) for converting the back-propagated analog signal into a signal digitized over two quantization levels, a correlator (COR) configured for correlating the digitized signal with the reference signal in order to produce a time-domain reflectogram, a module for analyzing the time-domain reflectogram in order to identify the presence of faults in the transmission line.

Abstract: A method for calculating a reflectogram associated with a transmission line into which a reference signal is injected beforehand, the method includes the following iteratively executed steps: acquiring, at a current time i+dK, a measurement of dK samples of the signal after propagation thereof in the transmission line, determining a reflectogram Ri+dK at the current time i+dK, from a previous reflectogram Ri, calculated at a previous time i, by performing the following operations for each value of the reflectogram: subtracting, from the previous reflectogram Ri, at least one product of correlation between a number dK of samples of the signal that are measured at the previous time i and a number dK of corresponding samples of the reference signal that are injected into the transmission line at an injection time i??dK.

Abstract: A method for generating a reflectometry signal for the diagnosis of defects impacting a transmission line or a network of transmission lines, the method executed by a diagnosis device belonging to a distributed system comprising a plurality of diagnosis devices connected to the line or network of lines, the method comprises the following steps: Generating an electrical signal comprising a plurality of frequency carriers regularly dispersed within a frequency band subdivided into sub-carriers so that each device of the distributed system uses different sub-carriers from the other devices of the system; injecting the electrical signal into the line or network of lines.

Abstract: A method for compensating for the propagation inhomogeneities in a time-domain reflectogram measured for a given cable comprises the following steps, executed in an iterative manner: injecting a test signal into the cable, measuring the reflection of the test signal to form a time-domain reflectogram, identifying at least a time portion of the time-domain reflectogram comprising at least one amplitude peak corresponding to a propagation inhomogeneity, subtracting the identified time portion of the reflectogram, divided by the signal reflection coefficient at the injection point, from the test signal, and replacing the test signal with the result of the subtraction.

Abstract: A method may include injecting at an instant a reference signal at an injection point of the assembly, the reference signal having been obtained beforehand by injecting an initial signal at the injection point at an instant, by a measurement of the reflected signal resulting from this injection, and by the time reversal of the measured signal. The method may also include measuring a reflected signal resulting from the propagation of the signal in the assembly of at least one cable. The method may further include determining the aging of the assembly of at least one cable between the instant and the instant, the aging being deduced from the measurement of the reflected signal.

Abstract: A method for generating a reflectometry signal for the diagnosis of defects impacting a transmission line or a network of transmission lines, the method executed by a diagnosis device belonging to a distributed system comprising a plurality of diagnosis devices connected to the line or network of lines, the method comprises the following steps: Generating an electrical signal comprising a plurality of frequency carriers regularly dispersed within a frequency band subdivided into sub-carriers so that each device of the distributed system uses different sub-carriers from the other devices of the system; injecting the electrical signal into the line or network of lines.

Abstract: A method for compensating for the propagation inhomogeneities in a time-domain reflectogram measured for a given cable comprises the following steps, executed in an iterative manner: injecting a test signal into the cable, measuring the reflection of the test signal to form a time-domain reflectogram, identifying at least a time portion of the time-domain reflectogram comprising at least one amplitude peak corresponding to a propagation inhomogeneity, subtracting the identified time portion of the reflectogram, divided by the signal reflection coefficient at the injection point, from the test signal, and replacing the test signal with the result of the subtraction.

Abstract: An overlayer intended to cover an object in order to detect a defect on a surface of the object, comprises an assembly made up of a plurality of current-conducting wire elements of different mechanical resistances and a means for insulating the conducting wire elements, each conducting wire element being arranged such as to at least partially cover a surface of the object when the overlayer covers the object, each conducting wire element being arranged to allow the connection thereof to a test device for detecting a defect affecting the conducting element.

Abstract: A method for analyzing a cable, into which a first reference signal g is injected, calculates the dynamic correlation between a measurement f of the reflection, from at least one discontinuity in the cable, of the injected signal g and a second reference signal gp equal to the first reference signal g weighted by a frequency-dependent function modeling the propagation of a wave along the cable.

Abstract: A method comprises: injecting at an instant a reference signal at an injection point of said assembly, the reference signal having been obtained beforehand by injecting an initial signal at the injection point at an instant, by a measurement of the reflected signal resulting from this injection, and by the time reversal of the measured signal; measuring a reflected signal resulting from the propagation of the signal in the assembly of at least one cable; and determining the aging of the assembly of at least one cable between the instant and the instant, the aging being deduced from the measurement of the reflected signal.

Abstract: A method for detecting and determining a position of faults using reflectometry in a wired electrical network including: injecting a test signal e(t) into a cable in the electrical network, a timing of successive injections being controlled by a synchronization module that generates an emission clock signal and a reception clock signal; retrieving a reflected signal on the cable; sampling the reflected signal at a frequency Fe=1/Te, where Te is a sampling period; counting a number of samples obtained for the reflected signal and comparing the number of samples obtained with a number n predefined as a function of a length of the cable or the electrical network to be diagnosed, where n is an integer; repeating the injecting, the sampling, and the counting steps N times, shifting the emission clock signal by a duration ?; reconstituting the reflected signal from n*N samples obtained; and analyzing the reconstituted reflected signal to detect a fault.

Abstract: This invention relates to a method for detecting and determining the position of faults using reflectometry in a wired electrical network comprising the following steps: inject a test signal into a cable in said network, retrieve a reflected signal on said cable, sample said reflected signal at a frequency Fe=1/Te, repeat the previous steps N times, where N is an integer number, for each injected test signal, retrieve n samples from the corresponding reflected signal, where n is an integer number, analyse M=n*N retrieved samples to detect and locate a fault in the wired electrical network. The method is characterised in that the retrieved samples are compared with an adaptive threshold defined for each diagnostic as a function of the test signal injected in the tested cable.

Abstract: The invention relates to a method and a device for analyzing electric cable networks in order to detect and locate defects in the cables comprising at least one branch connection from which N secondary sections extend. The method involves injecting into the network, at a plurality of injection points E, pseudo-random sequences of digital signals PNi(t) that are de-correlated from each other, and collecting, at one or more observation points Sj, composite time signals Rj(t) generated by the circulation of the output sequences and the reflections thereof in the impedance discontinuities of the network. The correlation between the composite signals and the time-offset pseudo-random sequences is then computed, and the positions of correlation peaks are sought to deduce therefrom the positions of defects in the network by taking into account the signal propagation speed in the network.