Method for characterising a soft fault in a cable

A computer program comprising instructions stored on a tangible non-transitory storage medium for executing on a processor a method for characterizing a fault affecting a cable in which a reference signal s of limited time support is injected and a measurement r of the reflection of said reference signal s in the cable is performed, wherein said method comprises the steps of:

• identifying a section of the measurement r corresponding to a fault, this measurement section being called the signature of the fault;
• generating a modified reference signal s′, of parameterizable amplitude, equal to the sum of said reference signal s and of said reference signal s inverted and delayed by a parameterizable delay;
• determining conjointly the values of the parameterizable delay and of the parameterizable amplitude that minimize the error between the modified reference signal s′ and the signature of the fault;
• and
• deducing therefrom an estimation of the length of the fault from the determined value of said delay.

A tangible non-transitory processor-readable recording medium on which is recorded a program comprising instructions for executing a method for characterizing a fault affecting a cable in which a reference signal s of limited time support is injected and a measurement r of the reflection of said reference signal s in the cable is performed, wherein said method comprises the steps of:

• identifying a section of the measurement r corresponding to a fault, this measurement section being called the signature of the fault;
• generating a modified reference signal s′, of parameterizable amplitude, equal to the sum of said reference signal s and of said reference signal s inverted and delayed by a parameterizable delay;
• determining conjointly the values of the parameterizable delay and of the parameterizable amplitude that minimize the error between the modified reference signal s′ and the signature of the fault;
• and
• deducing therefrom an estimation of the length of the fault from the determined value of said delay.

A device for characterizing a fault affecting a cable comprising an injecting device for injecting a reference signal s at a point of the cable, a measurement device for measuring a reflection r of said signal in the cable and a calculator configured for implementing a method for characterizing a fault affecting a cable in which a reference signal s of limited time support is injected and a measurement r of the reflection of said reference signal s in the cable is performed, wherein said method comprises the steps of:

• identifying a section of the measurement r corresponding to a fault, this measurement section being called the signature of the fault;
• generating a modified reference signal s′, of parameterizable amplitude, equal to the sum of said reference signal s and of said reference signal s inverted and delayed by a parameterizable delay;
• determining conjointly the values of the parameterizable delay and of the parameterizable amplitude that minimize the error between the modified reference signal s′ and the signature of the fault;
• and
• deducing therefrom an estimation of the length of the fault from the determined value of said delay.