Cable Fault Diagnosis via Reconstructed Reflection Signals
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Solution Overview
Problem
Existing cable fault detection methods, such as TDR, face challenges in accurately identifying fault types and locations due to complex loading conditions and interference from imperfections and pulse echoes, especially in shared transmission media like 10BASE-TIS networks, leading to ambiguous and unreliable results.
Innovation Solution
A system that includes a terminal to observe signals on a cable and processing circuitry to reconstruct reflection signals and determine fault presence and type by correlating the reconstructed signals with the transmit signal, using energy detection and receive signals to generate correlation values and identify fault locations through varying delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TDR method is used for cable fault detection, then fault detection capability is provided, but measurement precision deteriorates due to complex loading conditions and interference from imperfections and pulse echoes
Solution Approach 1:
The patent extracts only the useful reflected signal components corresponding to actual faults while eliminating interference from cable imperfections and pulse echoes. This is achieved by analyzing the correlation between transmitted and received signals to identify genuine fault reflections, thereby improving measurement precision while maintaining fault detection capability.
Solution Approach 2:
The patent introduces signal correlation analysis as an intermediary processing step between traditional TDR and fault identification. By computing correlation values between transmitted and received signals, the system acts as a mediator to distinguish true fault reflections from noise and interference, resolving the precision-reliability contradiction.
2Ease of operation
If traditional reflection analysis is used, then fault detection is simplified, but reliability worsens due to ambiguous results from noise and interference
Solution Approach 1:
The patent implements feedback through correlation analysis where the received signal is compared with the transmitted signal to verify fault reflections. This feedback mechanism provides confidence validation for detected faults, ensuring that only reliable fault identifications are reported, thereby maintaining simplicity while improving reliability.
3Measurement precision
If correlation analysis with multiple delayed signals is performed, then measurement precision improves for fault location, but device complexity increases
Solution Approach 1:
The patent employs periodic correlation analysis by systematically varying the delay parameter across multiple measurements. This periodic approach allows precise fault location determination through delay-dependent correlation peaks while using efficient algorithms to manage processing complexity, achieving high precision without excessive device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate and efficient detection of open-circuit and short-circuit faults in cables by reducing noise interference and ambiguity, providing reliable fault identification and location determination.
Implementation Method 1
determine whether a fault is present in the cable at least partially responsive to a correlation between the reconstructed reflection signal and the transmit signal
Implementation Method 2
observe, responsive to provision of a transmit signal to a cable, a signal on the cable
Data Source
AI summary
Cable fault detection using reconstructed reflection signals and related systems, methods, and devices are disclosed. An apparatus includes a terminal to provision and observe a signal on the cable and a processing circuitry. The processing circuitry may reconstruct a reflection signal at least partially responsive to the observed signal, generate correlation values between the reconstructed reflection signal and multiple signals representing the transmit signal as variably delayed; and determine whether a fault is present in the cable at least partially responsive to the correlation values.