Transmission Line Parameter Determination via Propagation Factor Filtering
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Solution Overview
Problem
Existing methods for determining the linear parameters of transmission lines, such as resistance, inductance, capacitance, and conductance, are inaccurate and require multiple measurement points, making them sensitive to electrical faults and restrictive in application, especially in cable diagnosis where precise characterization is needed.
Innovation Solution
A method that determines the complex propagation factor and filters measurements using polynomial regression models to estimate linear parameters like resistance, inductance, capacitance, and conductance, allowing for precise characterization of cables through reflectometry methods, even in the absence of multiple measurement points and reducing sensitivity to faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods are used to determine linear parameters, then measurement can be performed, but measurement precision deteriorates due to sensitivity to electrical faults and inaccurate results
Solution Approach 1:
The patent transforms the measurement approach by changing from direct linear parameter measurement to measuring the complex propagation factor γ (which has both real part α for attenuation and imaginary part β for phase). This parameter transformation allows deriving RLCG parameters from γ through filtering and processing, making the measurement less sensitive to electrical faults and improving both precision and reliability.
Solution Approach 2:
The patent replaces traditional direct measurement methods with a signal processing-based approach using frequency polynomial regression models. Instead of directly measuring RLCG parameters which are sensitive to faults, the method measures the complex propagation factor and uses mathematical filtering (low-pass, band-pass, or band-stop filters) to extract accurate RLCG values, substituting physical measurement with computational analysis.
2Measurement precision
If existing methods are used to determine linear parameters, then measurement can be performed, but device complexity increases due to requirement of multiple measurement points
Solution Approach 1:
The patent extracts the essential measurement requirement to a single measurement point by measuring the complex propagation factor γ at one location on the transmission line. The method then derives all linear parameters (R, L, C, G) from this single measurement through mathematical processing, eliminating the need for multiple measurement points while maintaining measurement precision.
Solution Approach 2:
The complex propagation factor γ serves multiple functions simultaneously: its real part provides attenuation information for deriving resistance and conductance, while its imaginary part provides phase information for deriving inductance and capacitance. This single measurement thus provides all necessary information for complete RLCG parameter determination, reducing measurement complexity.
3Ease of manufacture
If manufacturer data is used for linear parameters, then characterization can be obtained, but manufacturing precision deteriorates due to insufficient accuracy
Solution Approach 1:
The patent enables the transmission line itself to provide its accurate RLCG parameters through the measurement method. Instead of relying on manufacturer-provided data which may be inaccurate or generic, the method allows the actual cable to reveal its true characteristics through measuring the complex propagation factor and applying the filtering process, achieving both ease of measurement and high accuracy.
Data Source
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AI summary
Method of determining at least one lineal parameter of a transmission line, said method comprising the following steps: • determining (103) at least one measurement of the complex propagation factor γ as a function of frequency on the basis of at least one measurement carried out on the transmission line; • determining (104) at least one measurement of the lineal attenuation α of the transmission line equal to the real part of the measurement of the complex propagation factor γ and/or of at least one measurement of the phase factor β of the transmission line equal to the imaginary part of the measurement of the complex propagation factor γ; and filtering (105) the measurement of the lineal attenuation α and/or the measurement of the phase factor β on the basis of a polynomial frequency regression model depending on the physical characteristics of the transmission line.