Passive Resonator Reflections for Transmission Line Delay Measurement
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Solution Overview
Problem
Accurately estimating propagation delay in transmission lines is challenging due to unknown exact distances, intervening components, and cable degradation, which affects the accuracy of common time signals used in electrical power generation and delivery systems.
Innovation Solution
The use of passive resonant reflections, where a first passive resonator reflects a signal back to a second resonator on the transmission line, allowing for the calculation of propagation delay without active signal generators or receivers, using impedance mismatch and tuned LC or LRC circuits to generate and detect high-frequency reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If passive resonant reflections are used to measure propagation delay, then measurement precision is improved, but device complexity increases due to requiring resonators and impedance mismatch components
Solution Approach 1:
The system uses the existing transmission line infrastructure and common time signals to perform self-diagnosis of propagation delay. The resonators are passively excited by the existing signal traffic, and the reflection measurements are taken using the same communication channels, eliminating the need for separate active measurement equipment.
Solution Approach 2:
Resonators are introduced as intermediary components that convert the propagation delay measurement problem into a frequency-domain reflection measurement problem. The resonators are tuned to specific frequencies where impedance mismatch creates detectable reflections, allowing indirect measurement of propagation delay through frequency response analysis.
2Reliability
If continuous monitoring of propagation delay is implemented, then reliability is improved, but use of energy increases due to continuous measurement operations
Solution Approach 1:
Instead of continuous monitoring, the system performs propagation delay measurements periodically by analyzing reflections at specific frequency points. The resonators are excited at discrete frequency intervals, and measurements are taken only when needed for calibration or anomaly detection, rather than continuously.
Solution Approach 2:
The system leverages existing signal traffic and power infrastructure to perform measurements without requiring dedicated measurement power sources. The resonators are passively excited by the existing signal environment, and the measurement process utilizes the operational signals already present in the system.
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 method provides accurate and non-invasive measurement of propagation delay, enabling correction of time signals and continuous monitoring without disrupting the electrical system, and can detect changes in propagation delay over time to prevent errors or activate protection mechanisms.
Implementation Method 1
A resonator at the receiver creates an impedance mismatch at high frequencies and causes reflections back to the transmitter
Implementation Method 2
The resonator is tuned to a frequency outside the bandwidth typically used by the transmitter or receiver
Data Source
AI summary
Systems and methods are described for calculating a propagation delay of a transmission line. A transmitter may transmit a signal from a first end of a transmission line to a second end of the transmission line at a first time, t1. A signal reflection device (e.g., a passive resonator) connected to the second end of the transmission line may generate a reflection at a second time, t2. A reflection detector (e.g., a matched, passive resonator) at the first end of the transmission line may receive the reflection from the signal reflection device, at a third time, t3. A propagation delay calculator may calculate the propagation delay of the transmission line as corresponding to one-half of a difference between the first time, t1, and the third time, t3.