Signal Time Correction for Time Walk and Interference
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Solution Overview
Problem
Existing signal processing technologies face challenges in accurately determining the receiving time of signals due to factors like amplitude fluctuations and interference signals, leading to reduced measurement accuracy.
Innovation Solution
A time correction device comprising a first time measurement component, a correction component, and a processing device that measures the receiving time of a valid signal, collects correction information, and determines a corrected receiving time by correcting the original time based on the collected information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If amplitude-based time measurement is used, then time measurement can be performed, but time walk effect occurs reducing measurement accuracy
Solution Approach 1:
The patent transforms the time measurement from amplitude-based to duration-based. By measuring the duration of the signal above a threshold level rather than the time to reach a fixed amplitude, the system eliminates the time walk effect caused by amplitude variations. This parameter change fundamentally resolves the contradiction between achieving time measurement and maintaining measurement consistency.
2Measurement precision
If signal filtering is applied to remove interference, then measurement accuracy improves, but signal processing complexity increases
Solution Approach 1:
The patent applies preliminary filtering actions to the signal before time measurement. By pre-processing the signal to remove interference components and establish a clean baseline, the system simplifies subsequent measurement operations. The filtering is performed once beforehand, avoiding the need for complex real-time processing during measurement.
Solution Approach 2:
The patent extracts and removes interference signals from the original signal before performing time measurement. By separating the valid signal components from interference components through filtering and thresholding operations, the system achieves accurate measurement without requiring complex interference rejection during the measurement process itself.
3Speed
If leading edge discrimination is used for time measurement, then fast response is achieved, but time walk effect occurs due to amplitude variations
Solution Approach 1:
The patent changes the measurement parameter from amplitude-based leading edge detection to duration-based measurement. Instead of measuring when the signal reaches a fixed amplitude threshold, the system measures how long the signal remains above a threshold level. This parameter change maintains fast response while eliminating the time walk effect, as duration measurement is independent of signal amplitude.
Data Source
AI summary
The present disclosure provides devices, systems, and methods for time correction. The device may include a first time measurement component configured to measure a receiving time of a valid signal; a correction component configured to collect correction information for correcting the receiving time of the valid signal; and a processing device configured to determine a corrected receiving time of the valid signal by correcting the receiving time of the valid signal based on the correction information.