TOF Distance Measurement Peak Detection Using Saturation and CFD
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Solution Overview
Problem
Existing time-of-flight (TOF) techniques for distance measurement face challenges in accurately detecting peaks from electrical signals with varying magnitudes, leading to errors in distance measurement due to signal deviations.
Innovation Solution
A distance-measuring device incorporating a saturation circuit that outputs a constant magnitude signal when the input electrical signal exceeds a reference value, reducing signal deviation and improving peak detection accuracy, combined with a Constant Fraction Discriminator (CFD) circuit for precise peak detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional TOF techniques are used to measure distance, then the measurement process can be performed, but detection errors increase and measurement precision deteriorates due to signal deviations when electrical signals have varying magnitudes
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the reference level of the decision circuit based on the magnitude of the received electrical signal. When the signal magnitude varies, the reference level is automatically adjusted to maintain optimal peak detection accuracy, thereby resolving the contradiction between measurement precision and reliability
Solution Approach 2:
The patent implements feedback by using the detected peak position to adjust subsequent reference levels and detection parameters. The system continuously monitors signal characteristics and adjusts the decision circuit's reference level accordingly, creating a closed-loop system that maintains high detection accuracy despite varying signal magnitudes
2Adaptability or versatility
If signal magnitude varies in TOF measurement, then the measurement can accommodate different distances, but peak detection accuracy deteriorates due to signal deviations
Solution Approach 1:
The patent applies dynamics by making the reference level of the decision circuit dynamically adjustable rather than fixed. The reference level changes adaptively based on the incoming signal magnitude, allowing the system to maintain high peak detection accuracy across a wide range of distances and signal conditions
Solution Approach 2:
The system changes the reference level parameter in response to varying signal magnitudes. This parameter adjustment allows the decision circuit to maintain optimal operating conditions regardless of whether the received signal is strong or weak, thereby preserving measurement precision across different adaptability conditions
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
The solution reduces detection errors and enhances the resolution of distance measurement by stabilizing signal deviations and improving peak detection speed, thereby providing more accurate distance measurements.
Implementation Method 1
an optical receiver configured to detect light reflected by an object and convert the light into electrical signals
Data Source
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AI summary
Provided are a distance-measuring device and a method thereof. The distance-measuring device detects light reflected by an object and converts the light into electrical signals, outputs a saturation signal equal to or greater than a reference value from among the electrical signals, detects a peak using the saturation signal, and measures a distance to the object using the peak.