TOF Distance Measurement with Saturation-Based Peak Detection
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Solution Overview
Problem
Current time-of-flight (TOF) techniques for measuring object distances using light detection and ranging (LIDAR) systems face challenges in accurately determining distances due to variations in electrical signal magnitudes, leading to errors in peak detection and measurement.
Innovation Solution
A distance-measuring device comprising an optical receiver, a saturation circuit that outputs signals equal to or greater than a reference value, and a peak detector using a Constant Fraction Discriminator (CFD) method to accurately measure object distances by converting light into electrical signals and detecting peaks, with a processor measuring the distance based on the peak detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical signals with varying magnitudes are directly used for peak detection, then the measurement process is simple, but detection accuracy deteriorates due to signal deviations
Solution Approach 1:
The patent introduces a saturation circuit as an intermediary component between the optical receiver and peak detector. This circuit clamps electrical signals exceeding a reference voltage level, converting variable-magnitude signals into standardized saturation signals. The saturation circuit acts as a mediator that eliminates signal magnitude variations before peak detection, thereby improving measurement accuracy without requiring complex signal processing algorithms
Solution Approach 2:
The patent changes the voltage parameter of electrical signals by introducing a reference voltage level. When electrical signals exceed this reference level, the saturation circuit clamps them to a constant saturation voltage. This parameter transformation converts variable-magnitude signals into uniform saturation signals, enabling consistent peak detection thresholds and improving distance measurement precision
2Measurement precision
If signal thresholding is applied to eliminate variations, then detection accuracy improves, but signal resolution may be lost
Solution Approach 1:
The saturation circuit performs preliminary signal conditioning before peak detection by clamping excessive voltage variations. This preliminary action removes harmful signal deviations that would otherwise cause peak detection errors, while the clamped saturation signals still preserve sufficient information for accurate peak timing determination in time-of-flight measurements
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 by stabilizing signal deviations and improving resolution, enabling more accurate distance measurements by outputting saturation signals of constant magnitude when electrical signals exceed a reference value, thereby enhancing the precision of distance measurement in TOF techniques.
Implementation Method 1
an optical receiver configured to detect light reflected by an object and convert the light into electrical signals
Data Source
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.