LiDAR Ranging Adjustment Method Mitigating Ambient Light Saturation
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Solution Overview
Problem
Conventional LiDAR devices experience decreased ranging accuracy due to saturation from intense ambient light, which affects the detection of echo signals and distance information.
Innovation Solution
A ranging adjustment method for LiDAR devices that involves obtaining histogram data of ambient light, adjusting the detection efficiency of the receiving module based on this data, and dynamically adjusting emission power and laser beam emissions to improve signal detection and reduce ambient light impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the laser beam receiving module operates in intense ambient light environment, then the detection range is extended, but the ranging accuracy decreases due to photoelectric detection saturation
Solution Approach 1:
The patent applies preliminary action by obtaining histogram data of ambient light before performing echo signal detection. The system pre-characterizes the ambient light distribution through multiple measurements and histogram construction, then uses this pre-acquired information to guide subsequent detection parameter settings, thereby preventing saturation before it occurs.
Solution Approach 2:
The patent changes detection parameters based on ambient light conditions. Specifically, it adjusts detection thresholds and integration parameters according to the histogram characteristics of ambient light, transforming the fixed parameter operation into a dynamic parameter adjustment strategy that adapts to varying light conditions and maintains detection accuracy.
2Reliability
If the photoelectric detection avalanche diode operates with high sensitivity to detect weak echo signals, then the detection capability is improved, but the device becomes prone to saturation from ambient light
Solution Approach 1:
The patent extracts the ambient light component from the total received signal by separately measuring and characterizing it through histogram analysis. By isolating and understanding the ambient light distribution, the system can subtract or compensate for its effect, thereby removing the harmful saturation influence while preserving the weak echo signal detection capability.
Solution Approach 2:
The patent implements feedback by continuously monitoring the received signal distribution through histogram analysis and using this information to adjust detection parameters. The system feeds back the ambient light characteristics to modify subsequent detection settings, creating a closed-loop control that prevents saturation while maintaining high sensitivity.
3Measurement precision
If multiple pulse signals are superimposed to form histogram data for accurate ambient light characterization, then the measurement precision is improved, but the time consumption increases
Solution Approach 1:
The patent applies partial action by performing a limited number of pulse signal superimpositions to create the histogram. Rather than indefinitely increasing the number of measurements, it selects an optimal number of pulses that provides sufficient statistical accuracy for ambient light characterization without excessive time consumption, balancing precision and efficiency.
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 method enhances ranging accuracy by dynamically adjusting detection efficiency and emission parameters, effectively mitigating the impact of ambient light on LiDAR performance.
Implementation Method 1
a laser beam receiving module and a corresponding signal processing circuit respectively connected to the laser beam emission assembly and the laser beam receiving assembly, wherein the laser beam receiving assembly is configured to convert the echo signal into a current signal
Data Source
AI summary
The present disclosure provides a LiDAR device and a ranging adjustment method of the same. The ranging adjustment method includes: turning off a laser beam emission module and turning on a laser beam receiving module, to obtain histogram data of ambient light; adjusting detection efficiency of the laser beam receiving module based on the histogram data of the ambient light; turning on the laser beam emission module and the laser beam receiving module, to obtain histogram data of a current optical signal; and comparing the histogram data of the current optical signal with the histogram data of the ambient light, and determining histogram data of an echo signal and distance information of a to-be-detected object, based on a result of the comparison.