LiDAR Echo Signal Processing Using Multi-Threshold Comparison Units
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Solution Overview
Problem
Current LiDAR systems face limitations in ranging accuracy due to the low collection rate of echo signal features, as they typically convert echo signals into digital signals using only one threshold, which affects the processing efficiency and reliability of distance measurements.
Innovation Solution
The proposed LiDAR system employs multiple comparison units and timing units for each receiving unit, using multiple thresholds to convert echo signals into digital signals, allowing for the extraction of more abundant echo signal features, including distance information, ambient noise levels, and signal strength, which can be processed for noise reduction and emission power adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single threshold is used to convert echo signals into digital signals, then the device complexity is reduced, but the measurement precision and reliability of ranging are degraded
Solution Approach 1:
The patent divides the single comparison unit into multiple comparison units (first comparison unit, second comparison unit, etc.), each handling different threshold comparisons. This segmentation allows simultaneous extraction of multiple features (distance, noise level, signal strength) from the echo signal, improving measurement precision while maintaining manageable system complexity through modular design
Solution Approach 2:
The patent transitions from a single-threshold (one-dimensional) approach to a multi-threshold (multi-dimensional) approach. By introducing multiple thresholds with different values, the system extracts features across multiple dimensions, enabling comprehensive analysis of echo signal characteristics including distance information, ambient noise levels, and signal strength
2Reliability
If multiple thresholds are used to convert echo signals into digital signals, then the measurement precision and reliability are improved, but the device complexity increases
Solution Approach 1:
The patent segments the timing function into multiple independent timing units, each corresponding to a specific comparison unit and threshold level. This segmentation enables parallel processing of multiple digital signals, improving working reliability through redundant measurement paths while managing complexity through functional specialization
Solution Approach 2:
The patent implements feedback mechanisms where the processing unit receives multiple digital signals and timing results, processes them comprehensively, and uses the extracted features (noise levels, signal strength) to adjust system parameters. This feedback loop enhances working reliability by enabling adaptive noise reduction and emission power adjustment based on real-time echo signal analysis
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 approach improves the ranging accuracy and working reliability of LiDAR systems by enhancing the quality of point cloud data collection through more comprehensive echo signal processing.
Implementation Method 1
A LiDAR system is a system that emits a laser beam to detect characteristics such as position, speed, or the like of a target
Implementation Method 2
the received echo signal is an analog signal and needs to be first converted into a digital pulse signal before the time interval between the emitted signal and the echo signal can be calculated
Data Source
AI summary
Embodiments of this application disclose a LiDAR system, an echo signal processing method and apparatus, and an electronic device, pertaining to the field of LiDAR sensors. The system includes: M emission units, M receiving units, N×M comparison units. N×M timing units, and a processing unit. N is a positive integer greater than 1 and M is a positive integer greater than 0. The method includes: obtaining at least two digital signals and at least two timing results respectively corresponding to echo signals based on at least two thresholds, where the thresholds, the digital signals, and the timing results are in one-to-one correspondence; and processing the echo signal based on the at least two digital signals and the at least two timing results.