LiDAR Scanning Mode Switching for High-Reflectivity Crosstalk
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Solution Overview
Problem
Inaccurate measurement results caused by crosstalk among receiving units in a receiving array due to high energy of echo signals reflected by target objects with high reflectivity in lidar systems.
Innovation Solution
Implementing a lidar control method that switches between a first and second preset scanning mode to collect echo data, with the second mode addressing oversaturated regions independently, followed by data fusion to eliminate crosstalk and improve measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single scanning mode is used to measure all regions, then the measurement process is simple and fast, but measurement accuracy deteriorates due to signal crosstalk from high reflectivity objects
Solution Approach 1:
The scanning process is divided into two distinct scanning modes: a first scanning mode for general regions and a second scanning mode for oversaturated regions. This segmentation allows each mode to be optimized for its specific purpose, with the second mode using independent detection to eliminate crosstalk interference from high reflectivity objects.
Solution Approach 2:
Different scanning strategies are applied to different spatial regions based on their reflectivity characteristics. Ordinary regions are measured using the first scanning mode, while identified oversaturated regions are measured using the second scanning mode with independent detection, ensuring each region receives the appropriate measurement quality.
2Measurement precision
If independent detection is used for oversaturated regions, then signal crosstalk is eliminated, but detection time increases due to separate measurement processes
Solution Approach 1:
The system first performs a quick scan using the first scanning mode to identify oversaturated regions. Only after identifying these regions does it apply the second scanning mode with independent detection. This preliminary action approach ensures that the time-consuming independent detection is performed only where necessary, not across the entire field of view.
Solution Approach 2:
Instead of applying the resource-intensive second scanning mode to all regions, the system applies it only partially to the specific oversaturated regions that were identified. This partial action approach maintains signal accuracy for problematic regions while minimizing the overall time penalty.
3Measurement precision
If data fusion from multiple scanning modes is performed, then measurement accuracy is improved, but data processing complexity increases
Solution Approach 1:
The system extracts data from oversaturated regions using the second scanning mode with independent detection, separating this data from the general measurement data. This extraction allows the data fusion process to focus on combining specific subsets of data (first echo data and second echo data for identified regions) rather than processing all data uniformly, reducing overall processing complexity.
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
Effectively eliminates signal crosstalk from high reflectivity objects, enhancing measurement accuracy by using data fusion of echo data from different scanning modes.
Implementation Method 1
When a laser emitted by the LIDAR detects a target object with high reflectivity, energy of echo signals reflected by the target object with the high reflectivity is relatively high
Data Source
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AI summary
The present application is applicable to the technical field of a lidar, and provides a lidar control method, a terminal apparatus, and a computer-readable storage medium. The lidar control method includes the following steps: acquiring first echo data; when an oversaturated region is determined according to the first echo data, controlling LIDAR to measure a scanning region according to a second preset scanning mode to obtain second echo data; performing data fusion based on the first echo data and the second echo data to obtain target data. The LIDAR is controlled to measure according to a first preset scanning mode and the second preset scanning mode, and then data fusion is performed based on the measured first echo data and second echo data, thereby effectively eliminating a problem of signal crosstalk caused by too high reflection energy of an object with high reflectivity, and effectively improving measurement accuracy.