LiDAR Pixel Intensity Correction for Ranging Accuracy
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Solution Overview
Problem
Traditional LiDAR devices experience reduced ranging accuracy due to varying light intensities at different pixel positions in the receiving unit, leading to intensity drops at edge pixels of adjacent receiving units.
Innovation Solution
A ranging adjustment method for LiDAR devices that involves calibrating echo intensity at different pixel positions, determining correction coefficients, and performing echo intensity correction calculations to ensure consistent intensity data across pixels in the same receiving unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the laser spot irradiates the receiving unit, then the central pixels receive stronger energy, but the edge pixels receive relatively weaker energy causing intensity drop
Solution Approach 1:
The patent applies local quality by introducing position-dependent correction coefficients for pixels at different locations within receiving units. Each pixel group is assigned a specific correction coefficient based on its position (central vs. edge), allowing differential intensity compensation. This resolves the contradiction by maintaining uniform ranging accuracy across all pixel positions while preserving the natural Gaussian intensity distribution of the laser spot.
2Measurement precision
If echo intensity correction is performed using correction coefficients, then ranging accuracy is improved, but system complexity increases due to calibration and correction calculations
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing correction coefficients for each pixel group position before actual ranging operations. During calibration, the system establishes the relationship between pixel positions and correction coefficients once, then reuses these pre-computed values during normal operation. This approach significantly reduces real-time computational complexity while maintaining high ranging accuracy.
Solution Approach 2:
The patent introduces correction coefficients as an intermediary element that mediates between the raw echo intensity data and the final ranging results. These coefficients serve as a lookup table or correction layer that simplifies the complex intensity compensation process, transforming it into a straightforward multiplication operation rather than requiring complex real-time calculations.
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 improves ranging accuracy by ensuring consistent echo intensity data across pixels, allowing for more precise determination of distance information for measured objects.
Implementation Method 1
a laser emission module and a laser receiving module
Implementation Method 2
determining distance information of a to-be-measured object based on the correction intensity data
Implementation Method 3
the receiving unit including a pixel array... when the laser spot of the emission unit irradiates one of the receiving units
Data Source
AI summary
The present disclosure provides a LiDAR device and its ranging adjustment method. The ranging adjustment method involves first calibrating the echo intensities at different pixel positions in receiving units of the LiDAR device and then determining the corresponding correction coefficients. Based on these correction coefficients, the method corrects the intensity data output by the pixels at different positions, ensuring consistency in the intensity data output by the corresponding pixels of the same receiving unit.