LiDAR Emission Adjustment for Uniform Edge-to-Center Ranging
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Solution Overview
Problem
The non-uniform illuminance in the field of view of conventional LiDAR devices, particularly at the edge of the field of view, affects ranging accuracy due to vignetting and varying attenuation coefficients of receiving units, leading to inconsistent ranging capabilities.
Innovation Solution
A ranging adjustment method for LiDAR devices that involves calculating and adjusting the number of laser beam emissions and/or emission power based on the attenuation coefficients of receiving units, using a control circuit to ensure uniformity of ranging capabilities across the receiving array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If vignetting is applied to improve imaging quality in the edge field of view, then imaging quality is improved, but illuminance of the edge field of view is further reduced, affecting ranging accuracy
Solution Approach 1:
The patent applies different emission parameters to different emission units based on their spatial position. Edge emission units use higher emission parameters to compensate for lower illuminance, while central emission units use lower emission parameters. This local differentiation resolves the contradiction by ensuring uniform ranging capability across the entire field of view.
Solution Approach 2:
The patent dynamically adjusts emission parameters (such as laser pulse width, pulse amplitude, or repetition rate) for each emission unit based on pre-calculated attenuation coefficients. This parameter optimization ensures that all receiving units receive sufficient signal strength for accurate ranging, eliminating the impact of non-uniform illuminance.
2Area of stationary object
If the detection angle of view is increased, then the field of view is expanded, but the illuminance of the edge field of view is reduced
Solution Approach 1:
The patent divides the receiving array into multiple emission units corresponding to different spatial positions and applies different emission parameters to each unit. Edge units with lower illuminance receive higher emission parameters, while central units receive lower parameters, ensuring uniform ranging performance across the expanded field of view.
Solution Approach 2:
The patent pre-calculates attenuation coefficients for each receiving unit based on its position and optical characteristics before actual ranging operations. These pre-computed values are stored and used to determine appropriate emission parameters in advance, ensuring that when ranging occurs, the correct emission parameters are already ready to compensate for position-dependent illuminance variations.
3Measurement precision
If different emission parameters are applied to different emission units, then ranging uniformity is improved, but device complexity increases
Solution Approach 1:
The patent pre-calculates and stores attenuation coefficients for all receiving units in a lookup table before actual ranging operations. During ranging, the system only needs to query the appropriate attenuation coefficient based on the receiving unit's position, rather than performing complex real-time calculations. This preliminary computation significantly reduces control complexity while maintaining ranging uniformity.
Solution Approach 2:
The system uses the receiving unit's own position information and pre-stored attenuation coefficient to automatically determine the appropriate emission parameter. Each receiving unit essentially configures itself through the control circuit based on its position, eliminating the need for complex external control mechanisms or manual calibration for each unit.
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
Improves ranging accuracy and uniformity by optimizing the number of emissions and power for each receiving unit, ensuring consistent performance across the entire receiving array.
Implementation Method 1
a laser beam emission module (10) and a laser beam receiving module (20), the laser beam emission module (10) and the laser beam receiving module (20) are driven by a corresponding control circuit (30) to perform laser beam emission and reception work
Implementation Method 2
the laser beam is reflected by the object back to the laser beam receiving module (20), and the receiving unit receives the corresponding echo laser beam signal through the receiving lens
Data Source
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AI summary
The present invention proposes a LiDAR device and a ranging adjustment method of the same. According to the method, a position information of a receiving unit corresponding to a to-be-scanned emission unit is determined, and a table is queried based on the position information, to determine an attenuation coefficient of the receiving unit; a number of required laser beam emissions and/or an emission power is calculated based on the attenuation coefficient, and laser beam emission and reception work is performed based on the number of laser beam emissions and/or the emission power; and a corresponding histogram data is obtained based on the number of echo superimpositions of the corresponding histogram, a distance information of the to-be-detected object is determined based on the histogram data, and the number of laser beam emissions and/or the emission power of the emission unit corresponding to the receiving unit at the corresponding position is adjusted, so that ranging accuracy and a ranging capability are improved and the entire receiving array has the same ranging capability, thereby improving uniformity of ranging capabilities.