Vehicle Glazing Angular Correction for Behind-Windshield LiDAR
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Solution Overview
Problem
Existing LIDAR systems installed behind vehicle windshields face errors in position determination due to glass distortion, requiring costly and cumbersome calibration processes using specialized targets.
Innovation Solution
A method to calculate an angular correction map for LIDAR systems by determining local thickness and slopes of vehicle glazing, allowing for pre-installation calibration without emitting light waves, using common optical measurement devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If LIDAR is calibrated using fluorescent targets and light wave emission, then measurement precision is improved, but device complexity and loss of time increase
Solution Approach 1:
The patent extracts the calibration process from the LIDAR system itself, performing calibration measurements on the glazing independently before LIDAR installation. This separates the glazing characterization (using simple optical sensors) from the LIDAR operation, eliminating the need for complex fluorescent targets and dedicated calibration equipment while maintaining position determination accuracy through pre-computed correction maps
Solution Approach 2:
The patent performs glazing calibration measurements and computes correction maps before LIDAR installation. By预先 characterizing the glazing's optical properties and calculating angular shifts in advance, the system eliminates the need for post-installation calibration with complex equipment, reducing both device complexity and calibration time while preserving measurement precision
2Measurement precision
If LIDAR calibration is performed after installation using fluorescent targets, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent performs all necessary calibration measurements and computes correction maps during glazing manufacturing, before LIDAR installation. This preliminary characterization of the glazing's optical properties eliminates the need for time-consuming post-installation calibration procedures, reducing quality control time while maintaining position determination accuracy through pre-computed angular correction data
3Measurement precision
If specialized calibration equipment is used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the measurement function from complex specialized calibration equipment and implements it using simple optical sensors during glazing manufacturing. By separating glazing characterization from LIDAR calibration and using basic optical measurement tools to determine angular shifts, the system achieves the necessary measurement precision while dramatically reducing device complexity and eliminating dedicated calibration equipment
Solution Approach 2:
The patent makes the glazing self-characterizing by using its own geometric properties (thickness, slopes) to compute angular shifts through numerical processing. This self-service approach eliminates the need for external specialized calibration equipment, as the glazing's inherent characteristics are sufficient for generating correction maps when processed through the described computational method
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
Enables accurate LIDAR calibration before installation, eliminating the need for lengthy and costly post-installation processes and dedicated tools, ensuring precise object position estimation.
Implementation Method 1
Pour chaque point d'un ensemble de points du pare-brise : détermination d'une épaisseur locale du pare-brise en ledit point
Implementation Method 2
obtention, par traitement numérique, d'une pente locale horizontale et d'une pente locale verticale en ledit point, à partir de l'épaisseur locale en ledit point
Implementation Method 3
calcul d'un décalage angulaire vertical en fonction d'une composante verticale d'un angle d'émission d'une onde lumineuse destinée à traverser le pare-brise en ledit point, de la pente locale verticale en ledit point et de l'inclinaison du pare-brise
Data Source
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Figure 5
AI summary
One aspect of the invention relates to a method for analysing a glazing (201) for a correction intended to be used by a LIDAR (2020) configured to emit, according to a given angle of emission, light waves intended to pass through the glazing (201) of the vehicle, comprising the following steps: - for a plurality of points of the glazing (201): o obtaining a horizontal local slope and a vertical local slope at said point (2031); o computing a vertical angular offset (δv) and a horizontal angular offset as a function of a vertical component (αv) and of a horizontal component of the angle of emission of the light wave passing through the glazing (201) at said point, of the vertical local slope and of the horizontal local slope at said point and the inclination (θ) of the glazing (201); - establishing a map of angular corrections on the basis of the vertical angular offsets (δv) and of the horizontal angular offsets computed.