LiDAR Road Line Measurement Range for Accurate Vehicle Positioning
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Solution Overview
Problem
The accuracy of estimating a vehicle's position using white lines detected by LiDAR is affected by the type and condition of the lines, leading to varying detection accuracy due to differences in the amount of data used, which can result in inconsistent positioning estimates.
Innovation Solution
A measurement device and method that acquires data from sensors detecting road surface lines, determines a predetermined range based on the vehicle's position and positional information of broken-line type road surface lines, and extracts and processes data within this range to improve detection accuracy, considering curvature and line type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed detection range is used for all road surface lines, then the device complexity is reduced, but the measurement precision deteriorates because detection accuracy varies with line type and condition
Solution Approach 1:
The patent applies dynamics by making the detection range adjustable rather than fixed. The determination unit dynamically sets the detection range based on the type of road surface line (continuous or broken) and the amount of LiDAR data available. This allows the system to adapt the detection parameters to match the actual road conditions, thereby maintaining high measurement precision without requiring overly complex manual configuration
Solution Approach 2:
The patent changes the detection range parameter according to the line type and data quantity. When broken lines are detected or data quantity is insufficient, the determination unit expands the detection range to ensure enough features are captured for accurate position estimation. This parameter adjustment resolves the contradiction by optimizing detection accuracy for different scenarios
2Measurement precision
If the detection range is expanded to capture more data, then the measurement precision improves, but the loss of information increases due to including irrelevant or noisy data from areas beyond the necessary detection zone
Solution Approach 1:
The patent applies local quality by setting different detection ranges for different regions based on the specific road line characteristics. Rather than uniformly expanding the detection range across all areas, the determination unit selectively adjusts the range only where needed to capture sufficient broken line segments or curved line features, while maintaining a tighter range in areas with clear continuous lines. This ensures high measurement precision without unnecessarily including noisy data from irrelevant areas
3Productivity
If the detection range is reduced to process less data, then the productivity increases, but the measurement precision deteriorates when insufficient data is available for accurate position estimation
Solution Approach 1:
The patent applies partial or excessive action by dynamically adjusting the detection range to capture just enough data for accurate position estimation. When road lines are clear and continuous, the determination unit reduces the detection range to process only necessary data, improving productivity. When broken lines or curves are present, the range is expanded to ensure sufficient data points are captured, maintaining measurement precision. This adaptive approach balances processing efficiency with accuracy requirements
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 allows for appropriate adjustment of detection ranges for broken-line and curved road surface lines, enhancing the accuracy of vehicle positioning by ensuring sufficient data is captured for precise estimation, regardless of line type or condition.
Implementation Method 1
a sensor unit for detecting road surface lines around... output data from a sensor unit for detecting road surface lines around... Patent Reference 2 discloses a technique of transmitting an electromagnetic wave to a road surface and detecting white lines based on its reflectivity
Data Source
AI summary
The measurement device acquires output data from a sensor unit for detecting road surface lines around, and determines a predetermined range based on an own position and positional information of broken-line type road surface lines. Then, the measurement device extract, from the output data, data corresponding to detection result of the predetermined range, and executes predetermined processing based on the extracted data.