LIDAR Inclination Compensation for Reliable Road Obstacle Detection
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Solution Overview
Problem
Existing LIDAR systems face challenges in securing a wide vertical field of view and ensuring reliable obstacle detection due to limitations in laser diode channels and varying vehicle inclinations relative to the road, leading to inaccurate obstacle determination.
Innovation Solution
A LIDAR signal processing apparatus that calculates and compensates for vehicle inclinations by deriving flight lengths and estimating vertical and horizontal inclinations, determining information reliability based on these measurements, and processing only valid data to enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple laser diodes or prism optical system are used to extend vertical field of view, then vertical field of view is improved, but device complexity increases
Solution Approach 1:
The single laser diode is made multi-functional by mechanically tilting it to different angles to emit laser beams in different vertical directions. Instead of using multiple laser diodes or complex prism systems, one laser diode performs multiple functions by changing its emission angle through mechanical tilting, thereby simplifying the device structure while maintaining wide vertical field of view coverage
Solution Approach 2:
The laser diode is made dynamically adjustable through mechanical tilting mechanisms that allow real-time change of emission angles. This dynamic adjustment enables a single static component (laser diode) to achieve dynamic multi-directional coverage, replacing the need for multiple fixed laser diodes or complex optical systems
2Area of stationary object
If separate channel laser diode with vertical inclination is employed to secure vertical field of view, then vertical field of view is improved, but reliability of obstacle detection deteriorates due to varying vehicle inclinations
Solution Approach 1:
An inclination sensor is introduced to detect the actual inclination angle of the vehicle in real-time. This feedback information is used to dynamically adjust the laser beam emission angle, compensating for vehicle inclinations caused by obstacles like stones, slopes, or potholes. The system continuously monitors and adjusts based on actual conditions, ensuring reliable obstacle detection regardless of vehicle inclination variations
Solution Approach 2:
The emission angle parameter of the laser beam is dynamically changed based on the detected vehicle inclination angle. When the vehicle encounters an obstacle causing inclination, the system adjusts the laser emission angle to compensate for the tilt, maintaining accurate obstacle detection capability across varying road conditions
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
Ensures reliable obstacle detection by correcting for vehicle inclinations in real-time, improving the accuracy and reliability of LIDAR data processing.
Implementation Method 1
a sensor configured to emit first laser light toward a road on which a vehicle is present and configured to receive a reflection wave
Implementation Method 2
a flight length deriving unit configured to derive a flight length of first laser light emitted from a sensor
Data Source
AI summary
A light detection and ranging (LIDAR) signal processing apparatus capable of accurately measuring a distance to an object using an optical means may include: a flight length deriving unit to calculate a flight length of a first laser light emitted from a sensor toward a road with an inclination, a vertical inclination measurement unit to estimate a vertical inclination of the vehicle with respect to the road based on the flight length, a horizontal inclination measurement unit to estimate a horizontal inclination of the vehicle with respect to the road based on the flight length, a reliability determination unit to determine reliability of information detected by the sensor based on the vertical inclination and the horizontal inclination of the vehicle, and a data processing unit to process the detected information when the detected information is reliable.