Interlaced LiDAR Scanning for Higher Resolution Motion Detection
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Solution Overview
Problem
Existing LIDAR systems face challenges in accurately determining the position and orientation of the light deflector, particularly under varying environmental conditions, which affects their ability to reliably sense and interpret the surroundings for autonomous vehicles.
Innovation Solution
The LIDAR system employs a processor to control the light deflector to scan with interlaced scan patterns, adjusting laser pulse frequency or tilt increments to enhance scan resolution and detect moving objects, using multiple laser beams and deflectors to improve scanning efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single scan pattern is used, then the scanning process is simple, but the scan resolution and ability to detect moving objects are insufficient
Solution Approach 1:
The patent divides the scanning process into multiple interlaced scan patterns (first scan pattern and second scan pattern) that are executed sequentially. Each scan pattern covers different portions of the field of view with different scan lines, allowing the system to achieve higher effective resolution by combining data from both patterns without requiring a single overly complex scan design.
Solution Approach 2:
The patent introduces dynamic adjustment mechanisms where the processor can selectively adjust laser pulse frequency or tilt increment based on detected conditions. This allows the scan resolution to be adaptively optimized for different scenarios (such as detecting moving objects) without permanently increasing system complexity.
2Measurement precision
If laser pulse frequency is increased to improve detection accuracy, then the scan resolution improves, but the energy consumption increases
Solution Approach 1:
The patent employs periodic scanning with alternating first and second scan patterns. By distributing laser pulses across multiple periodic scan cycles rather than concentrating them in a single high-frequency pattern, the system maintains detection accuracy while spreading energy consumption over time, reducing peak power requirements.
Solution Approach 2:
The patent allows dynamic adjustment of laser pulse frequency as a controllable parameter. The processor can selectively adjust the frequency based on operational needs, enabling the system to optimize between detection accuracy and energy consumption by lowering frequency when high resolution is not required.
3Measurement precision
If the field of view is scanned with high resolution, then the detection precision improves, but the scanning time increases
Solution Approach 1:
The patent segments the field of view into different regions covered by first and second scan patterns with different scan lines. This segmentation allows parallel or sequential scanning of different areas, effectively distributing the total scanning time while maintaining high resolution in each segment, thereby reducing overall scanning time compared to uniformly scanning the entire field at maximum resolution.
Solution Approach 2:
The patent implements variable scan resolution where different portions of the field of view are scanned at different resolutions. By applying high resolution scanning only where needed (partial action) rather than uniformly across the entire field, the system achieves high detection precision for critical areas while reducing total scanning time.
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 enhances the LIDAR system's ability to accurately detect and interpret objects in diverse conditions, providing precise positional and orientation data for improved navigation and obstacle detection in autonomous vehicles.
Implementation Method 1
measuring distances to objects by illuminating objects with light and measuring the reflected pulses with a sensor
Data Source
AI summary
A LIDAR system includes at least one light source; at least one deflector configured to scan light emitted by the at least one light source over a field of view of the LIDAR system; and at least one processor configured to cause the at least one deflector to scan the field of view of the LIDAR system with a first scan pattern including a first series of scan lines and subsequently with a second scan pattern including a second series of scan lines that are interlaced with the first series of scan lines to provide a single frame scan pattern, and analyze reflection signals associated with the single frame scan pattern to determine whether at least one target object present in the field of view of the LIDAR system is moving.