Interlaced LiDAR Scanning for Moving Object 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 traditional scanning patterns are used in LIDAR systems, then the system structure is simple, but the measurement precision and reliability of detecting objects under varying environmental conditions deteriorates
Solution Approach 1:
The scanning process is divided into multiple interleaved scan lines that are scanned in an alternating pattern. Instead of scanning all lines sequentially in one direction, the system scans odd lines in one direction and even lines in the opposite direction, segmenting the overall scanning task into smaller, manageable units that can be executed more efficiently and with better precision.
Solution Approach 2:
The LIDAR system employs periodic scanning patterns where the deflector oscillates back and forth in a regular cycle. This periodic action allows for consistent sampling intervals and enables the system to maintain measurement precision through regular, predictable scanning behavior that can be synchronized with the laser pulse frequency.
2Reliability
If the light deflector position and orientation are not precisely monitored, then the system complexity is reduced, but the reliability of determining surroundings deteriorates
Solution Approach 1:
The system incorporates feedback mechanisms where the actual position and orientation of the light deflector are continuously monitored and compared against the expected positions. This feedback information is used to correct any deviations and ensure accurate mapping between scanned points and their corresponding locations in the environment, thereby maintaining high reliability in surroundings detection.
Solution Approach 2:
The system performs preliminary calibration and characterization of the light deflector's movement characteristics before actual scanning operations. By pre-determining the relationship between deflector positions and scan line orientations, the system establishes a reference framework that enhances the reliability of subsequent measurements without requiring complex real-time monitoring during operation.
3Measurement precision
If scan resolution is increased to improve object detection, then the measurement precision improves, but the scanning time and productivity decrease
Solution Approach 1:
The system dynamically adjusts the scanning parameters including pulse frequency and deflector speed based on the required resolution and environmental conditions. By making the scanning process adaptive rather than static, the system can optimize the balance between resolution and speed, increasing resolution only when and where necessary rather than maintaining maximum resolution across all scanning operations.
Solution Approach 2:
The system changes operational parameters such as laser pulse frequency and deflector tilt increments to achieve the desired scan resolution. By adjusting these parameters dynamically based on detection requirements and environmental conditions, the system can maintain high measurement precision while avoiding the constant high-resolution scanning that would reduce productivity.
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
Enhances the LIDAR system's ability to accurately detect and interpret objects in diverse conditions, providing precise positioning and orientation data for improved navigation in autonomous vehicles.
Implementation Method 1
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
Implementation Method 2
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.