Dynamic Composite Field of View for Lidar Noise Reduction
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Solution Overview
Problem
Lidar systems face challenges in maintaining accuracy and reducing noise when scanning a light beam across a target region, particularly when the target spans multiple detector pixels or changes direction, leading to reduced signal quality and increased susceptibility to spurious signals.
Innovation Solution
A method and system for dynamically adjusting the composite field of view by selecting and summing detector pixels, allowing for real-time adjustment of the light beam's angle and pixel selection to align with the target's position and size, thereby optimizing the detection area and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light beam scans across the target region using a fixed field of view, then the system can detect light reflected from the target, but the signal-to-noise ratio decreases when the target spans multiple detector pixels or changes direction
Solution Approach 1:
The patent implements dynamic adjustment of the composite field of view by selectively activating different groups of detector pixels based on the real-time position and orientation of the target. The system transitions from a static field of view to a dynamic one that adapts to target movement, thereby maintaining optimal signal-to-noise ratio throughout the scanning process.
Solution Approach 2:
The patent applies local quality by concentrating the detection resources (detector pixels) on the specific region where the target is located. Instead of using all detector pixels uniformly, the system selectively activates only the necessary subset of pixels that correspond to the target's current position, thereby improving signal-to-noise ratio while reducing noise from inactive regions.
2Measurement precision
If the system uses all N detector pixels to scan the target region, then complete coverage is achieved, but noise increases and signal quality decreases
Solution Approach 1:
The patent extracts only the necessary subset of detector pixels needed to detect the target at its current position and orientation. By removing unnecessary pixels from the active detection group, the system reduces noise while maintaining complete target coverage. This extraction principle is applied dynamically as the target moves throughout the scanning process.
3Measurement precision
If the composite field of view is adjusted to match the target position and size, then signal-to-noise ratio improves, but device complexity increases due to dynamic pixel selection
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the relationships between target positions, orientations, and the corresponding optimal detector pixel groups. During scanning, the system simply retrieves the appropriate pixel group based on the current target state rather than performing complex real-time calculations, thereby reducing device complexity while maintaining high signal-to-noise ratio.
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 signal-to-noise ratio, improves target tracking, and reduces noise by dynamically adjusting the composite field of view to match the target's position and size, ensuring accurate detection and reduced susceptibility to spurious signals.
Implementation Method 1
a photosensitive detector... for detecting a portion of light beam transmitted towards a target region
Data Source
AI summary
A system and method for providing a dynamic composite field of view in a scanning lidar system, such as to improve a signal-to-noise ration of detected light. The dynamic composite field of view can include a subset of the available detector pixels, and can thereby reduce noise introduce by noise sources that can scale with a detector area, such as dark current and gain peaking that can be caused by a capacitance of the photodetector.