Time-Multiplexed Lidar Resolution via Segmented Emission
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Solution Overview
Problem
Existing lidar distance measurement methods suffer from low resolution, particularly in long-distance detection, due to environmental and other factor influences.
Innovation Solution
A detection device and method utilizing a light emitting module with M emitting regions and a light receiving module with N receiving regions, where the emitting regions output light in a specific order, allowing the receiving module to receive and process reflected light information to generate a distance image with a resolution not lower than N and not exceeding N×M, thereby improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of receiving regions is increased to improve measurement precision, then the device complexity and size increase
Solution Approach 1:
The light emitting module is divided into M emitting regions that can be independently controlled, allowing sequential emission to different spatial zones. This segmentation enables the system to achieve higher measurement precision by combining information from M×N total emission-reception events, effectively multiplying the resolution capability without requiring M×N physical receiving elements.
Solution Approach 2:
The patent introduces a temporal dimension to the detection process by sequentially activating different emitting regions over time. The processing module reconstructs high-resolution distance images by combining spatial information from N receiving regions with temporal information from M sequential emission cycles, achieving M×N effective resolution through time-multiplexed measurement.
2Measurement precision
If the number of receiving regions is increased to improve measurement precision, then the device size increases
Solution Approach 1:
The light emitting module is divided into M emitting regions that can be independently controlled, allowing sequential emission to different spatial zones. This segmentation enables the system to achieve higher measurement precision by combining information from M×N total emission-reception events, effectively multiplying the resolution capability without requiring M×N physical receiving elements.
Solution Approach 2:
The system performs periodic emission cycles where each cycle activates a specific emitting region in sequence. Over M cycles, all emitting regions are activated systematically, allowing the N receiving regions to collect comprehensive spatial information that is then reconstructed into a high-resolution M×N distance image through temporal processing.
3Measurement precision
If sequential emission from M emitting regions is implemented to improve resolution, then the detection time increases
Solution Approach 1:
The system performs periodic emission cycles where each cycle activates a specific emitting region in sequence. Over M cycles, all emitting regions are activated systematically, allowing the N receiving regions to collect comprehensive spatial information that is then reconstructed into a high-resolution M×N distance image through temporal processing.
Solution Approach 2:
The processing module is pre-configured with the emission sequence mapping between M emitting regions and N receiving regions. This preliminary setup allows for real-time reconstruction of M×N resolution distance images from the collected temporal data without requiring complex post-processing, thereby minimizing the time penalty associated with sequential measurement.
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
The solution enhances the accuracy of lidar distance measurement by achieving an image resolution higher than the number of receiving regions, improving the detection device's performance in both long-distance and short-range applications without increasing size or adding components.
Implementation Method 1
receive, by the N receiving regions, reflected light information of the emitted light emitted by the M emitting regions that is reflected from a detected target
Implementation Method 2
the distance to the target is obtained by detecting the flight (round-trip) time of the light pulse
Data Source
AI summary
Provided are a detection apparatus and method. The detection apparatus comprises a light emitting module, a processing module and a light receiving module, the light emitting module comprises M emitting regions; the light receiving module comprises N receiving regions; M and N are both integers greater than zero; the M emitting regions output M paths of emitted light in a time-sharing manner; the N receiving regions receive reflected light information emitted by M emitting regions and reflected by a detection target in a time-sharing manner, and send the reflected light information and receiving time corresponding to the reflected light information to the processing module; and the processing module processes the received reflected light information, to synthesize a distance image with the image resolution not being less than the number N of receiving regions and not being greater than the product N×M of the receiving regions and the emitting regions.