LiDAR Anti-Interference Ranging via Time-Slot Scheduling
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Solution Overview
Problem
Infrared ranging systems face reduced accuracy due to interference between multiple light detection and ranging devices, as their detection lights interfere with each other, leading to inaccurate detection data and reduced ranging precision.
Innovation Solution
An anti-interference ranging method and apparatus that detect interference between light detection processes in a ranging system by capturing environment images, calculating differences in grayscale values, or determining standard deviations of detection data, and delay the light detection process of affected devices until they are no longer interfered with, ensuring accurate data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple light detection and ranging devices operate simultaneously, then the detection speed and productivity of the system is improved, but the ranging accuracy deteriorates due to mutual interference between detection lights
Solution Approach 1:
The patent implements periodic time-slot allocation where each light detection and ranging device is assigned specific time windows for emission and detection. Devices operate in a cyclic manner, with device A emitting in time slot 1, device B in time slot 2, and so on. This periodic scheduling ensures that only one device emits detection light at any given moment, eliminating mutual interference while maintaining high system throughput through continuous cycling across multiple time slots.
Solution Approach 2:
The patent performs preliminary interference detection before the actual light detection process. Each device captures environment images and calculates grayscale value differences or standard deviations to predict potential interference from other devices. Based on this preliminary assessment, the system proactively adjusts detection timing or delays detection processes to avoid interference, ensuring accurate measurements before they are compromised.
2Measurement precision
If the light detection process is delayed to avoid interference, then the ranging accuracy is improved, but the detection time and productivity are reduced
Solution Approach 1:
The patent structures detection operations into periodic time slots where delays are predetermined and optimized. Rather than arbitrary delays, each device has pre-assigned detection windows that are periodically repeated. This ensures that delays are minimized to only what is necessary for interference avoidance, while the periodic nature maintains consistent throughput and prevents excessive waiting time across the system.
Solution Approach 2:
The patent performs preliminary interference detection using environment images and grayscale analysis before the actual light detection. This allows the system to identify interference conditions in advance and make proactive timing adjustments, avoiding unnecessary delays. Only when actual interference is detected does the system implement delays, ensuring that time loss is minimized while still achieving accurate measurements when needed.
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 improves the ranging accuracy of light detection and ranging devices by preventing interference, allowing for precise distance measurements by ensuring that detection data is collected without interference from other devices, thus enhancing the overall system's accuracy and reliability.
Implementation Method 1
a photoelectric detector in the light detection and ranging device receives the reflected detection light and performs photoelectric conversion on the received light signal
Data Source
AI summary
An anti-interference ranging method and an anti-interference ranging apparatus are provided. The method includes: detecting, by a first light detection and ranging device, whether a light detection process is interfered by a second light detection and ranging device in the ranging system; delaying, by the first light detection and ranging device, the light detection process for a preset time period if it is detected that the light detection process is interfered by the second light detection and ranging device; and acquiring, by the first light detection and ranging device, detection data collected in the light detection process, and processing, by the first light detection and ranging device, the detection data to obtain a ranging result if it is detected that the light detection process is not interfered by the second light detection and ranging device.