LiDAR Anti-Interference via Pseudo-Random Emission Timing
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Solution Overview
Problem
Multiple LiDARs conducting simultaneous detection often interfere with each other, leading to affected point cloud data and reduced detection accuracy.
Innovation Solution
A laser detection method that uses a pseudo-random number generator and a true random number generator to determine random emission times for LiDARs, minimizing overlap in flight times and enhancing anti-interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple LiDARs conduct detection simultaneously, then detection coverage and efficiency are improved, but mutual interference occurs leading to reduced detection accuracy
Solution Approach 1:
The patent applies periodic action by using pseudo-random code sequences with specific periods for laser emission timing. Each LiDAR emits laser pulses according to a periodic pseudo-random sequence, creating a structured temporal pattern that allows receivers to distinguish between different LiDAR sources through correlation processing, thereby enabling simultaneous operation without mutual interference
Solution Approach 2:
The patent changes the temporal parameter of laser emission by introducing pseudo-random delay periods to the emission timing. Instead of uniform periodic emission, each LiDAR uses a unique pseudo-random sequence to vary its emission timing parameters, allowing multiple LiDARs to operate simultaneously while maintaining distinguishable signal characteristics for accurate detection
2Area of stationary object
If multiple LiDARs conduct detection simultaneously, then detection coverage is improved, but point cloud data quality deteriorates due to interference
Solution Approach 1:
The patent implements feedback through correlation processing where the received echo signals are correlated with the known pseudo-random code sequences. This feedback mechanism allows the system to identify and extract valid echo signals from the correct LiDAR while filtering out interference from other LiDARs, thereby maintaining high point cloud data quality across extended detection coverage areas
3Device complexity
If fixed emission times are used for LiDAR, then system simplicity is maintained, but interference between multiple LiDARs increases
Solution Approach 1:
The patent introduces pseudo-random code sequences as an intermediary element between the LiDAR emission and reception processes. These code sequences act as unique identifiers for each LiDAR, allowing the system to distinguish between different sources without requiring complex hardware modifications, thus reducing mutual interference while maintaining relative system simplicity
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 method significantly improves the anti-interference effect of LiDARs, resulting in enhanced detection accuracy and reduced mutual interference between multiple LiDARs.
Implementation Method 1
emit a detection laser at the target, then compare the received echo signal reflected from the target with the emitted signal
Implementation Method 2
obtain relevant information about the target, such as distance, azimuth, altitude, speed, attitude, and even shape
Data Source
AI summary
This application provides a laser detection method and device, applied to LiDAR. The LiDAR includes a first emitting unit, and the laser detection method includes: obtaining a random variable; determining a plurality of first emission times according to the random variable; and controlling the first emitting unit to emit a laser signal at the plurality of first emission times.