LiDAR Delay Generating Unit Dead Zone Reduction
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Solution Overview
Problem
LiDAR devices face challenges in detecting objects within a certain range due to the arrangement of transmission and reception modules, leading to increased minimum measurement distance and dead zones, and the performance of distance resolution is affected by the preset clock resolution.
Innovation Solution
A LiDAR device design incorporating a transmission module with an emitter array and a reception module with a detector array, featuring a sub-optic unit that diffuses a portion of the laser and a delay generating unit that applies different delay values to cycles for improved distance measurement using histogram data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a bi-axial LiDAR device uses a conventional arrangement of transmission and reception modules, then the device structure is simple, but the minimum measurement distance increases and dead zones are created
Solution Approach 1:
The patent divides the LiDAR device into separate transmission and reception modules with independent optical paths. The transmission module emits laser beams while the reception module detects reflected light, allowing spatial separation that eliminates dead zones and reduces minimum measurement distance without significantly increasing overall device complexity.
Solution Approach 2:
The patent implements a bi-axial configuration where the transmission and reception modules are arranged in different spatial dimensions and orientations. This dimensional separation allows simultaneous transmission and reception without interference, eliminating the dead zone problem while maintaining structural simplicity.
2Measurement precision
If the resolution of preset clock is increased to improve distance resolution, then distance measurement precision improves, but the amount of histogram data increases
Solution Approach 1:
The patent applies partial action by using multiple preset clocks with different resolutions for different measurement requirements. Instead of using a single high-resolution clock that generates excessive data, the system selectively applies appropriate clock resolutions based on the specific measurement needs, reducing histogram data volume while maintaining necessary distance resolution.
Solution Approach 2:
The patent changes the parameter of clock resolution dynamically by employing multiple preset clocks with varying resolutions. This allows the system to adjust the data generation rate according to measurement requirements, achieving high distance resolution when needed while minimizing histogram data volume during normal operation.
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 minimizes dead zones and enhances distance resolution beyond that of the preset clock, enabling more accurate and efficient distance measurement in LiDAR devices.
Implementation Method 1
a sub-optic unit disposed on an optical path through which a first laser emitted from the first emitting unit is guided by the first optic unit, wherein the sub-optic unit includes a diffuser configured to diffuse at least a portion of the first laser
Data Source
AI summary
A Light Detection and Ranging (LiDAR) device comprising: a laser detecting array including a first detecting unit, a delay generating unit configured to obtain a detection signal from the first detecting unit and output a delay signal, a signal detecting unit configured to detect the delay signal outputted from the delay generating unit using a preset clock, a memory unit configured to store a histogram data based on a detection result by the signal detecting unit and a data processing unit for calculating a distance value for the first detecting unit based on the histogram data stored in the memory unit, wherein the delay generating unit applies a first delay value for a first detecting cycle, and applies a second delay value for a second detecting cycle, wherein the first delay value and the second delay value are different from each other.